[Bug c++/115378] [14/15 Regression] ICE with lambda function as a default template argument with variadic templates in some cases

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115378

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-06-06
            Summary|[ice-on-valid] code using   |[14/15 Regression] ICE with
                   |friend injection is         |lambda function as a
                   |crashing gcc since 14       |default template argument
                   |                            |with variadic templates in
                   |                            |some cases
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Target Milestone|---                         |14.2

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I don't think it was exactly working in GCC 13 either even though it was
not ICEing.
With my reduced testcase we get the following (wrong) warning for GCC 13:
<source>:4:33: warning: no return statement in function returning non-void
[-Wreturn-type]
    4 | template<class Slot, auto Tag = []{}>
      |                                 ^~~~