http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60621

--- Comment #2 from marc at kdab dot com ---
Yes, that helps a bit, but emplace_back still generates larger code than the
corresponding rvalue-push_back. Considering that the latter also needs to
generate the implicitly defined move ctor for S, this is still somewhat
surprising and runs counter to the motivation to have emplace_back in the first
place.

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