[Bug libstdc++/107525] propagate_const should not be using SFINAE on its conversion operators

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107525

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Keywords|                            |rejects-valid
   Last reconfirmed|                            |2022-11-04
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Giuseppe D'Angelo from comment #0)
> So. ideally, the conversion operators should be using C++20 constraints, but
> of course that's not possible.

It's totally possible for C++20 mode.

I don't know how much motivation anybody has to do anything about this though.