* installing to library ‘/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages’
* installing *source* package ‘NUSS’ ...
** package ‘NUSS’ successfully unpacked and MD5 sums checked
** using staged installation
** libs
using C++ compiler: ‘g++-14 (Debian 14.2.0-8) 14.2.0’
make[1]: Entering directory '/home/hornik/tmp/scratch/Rtmp94hd5H/R.INSTALLd099198c7c87/NUSS/src'
g++-14 -std=gnu++17 -I"/home/hornik/tmp/R.check/r-release-gcc/Work/build/include" -DNDEBUG  -I'/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include' -I'/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/Rcpp/include' -I/usr/local/include -D_FORTIFY_SOURCE=3   -fpic  -g -O2 -Wall -pedantic -mtune=native   -c RcppExports.cpp -o RcppExports.o
g++-14 -std=gnu++17 -I"/home/hornik/tmp/R.check/r-release-gcc/Work/build/include" -DNDEBUG  -I'/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include' -I'/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/Rcpp/include' -I/usr/local/include -D_FORTIFY_SOURCE=3   -fpic  -g -O2 -Wall -pedantic -mtune=native   -c internal_unigram_sequence_segmentation.cpp -o internal_unigram_sequence_segmentation.o
In file included from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/aux_/na_assert.hpp:23,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/arg.hpp:25,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/placeholders.hpp:24,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/iterator/iterator_categories.hpp:16,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/iterator/iterator_facade.hpp:13,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/iterator_range_core.hpp:27,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/iterator_range.hpp:13,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/as_literal.hpp:18,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string/predicate.hpp:20,
                 from internal_unigram_sequence_segmentation.cpp:4:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/assert.hpp:194:21: warning: unnecessary parentheses in declaration of ‘assert_arg’ [-Wparentheses]
  194 | failed ************ (Pred::************
      |                     ^~~~~~~~~~~~~~~~~~~
  195 |       assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  196 |     );
      |     ~                
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/assert.hpp:194:21: note: remove parentheses
  194 | failed ************ (Pred::************
      |                     ^~~~~~~~~~~~~~~~~~~
      |                     -
  195 |       assert_arg( void (*)(Pred), typename assert_arg_pred<Pred>::type )
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  196 |     );
      |     ~                
      |     -
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/assert.hpp:199:21: warning: unnecessary parentheses in declaration of ‘assert_not_arg’ [-Wparentheses]
  199 | failed ************ (boost::mpl::not_<Pred>::************
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  200 |       assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  201 |     );
      |     ~                
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mpl/assert.hpp:199:21: note: remove parentheses
  199 | failed ************ (boost::mpl::not_<Pred>::************
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                     -
  200 |       assert_not_arg( void (*)(Pred), typename assert_arg_pred_not<Pred>::type )
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  201 |     );
      |     ~                
      |     -
In file included from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/bind/mem_fn.hpp:23,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/mem_fn.hpp:22,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/function/function_template.hpp:16,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/function.hpp:16,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string/detail/find_iterator.hpp:18,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string/find_iterator.hpp:24,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string/iter_find.hpp:27,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string/split.hpp:16,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/algorithm/string.hpp:23,
                 from internal_unigram_sequence_segmentation.cpp:5:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/get_pointer.hpp:48:40: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
   48 | template<class T> T * get_pointer(std::auto_ptr<T> const& p)
      |                                        ^~~~~~~~
In file included from /usr/include/c++/14/memory:78,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/function/function_base.hpp:23,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/function/function_template.hpp:14:
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
In file included from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:17,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/shared_ptr.hpp:17,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/detail/detail_fwd.hpp:23,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_primitives.hpp:21,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/xpressive_static.hpp:24,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/xpressive.hpp:18,
                 from internal_unigram_sequence_segmentation.cpp:6:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/detail/shared_count.hpp:326:33: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  326 |     explicit shared_count( std::auto_ptr<Y> & r ): pi_( new sp_counted_impl_p<Y>( r.get() ) )
      |                                 ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:354:31: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  354 |     explicit shared_ptr( std::auto_ptr<Y> & r ): px(r.get()), pn()
      |                               ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:365:22: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  365 |     shared_ptr( std::auto_ptr<Y> && r ): px(r.get()), pn()
      |                      ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:423:34: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  423 |     shared_ptr & operator=( std::auto_ptr<Y> & r )
