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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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Can't weaken a nonreference

(F) You attempted to weaken something that was not a reference. Only references can be weakened.

ISBN 9781906966027Perl Language Reference ManualSee the print edition