[Bug libstdc++/77537] [6 Regression] pair constructors do not properly SFINAE

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77537

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |5.4.0
   Target Milestone|---                         |6.3
            Summary|pair constructors do not    |[6 Regression] pair
                   |properly SFINAE             |constructors do not
                   |                            |properly SFINAE
      Known to fail|                            |6.2.0

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
With 5.4 only one of assertions failed:

pair.cc:11:1: error: static assertion failed: FAIL
 static_assert(!std::is_constructible<P<moveonly>, int, moveonly&>::value,
"FAIL");
 ^

So I'm marking this as a regression.