      |                                  ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:430:34: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  430 |     shared_ptr & operator=( std::auto_ptr<Y> && r )
      |                                  ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp: In member function ‘boost::shared_ptr<T>& boost::shared_ptr<T>::operator=(std::auto_ptr<_Up>&&)’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/smart_ptr/shared_ptr.hpp:432:38: warning: ‘template<class> class std::auto_ptr’ is deprecated: use 'std::unique_ptr' instead [-Wdeprecated-declarations]
  432 |         this_type( static_cast< std::auto_ptr<Y> && >( r ) ).swap( *this );
      |                                      ^~~~~~~~
/usr/include/c++/14/bits/unique_ptr.h:59:28: note: declared here
   59 |   template<typename> class auto_ptr;
      |                            ^~~~~~~~
In file included from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/assert.hpp:35,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:20,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:19,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size_type.hpp:20,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size.hpp:21,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/functions.hpp:20,
                 from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/iterator_range_core.hpp:38:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5:   required from ‘struct boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:125:16:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  125 |         struct IncrementableIteratorConcept : CopyConstructible<Iterator>
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
In file included from /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:31:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5:   required from ‘struct boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/iterator/iterator_concepts.hpp:114:7:   [ skipping 19 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/iterator/iterator_concepts.hpp:114:7:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::Convertible<X, Y>::~Convertible() [with X = boost::iterators::random_access_traversal_tag; Y = boost::iterators::incrementable_traversal_tag]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  208 |     BOOST_CONCEPT_USAGE(Convertible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5:   required from ‘struct boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5:   required from ‘struct boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:152:13:   [ skipping 18 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:152:13:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:278:9:   [ skipping 13 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::Convertible<X, Y>::~Convertible() [with X = boost::iterators::random_access_traversal_tag; Y = boost::iterators::single_pass_traversal_tag]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  208 |     BOOST_CONCEPT_USAGE(Convertible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:278:9:   [ skipping 13 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:278:9:   required from ‘struct boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size.hpp:62:9:   [ skipping 8 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::SinglePassIteratorConcept<Iterator>::~SinglePassIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  158 |             BOOST_CONCEPT_USAGE(SinglePassIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5:   required from ‘struct boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:125:16:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  125 |         struct IncrementableIteratorConcept : CopyConstructible<Iterator>
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5:   required from ‘struct boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:281:9:   [ skipping 13 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:281:9:   required from ‘struct boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size.hpp:62:9:   [ skipping 8 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::SinglePassIteratorConcept<Iterator>::~SinglePassIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  158 |             BOOST_CONCEPT_USAGE(SinglePassIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:284:9:   required from ‘struct boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   required from ‘struct boost::concepts::requirement_<void (*)(boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >)>’
   72 | struct requirement_<void(*)(Model)>
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size.hpp:62:9:   [ skipping 8 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:5: note: in a call to non-static member function ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |     ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp: In instantiation of ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/size.hpp:62:9:   required from ‘typename boost::range_size<const SinglePassRange>::type boost::size(const SinglePassRange&) [with SinglePassRange = std::__cxx11::basic_string<char>; typename range_size<const SinglePassRange>::type = long unsigned int]’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/detail/core/matcher/string_matcher.hpp:84:31:   required from ‘boost::xpressive::detail::width boost::xpressive::detail::string_matcher<Traits, ICase>::get_width() const [with Traits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; ICase = mpl_::bool_<true>]’
   84 |             return boost::size(this->str_);
      |                    ~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/detail/dynamic/sequence.hpp:43:39:   required from ‘boost::xpressive::detail::sequence<BidiIter>::sequence(const boost::intrusive_ptr<boost::xpressive::detail::dynamic_xpression<Matcher, BidiIter> >&) [with Matcher = boost::xpressive::detail::string_matcher<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >, mpl_::bool_<true> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   43 |       , width_(xpr->Matcher::get_width())
