[Bug c++/63942] [5.0 Regression] constexpr conflicts with previous declaration

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63942

--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to David Edelsohn from comment #6)
> It still occurred as of [trunk revision 217822]

I'm still not seeing it in a cross-compiler.  Does the error depend on
particular flags?