[Bug c++/123931] [reflection] bogus "is not a constant expression error" with reflect_constant_array

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123931

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
We claim that 

  {{}, {}, {}}

of type "const struct Interpolation[3]" is not a reduced constant expression,
because the nested {} don't initialize Interpolation.