https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80451
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
LWG 2451 is a specification change, which isn't reflected in the
cppreference.com docs. Using std::move(b) is a workaround. I'm still trying to
determine why the workaround is needed.

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