[Bug c++/65748] [C++11][C++14]Invalid copy elision on operand of throw-exception

[frankhb1989 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65748

--- Comment #1 from frankhb1989 at gmail dot com ---
G++ 5 also seems to fail.
Recent Clang++ is OK.