[Bug c++/84808] [8 Regression] ICE with constexpr and array

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84808

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43629
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43629&action=edit
gcc8-pr84808.patch

Untested fix.