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#!/usr/bin/perl
...
$thing = "bleh";
print "hello $thing $bleh\n";

#!/usr/bin/perl

...

print "@violations\n";

$ perl critic ;perl thing 
...
Global symbol "$thing" requires explicit package name at thing line 8.
Global symbol "$bleh" requires explicit package name at thing line 8.
Execution of thing aborted due to compilation errors.