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if (
  running_under_windows
...
  and
  package_Foo doesn't exist
) { warn about case of Foo }

use Strict;
$x = 10;

BEGIN {
  require Strict;
  Strict->import;
}

Name "main::Dumper" used only once: possible typo at -e line 1.
Filehandle main::Dumper never opened at -e line 1.