https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88822
--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- If an rvalue's type (or, for that matter, an lvalue's type) is observed with _Generic, the qualifiers should be consistently dropped. If a type is observed with typeof, qualifiers need to be kept in some cases for compatibility. That's definitely the case with lvalues (because of use of typeof for defining aliases); I doubt it's the case for at least these rvalues. If a type is observed in the text of a diagnostic, there are of course no compatibility requirements on whether qualifiers are present or not; it's a question of what's most helpful for the user (and for the message about the assignment, I don't think the qualifiers are helpful even for lvalues, given that the RHS has gone through lvalue-to-rvalue conversion). (For _Atomic, the reference to p3 gets an explicit atomic_load applied by the compiler in its internal representation before the &* are applied, hence the qualifiers having been removed there.)
