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  1. or download this
    use strict;
use warnings;
...
$exeif = '!exists $hash{baz}';
print "Single quotes, non-existing key: <$exeif>\n";
testAndExec $exeif;
  2. or download this
    Double quotes, existing key: <!exist bar>
Not executing this time.
...

Single quotes, non-existing key: <!exists $hash{baz}>
This is executed!