[Bug c++/91678] [9/10 Regression] decltype returns wrong type under certain conditions

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91678

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Marek, are you still working on the patch?

Does it also fix the testcase from PR 92766?

    template<typename T>
    void foo(T&& begin, T&& end);

    void test()
    {
        unsigned char buffer[16];
        const unsigned char* ptr = buffer;
        foo(ptr+0, ptr+8);
    }