[Bug c++/92338] double/float thought (ambiguous) candidate for C-array index. (Non numeric types aren't.)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92338

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I believe GCC is right, as unhelpful as that might seem.