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  1. or download this
    Useless use of a variable in void context
  2. or download this
    lorien:~$ perl -wle '$SIG{__WARN__}=sub{print"TRAPED"};s///'
TRAPED
...
Useless use of a variable in void context at -e line 1.
lorien:~$  perl -wle 'BEGIN{$SIG{__WARN__}=sub{print"TRAPED"};}$.,$.=0
+'
TRAPED
  3. or download this
    lorien:~$  perl -wle '$SIG{__WARN__}=sub{print"TRAPED"};eval q{$.,$.=0
+;}'
lorien:~$
lorien:~$  perl -wle '$SIG{__WARN__}=sub{print"TRAPED"};eval {$.,$.=0;
+}'
Useless use of a variable in void context at -e line 1.
lorien:~$