As others have explained, this syntax is no longer supported. This should be reported via perlbug so that the perlretut docs can be fixed. I will try to do this soon, unless someone beats me to it.

UPDATED (2018 may 3): I submitted this as a perlbug.

In reply to Re: Perl Tutorial code uses "qw" but has an error when run by toolic
in thread Perl Tutorial code uses "qw" but has an error when run by Tio Cash

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