[Bug c/69960] "initializer element is not constant"

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69960

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Martin said almost exactly what I was going to say :-)

Compilers are allowed to accept this, as Clang does, but they are not required
to.