[Bug c++/58859] throwing exceptions in destructors causes std::terminate called unnecessarily.

[meng at g dot clemson.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58859

--- Comment #4 from meng at g dot clemson.edu ---
ok, I think I missed 15.4/4 and 12.4/3, which means the dtor in my example
should allow no exceptions, i.e., noexcept(true). Thanks again.