[Bug c++/101631] gcc allows for the changing of an union active member to be changed via a reference

[nathanieloshead at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101631

--- Comment #6 from Nathaniel Shead <nathanieloshead at gmail dot com> ---
(In reply to Sam James from comment #5)
> Fixed for 14 then by the drive-by bit or is there something left?
It should be fixed now. The example in comment #2 is
g++.dg/cpp2a/constexpr-union2.C.