[Bug c++/93317] return type deduction fails for templated unary function

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93317

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, wrong bug number, I meant PR 64194

*** This bug has been marked as a duplicate of bug 64194 ***