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  1. or download this
    use warnings;
use strict;
...
}

foo();
  2. or download this
    $ perl $_
Argument "!M" isn't numeric in numeric eq (==) at tst.pl line 11.
Argument "some_val" isn't numeric in numeric eq (==) at tst.pl line 11
+.
Undefined subroutine &main::xmlFileData called at tst.pl line 14.