I'd probably code it like this. 
BEGIN {
  # Keep older versions of Perl from seeing warnings.
  $INC{"warnings.pm"} = "faked" if $] < 5.006;
}
...
use warnings;

[download]
That way there is no dependency and nobody will ever have to wonder what the actual scope of your non-standard warnings loading is.

In reply to Re: Backward compatible lexical warnings by tilly
in thread Backward compatible lexical warnings by xdg

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