http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36587

Johannes Schaub <schaub.johannes at googlemail dot com> changed:

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--- Comment #7 from Johannes Schaub <schaub.johannes at googlemail dot com> ---
(In reply to Jonathan Wakely from comment #3)
> This would have prevented bugs I've dealt with where critical sections where
> not protected:
> {
>   lock_guard (mutex);
>   // mutex NOT locked here!
> }
> 

Jonathan, unfortunately that code won't create and discard a temporary object,
so I am not sure whether this patch would have caught the mistake of creating a
default constructed lock_guard (whatever that means).

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