[Bug c++/84578] [6/7/8 Regression] ICE with flexible array member and constexpr

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84578

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|ice-on-valid-code           |ice-on-invalid-code

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
I think the code should be rejected in constexpr contexts, as Clang does. 
Otherwise the size of A::x is zero, which would make it an invalid object.  I'm
changing it to ice-on-invalid-code but please let me know if you know of an
argument for accepting it.