Re: Line numbers

Don't use __LINE__.
Instead use [caller(0)]->[2].

See the documentation for the caller function in perlfunc.

Full example:

sub fatal_error {
  print STDERR "ERROR: ", @_," ",[caller(0)]->[2];
  usage();
  exit 1;
}
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perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'