https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101566
--- Comment #2 from Dale Weiler <weilercdale at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> f.0_1 = f_8(D);
> tuple = t;
> _11 = &tuple.__ts#2;
> tuple ={v} {CLOBBER};
>
>
> template<Size N, typename T>
> constexpr decltype(auto) get(T tuple) { return *tuple(Get<N>{}); }
>
>
> I think the above function (get) is broken and is returning a reference to
> the argument and that would be invalid.
Ah, passing `T&` here instead of T does appear to avoid the issue, the question
now becomes why does -fsanitize=undefined find nothing, and is the return type,
i.e `declval(get<N>(t))` different in gcc compared to the other compiles. I
would expect similar issues in the other compilers if this is returning a
reference to the temporary given by the argument list of `get`
