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  1. or download this
    $ perl -le 'use warnings qw(FATAL); my $a = "2:" + 3; print $a'
5
  2. or download this
    $ perl -le 'use warnings; my $a = "2:" + 3; print $a'
Argument "2:" isn't numeric in addition (+) at -e line 1.
5
  3. or download this
    $ perl -le 'use warnings qw(FATAL all); my $a = "2:" + 3; print $a'
Argument "2:" isn't numeric in addition (+) at -e line 1.