[Bug c++/66968] Incorrect template argument shown in diagnostic

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66968

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
To reproduce the std::tuple error above, use this code at r12-2379

#include <tuple>
std::tuple<int> t;
auto a = std::get<1>(t);