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Re^3: Strange behavior with List::Util qw{first} on perl >= 5.20by ikegami (Patriarch) |
on May 27, 2015 at 14:42 UTC ( [id://1128006]=note: print w/replies, xml ) | Need Help?? |
There's something fishy about $_. It's a TEMP with REFCNT=1. I believe that means it's a mortal. If so, that means noone claims a reference to $_, but first still uses it after the callback returns. This points to a bug in List::Util. That said, the inplace lc($_)[1] should probably only happen in void context.
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