[Bug libstdc++/58876] No non-virtual-dtor warning in std::unique_ptr

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58876

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, I should dig Ian's bug out and have another look. I'm planning to throw
some ideas around on the mailing list ...