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  1. or download this
    use strict;
use warnings;
...
warn "outside";

testsub();
  2. or download this
    > perl -d d:/tmp/pm/db_demo.pl 

...
 at d:/tmp/pm/db_demo.pl line 10.
    main::testsub() called at d:/tmp/pm/db_demo.pl line 16
  DB<2>