Non-standard file/directory found at top level:
  'package.R'
last: no visible global function definition for 'tail'
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
Non-standard file/directory found at top level:
  ‘package.R’
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
Non-standard file/directory found at top level:
  ‘package.R’
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
Non-standard file/directory found at top level:
  ‘package.R’
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for 'tail'
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for 'tail'
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
Non-standard file/directory found at top level:
  ‘package.R’
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
Non-standard file/directory found at top level:
  ‘package.R’
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for 'tail'
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for ‘tail’
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.
last: no visible global function definition for 'tail'
Undefined global functions or variables:
  tail
Consider adding
  importFrom("utils", "tail")
to your NAMESPACE file.