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  1. or download this
    #!/usr/bin/perl
use warnings;
...

warn 'Eh';     # Will be ignored.
warn 'Error';  # Will be reported.
  2. or download this
    #!/usr/bin/perl
use warnings;
...
warn 'Error';  # Will be reported.

done_testing();
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,