[Bug c++/127855] [14/15/16/16 Regression] CTAD through an alias of an alias whose target is `const Y`: pedwarn, then ICE in `set_constraints` with -std=gnu++17

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127855

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |12.5.0
     Ever confirmed|0                           |1
           Keywords|                            |ice-on-invalid-code,
                   |                            |needs-bisection
   Target Milestone|---                         |14.5
   Last reconfirmed|                            |2026-10-13
            Summary|[GCC C++17] CTAD through an |[14/15/16/16 Regression]
                   |alias of an alias whose     |CTAD through an alias of an
                   |target is `const Y<T>`:     |alias whose target is
                   |pedwarn, then ICE in        |`const Y<T>`: pedwarn, then
                   |`set_constraints`           |ICE in `set_constraints`
                   |(constraint.cc:1053)        |with -std=gnu++17
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
.