It's a problem in the MSVC variadic template expansion process; when it unpacks the list of types it fails to recognise them as suitable for a constructor call. As a workaround, you can perform a type transformation to force the compiler to recognise them:
template<typename T> using identity_t = T; // NEW CODE
void Foo(int, int);
template<typename... Types>
void Bar()
{
Foo(identity_t<Types>{}...); // use identity type transformation
}
int main() {
Bar<int, int>();
}
I haven't managed to find an issue number yet.