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  1. or download this
    >perl -wle"no warnings 'uninitialized'; print '' + 4"
Argument "" isn't numeric in addition (+) at -e line 1.
...

>perl -wle"no warnings 'numeric'; print '' + 4"
4
  2. or download this
    >perl -Mdiagnostics -wle"print '' + 4"
Argument "" isn't numeric in addition (+) at -e line 1 (#1)
...
    will identify which operator was so unfortunate.

4