[Bug c++/94771] g++.dg/concepts/diagnostic10.C fails on mingw

[sbence92 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94771

--- Comment #4 from Bence Szabó <sbence92 at gmail dot com> ---
Interesting, the t.f syntax is not allowed anymore even with MSVC:
https://godbolt.org/z/YCK-mv

msvc also doesn't list under extensions_
https://docs.microsoft.com/en-us/cpp/build/reference/microsoft-extensions-to-c-and-cpp?view=vs-2015

and some recent overview on ms extensions:
https://stackoverflow.com/questions/56554567/what-does-the-ms-extensions-flag-do-exactly-with-gcc

Is this a dinosaur that forgot to die?