[Bug c++/86301] g++ does not mark declarations used in non-dependent types as referenced

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86301

--- Comment #2 from zhonghao at pku dot org.cn ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to zhonghao from comment #0)
> > A previous version of clang++ produces similar error message for this code,
> > but was fixed.
> 
> No it didn't, the error shown in the Clang bug comes from GCC!
> 
> Please make more effort to understand what you are doing, OR I WILL BAN YOUR
> ACCOUNT.

Did you try the latest g++ and clang++. They produce different results when
they compile the code. My clang is 7.0.0. It does not produce any error
messages for this code. Do the difference indicate bugs in g++?