My (small) problem with this would be that the "unused" variable might still serve some purpose. Consider a compute_some_value() like one of these: 

sub pay_attention {
   die 'void context' if ! defined wantarray;
   return rand;
}
sub side_effect {
   print "I am happy.\n";
   return;
}
sub wait_for_destruction {
   return OnDestroyDo->new( \&side_effect );
}

[download]

In case that last one is not clear, the idea is that it returns an object that will perform some action when it is destroyed.

Arguably a warning is still warranted in even these cases, but it might not be easy to tell when an assigned value is really superfluous.

In reply to Re: Warning about unused lexical variables by kyle
in thread Warning about unused lexical variables by blazar

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