[Bug libstdc++/70607] The return type of std::conj must be std::complex

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70607

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Aha, that DR was reverted by http://wg21.link/lwg1522 (I failed to find it
because the deleted text says "All the specified ..." and I searched for "All
of the specified ..."