https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83060
--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- I'd say for C it's valid to reject &a.s[-1] and &a.s[__PTRDIFF_MAX__] in static initializers, because there is no guarantee that such addresses are valid values of the pointer type (only pointers to actual array elements or just-past-end-of-array are necessarily valid). I don't think it's required to reject such initializers, however. Of course when not in a static initializer, such expressions must be accepted, while causing undefined behavior at runtime if executed.
