[Bug c++/90938] [9/10 Regression] Initializing array with {1} works, but not {0}

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90938

--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
I plan to submit a patch for GCC 10 and (hopefully) also GCC 9.x.  What's the
cutoff for 9?