https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120453
--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> --- (In reply to Iain Sandoe from comment #9) > OK so the reason this fails is because check_return_expr() concludes that we > cannot do NRVO Yes, because the implementation is permitted to use temporary objects for the return, because the move ctor is trivial. > and we try to do the bad conversion. Because we're wrongly trying to call the deleted copy constructor when we should call the move constructor, because the return is move-eligible. That's the bug.
