[Bug c++/121287] ICE: Segfault in tsubst_lambda_expr with decltype of immediately-invoked templated lambda + variadic lambda expansion (GCC 13+)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121287

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(Not sure about backporting to 16.2.)