[Bug libstdc++/100667] [11/12/13/14 Regression] std::tuple cannot be constructed from A&&, if A not defined (only forward declared)

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100667

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Viktor Ostashevskyi from comment #1)
> I have another example, but probably related:

No, this is a completely different problem. See Bug 102257