[Bug libstdc++/82481] dangling reference in mutex:693

[heinzisoft at web dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82481

--- Comment #4 from heinzisoft at web dot de ---
(In reply to Jonathan Wakely from comment #3)
> (In reply to heinzisoft from comment #0)
> > Building the following minimal example with libstdc++ 7.0.1
> 
> And why are you using that unsupported version?

I installed it on Ubuntu using ppa:ubuntu-toolchain-r/test