[Bug c++/65133] [C++11] Result type deduction proceeds even though argument deduction fails

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65133

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Confirmed fixed for 5.1.0. I'm adding a testcase and closing the bug.