[Bug libstdc++/87809] [8/9 Regression] Can't create empty std::optional>

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87809

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|8.2.0                       |7.3.0
   Target Milestone|9.0                         |8.3
            Summary|[9 Regression] Can't create |[8/9 Regression] Can't
                   |empty                       |create empty
                   |std::optional<std::vector<i |std::optional<std::vector<i
                   |nt, CustomAlloc>>           |nt, CustomAlloc>>
      Known to fail|                            |8.2.0

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The vector<bool,...>, list and forward_list cases already fail with GCC 8 as
well.