------- Comment #5 from jwakely dot gcc at gmail dot com 2010-02-08 12:35 ------- n3000 says "Only special member functions may be explicitly defaulted, and the implementation shall define them as if they had implicit definitions."
An implicit destructor is not virtual. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#906 changes this wording -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42983
