[Bug c++/123658] [13/14/15/16 Regression] ICE in tsubst_expr (at cp/pt.cc) when lambda in template accesses member of local constexpr struct without capture

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123658

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
      Known to work|13.3.0, 14.2.0              |
   Last reconfirmed|                            |2026-01-18
   Target Milestone|---                         |13.5
      Known to fail|                            |12.1.0
             Status|UNCONFIRMED                 |NEW

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
`x.value ?: 0;` was ICEing all the way to GCC 12.1.0
while `x.value ?x.value: 0;` was being rejected until 13.4.0, 14.3.0, 15.1.0
where GCC starts to ICE too.

`x.value ;` was accepted until GCC 14.1.0 when GCC starts to ICE.