The dontCheck function is the same as identity, but 
  is interpreted by R CMD check code analysis as a directive
  to suppress checking of x.  Currently this is only used by
 checkFF(registration = TRUE)
  when checking the .NAME argument of foreign function calls.
dontCheck(x)an R object.
suppressForeignCheck which explains why that and
  dontCheck are undesirable and should be avoided if at all
  possible.