[Bug c++/57319] [4.8 Regression]: bogus "defaulted move assignment for ... calls a non-trivial move assignment operator for virtual base ..."

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57319

--- Comment #3 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
Thanks for the fix.
Confirmed for both the reduced test case, and the original source.

Can this be back-ported to 4.8 branch?