$ pm_which Perl::Critic
C:\perl\site\5.14.1\lib\Perl\Critic.pm

$ ack "Useless interpolation of literal string" C:\perl\site\5.14.1\lib\Perl\Critic
C:\perl\site\5.14.1\lib\Perl\Critic\Policy\ValuesAndExpressions\ProhibitInterpolationOfLiterals.pm
24:Readonly::Scalar my $DESC => q{Useless interpolation of literal string};