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Yikes, that's a bug(update: shows a bug in perl itself). The call to length should explicitly be passing $_, but it's not (update: passes nothing) when it is overridden. This causes a problem with lexical $_:
$ perl5.9.4 -w BEGIN{ *CORE::GLOBAL::length = sub (;$) { my $arg = @_ ? $_[0] : $_; defined($arg) ? CORE::length($arg) : undef; } } $_ = "abc"; my $_; $_ = "defghi"; print length; __END__ 3
This should print 6 whether length is overridden or not, but as is prints 3 when it is overridden.

Update: after consideration, I think this is just a natural consequence of the ;$ prototype, and should be no longer a problem with a _ prototype (when someone implements that).


In reply to Re^2: This could have DWIM better by ysth
in thread This could have DWIM better by Aristotle

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