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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 modify non-lvalue subroutine call

(F) Subroutines meant to be used in lvalue context should be declared as such, see 8.4.

ISBN 9781906966027Perl Language Reference ManualSee the print edition