[Bug c++/57367] Missing warning: array subscript is above array bounds

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57367

--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Remember that -O2 is required for this kind of middle-end check. A front-end
check would not.