      |                ~~~~~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/detail/dynamic/dynamic.hpp:165:12:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::detail::make_dynamic(const Matcher&) [with BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; Matcher = string_matcher<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >, mpl_::bool_<true> >]’
  165 |     return sequence<BidiIter>(xpr);
      |            ^~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/detail/dynamic/parser.hpp:128:38:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::detail::make_literal_xpression(const typename Traits::string_type&, boost::xpressive::regex_constants::syntax_option_type, const Traits&) [with BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; Traits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; typename Traits::string_type = std::__cxx11::basic_string<char>]’
  128 |         return make_dynamic<BidiIter>(matcher);
      |                ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:499:13:   [ skipping 3 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47: warning: ‘this’ pointer is null [-Wnonnull]
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::SinglePassRangeConcept<T>::~SinglePassRangeConcept() [with T = std::__cxx11::basic_string<char>]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:284:9: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  284 |         BOOST_CONCEPT_USAGE(SinglePassRangeConcept)
      |         ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5:   required from ‘struct boost::CopyConstructible<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:125:16:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  125 |         struct IncrementableIteratorConcept : CopyConstructible<Iterator>
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   [ skipping 16 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::CopyConstructible<TT>::~CopyConstructible() [with TT = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  167 |     BOOST_CONCEPT_USAGE(CopyConstructible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5:   required from ‘struct boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag>]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::incrementable_traversal_tag> >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 20 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::Convertible<X, Y>::~Convertible() [with X = boost::iterators::random_access_traversal_tag; Y = boost::iterators::incrementable_traversal_tag]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  208 |     BOOST_CONCEPT_USAGE(Convertible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::IncrementableIteratorConcept<Iterator>::~IncrementableIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  136 |             BOOST_CONCEPT_USAGE(IncrementableIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5:   required from ‘struct boost::EqualityComparable<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::EqualityComparable<TT>::~EqualityComparable() [with TT = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  233 |     BOOST_CONCEPT_USAGE(EqualityComparable) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5:   required from ‘struct boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag>]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::Convertible<boost::iterators::random_access_traversal_tag, boost::iterators::single_pass_traversal_tag> >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 19 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::Convertible<X, Y>::~Convertible() [with X = boost::iterators::random_access_traversal_tag; Y = boost::iterators::single_pass_traversal_tag]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:208:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  208 |     BOOST_CONCEPT_USAGE(Convertible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::SinglePassIteratorConcept<Iterator>::~SinglePassIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  158 |             BOOST_CONCEPT_USAGE(SinglePassIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5:   required from ‘struct boost::CopyConstructible<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:125:16:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  125 |         struct IncrementableIteratorConcept : CopyConstructible<Iterator>
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   [ skipping 16 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::CopyConstructible<TT>::~CopyConstructible() [with TT = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:167:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  167 |     BOOST_CONCEPT_USAGE(CopyConstructible) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13:   required from ‘struct boost::range_detail::IncrementableIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::IncrementableIteratorConcept<Iterator>::~IncrementableIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:136:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  136 |             BOOST_CONCEPT_USAGE(IncrementableIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5:   required from ‘struct boost::EqualityComparable<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:147:16:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
  147 |         struct SinglePassIteratorConcept
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   [ skipping 15 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::EqualityComparable<TT>::~EqualityComparable() [with TT = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept_check.hpp:233:5: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  233 |     BOOST_CONCEPT_USAGE(EqualityComparable) {
      |     ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13:   required from ‘struct boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::range_detail::SinglePassIteratorConcept<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 14 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::range_detail::SinglePassIteratorConcept<Iterator>::~SinglePassIteratorConcept() [with Iterator = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:158:13: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  158 |             BOOST_CONCEPT_USAGE(SinglePassIteratorConcept)
