https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87150
--- Comment #9 from Stephan Bergmann <sbergman at redhat dot com> --- (In reply to Marek Polacek from comment #8) > It appears that the sentiment is that this testcase should actually be > valid Do you have a reference for that? The reason for this not to be valid, presented at the bottom of <http://lists.llvm.org/pipermail/cfe-dev/2018-August/059190.html> "Re: [cfe-dev] return lvalue move instead of copy?" looks rather convincing to me.
