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Attempt to free nonexistent shared string

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Attempt to free nonexistent shared string
(P) Perl maintains a reference counted internal table of strings to optimize the storage and access of hash keys and other strings. This indicates someone tried to decrement the reference count of a string that can no longer be found in the table.

Attempt to use reference as lvalue in substr
(W) You supplied a reference as the first argument to substr() used as an lvalue, which is pretty strange. Perhaps you forgot to dereference it first. See substr.

Source: what's new for perl5.004
Copyright: Larry Wall, et al.
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