      |             ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp: In instantiation of ‘boost::concepts::usage_requirements<Model>::~usage_requirements() [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’:
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:50:47:   required from ‘static void boost::concepts::requirement<boost::concepts::failed************ Model::************>::failed() [with Model = boost::concepts::usage_requirements<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >]’
   50 |     static void failed() { ((Model*)0)->~Model(); }
      |                            ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:284:9:   required from ‘struct boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >’
   92 |     &::boost::concepts::requirement_<ModelFnPtr>::failed>    \
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:32:62:   required by substitution of ‘template<class Model> boost::concepts::detail::yes boost::concepts::detail::has_constraints_(Model*, wrap_constraints<Model, (& Model::constraints)>*) [with Model = boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> >]’
   32 |   inline yes has_constraints_(Model*, wrap_constraints<Model,&Model::constraints>* = 0);
      |                                                              ^~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:42:5:   required from ‘const bool boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >::value’
   44 |       , value = sizeof( detail::has_constraints_((Model*)0) ) == sizeof(detail::yes) );
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/has_constraints.hpp:45:51:   required from ‘struct boost::concepts::not_satisfied<boost::SinglePassRangeConcept<std::__cxx11::basic_string<char> > >’
   45 |     typedef boost::integral_constant<bool, value> type;
      |                                                   ^~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/detail/general.hpp:72:8:   [ skipping 9 instantiation contexts, use -ftemplate-backtrace-limit=0 to disable ]
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:282:39:   required from ‘boost::xpressive::detail::sequence<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::parse_alternates(FwdIter&, FwdIter) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >]’
  282 |             seq = this->parse_sequence(tmp, end);
      |                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:213:64:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile_(FwdIter, FwdIter, flag_type, std::forward_iterator_tag) [with FwdIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  213 |         detail::sequence<BidiIter> seq = this->parse_alternates(begin, end);
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:121:30:   required from ‘boost::xpressive::basic_regex<BidiIter> boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(InputIter, InputIter, flag_type) [with InputIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  121 |         return this->compile_(begin, end, flags, category());
      |                ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/regex_compiler.hpp:130:29:   required from ‘typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type boost::xpressive::regex_compiler<BidiIter, RegexTraits, CompilerTraits>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; RegexTraits = boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> >; CompilerTraits = boost::xpressive::compiler_traits<boost::xpressive::regex_traits<char, boost::xpressive::cpp_regex_traits<char> > >; typename boost::disable_if<boost::is_pointer<InputRange>, boost::xpressive::basic_regex<BidiIter> >::type = boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> > >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  130 |         return this->compile(boost::begin(pat), boost::end(pat), flags);
      |                ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/xpressive/basic_regex.hpp:193:50:   required from ‘static boost::xpressive::basic_regex<BidiIter> boost::xpressive::basic_regex<BidiIter>::compile(const InputRange&, flag_type) [with InputRange = std::__cxx11::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string<char> >; flag_type = boost::xpressive::regex_constants::syntax_option_type]’
  193 |         return regex_compiler<BidiIter>().compile(pat, flags);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
internal_unigram_sequence_segmentation.cpp:45:55:   required from here
   45 |             if(xp::regex_search(x, xp::sregex::compile(std::string(patterns[i])))) {
      |                                    ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:20:48: warning: ‘this’ pointer is null [-Wnonnull]
   20 |     ~usage_requirements() { ((Model*)0)->~Model(); }
      |                             ~~~~~~~~~~~~~~~~~~~^~
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/concept/usage.hpp:37:7: note: in a call to non-static member function ‘boost::SinglePassRangeConcept<T>::~SinglePassRangeConcept() [with T = std::__cxx11::basic_string<char>]’
   37 |       ~model()
      |       ^
/home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/BH/include/boost/range/concepts.hpp:284:9: note: in expansion of macro ‘BOOST_CONCEPT_USAGE’
  284 |         BOOST_CONCEPT_USAGE(SinglePassRangeConcept)
      |         ^~~~~~~~~~~~~~~~~~~
g++-14 -std=gnu++17 -shared -L/home/hornik/tmp/R.check/r-release-gcc/Work/build/lib -Wl,-O1 -o NUSS.so RcppExports.o internal_unigram_sequence_segmentation.o -L/home/hornik/tmp/R.check/r-release-gcc/Work/build/lib -lR
make[1]: Leaving directory '/home/hornik/tmp/scratch/Rtmp94hd5H/R.INSTALLd099198c7c87/NUSS/src'
make[1]: Entering directory '/home/hornik/tmp/scratch/Rtmp94hd5H/R.INSTALLd099198c7c87/NUSS/src'
make[1]: Leaving directory '/home/hornik/tmp/scratch/Rtmp94hd5H/R.INSTALLd099198c7c87/NUSS/src'
installing to /home/hornik/tmp/R.check/r-release-gcc/Work/build/Packages/00LOCK-NUSS/00new/NUSS/libs
** R
** data
*** moving datasets to lazyload DB
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
** checking absolute paths in shared objects and dynamic libraries
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (NUSS)