[Bug c++/86186] Unqualified calls of std::get lead to ADL issues

[zhonghao at pku dot org.cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86186

--- 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++ does not produce any error messages for the
> > above code, but it was fixed in https://bugs.llvm.org/show_bug.cgi?id=20092
> 
> No, you've completely misunderstood the llvm bug report.

Never the less, g++ accepts the code, but clang++ rejects it, right?

My g++ is 8.0.1 20180413, my clang++ is 7.0.0 (trunk 329990).

The warning message of clang++ is as follow:
17:5: warning: equality comparison result unused
      [-Wunused-comparison]
 t1 == t2; // error: static_assert failed ""
 ~~~^~~~~
code2.c.cpp:17:5: note: use '=' to turn this equality comparison into an
      assignment
 t1 == t2; // error: static_assert failed ""
    ^~
    =
1 warning generated.

The message sounds reasonable, but g++ does not produce any warning messages.
Shall g++ make the improvement?