https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119075
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #3)
> You can construct a contrived testcase that fails the same way due to the
> _Bit_reference(_Bit_type*, _Bit_type) constructor:
>
> #include <vector>
> #include <type_traits>
>
> struct X { X(int, int) { } };
>
> int test2(std::vector<bool>::reference);
> void test2(X);
>
> static_assert(std::is_same<decltype(test2({0,0})), void>::value, "");
>
>
> This is ambiguous for the same reason.
Actually it seems only GCC thinks this one is ambiguous.
