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  1. or download this
    use v5.12;
use warnings;
...

foo();
bar();
  2. or download this
    42 at c:/tmp/pm/closure_demo.pl line 9.
42 at (eval 1) line 1.
...
Variable "$var" is not available at (eval 2) line 1.
Use of uninitialized value $var in warn at (eval 2) line 1.
Warning: something's wrong at (eval 2) line 1.