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  1. or download this
    if (undef = $WCkey) { ...
  2. or download this
    if (undef = $WCkey) { ...
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    if (undef == $WCkey) { ...
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    >perl -we "if (undef = $foo) { print 'bar' }"
Name "main::foo" used only once: possible typo at -e line 1.
...

>perl -we "if ($foo = undef) { print 'bar' }"
Name "main::foo" used only once: possible typo at -e line 1.