https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108155

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #2)
> Clang and EDG don't warn for this either, so maybe I'm the only person dumb
> enough to write this. It still seems useful, if we can define the right
> semantics without false positives, but it's not a priority.

No I have accidently written this too before. 
The only false positive I can think of is with macros really.

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