[Bug c++/80451] [6/7/8 Regression] return implicit type conversion to std::experimental::optional does not compile

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80451
Bug 80451 depends on bug 80452, which changed state.

Bug 80452 Summary: [DR 1579] incorrect value category deduced for return value
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80452

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED