[Bug c++/68087] [5/6 Regression] ICE with constexpr in array with negative index

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68087

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I see, thanks. I'm going to trivially tweak the dg-error.