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

[dje at gcc dot gnu.org]

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

--- Comment #3 from David Edelsohn <dje at gcc dot gnu.org> ---
Created attachment 34038
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34038&action=edit
preprocessed source for testcase