The reason is because qw() and qx() is the only quoting operators that return a list. Perl disregards that, though, and just notices your use of a single OR double quote. The problem is in toke.c. I'm working on a fix right now, if I can.

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Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;