[Bug c++/70228] insufficient detail in diagnostics for a constexpr out of bounds array subscript

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70228

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00796.html