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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
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panic: hfreeentries failed to free hash

(P) The internal routine used to clear a hashes entries tried repeatedly, but each time something added more entries to the hash. Most likely the hash contains an object with a reference back to the hash and a destructor that adds a new object to the hash.

ISBN 9781906966027Perl Language Reference ManualSee the print edition