[Bug c++/120775] [C++26] P2996R13 - Reflection

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120775

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The #c8 ICE can be reduced to

constexpr void foo () { if consteval { static constexpr auto a = ^^::; } }
auto bar () { return &foo; }

or

template <typename T> struct S { static constexpr auto s = ^^T; void foo () {
constexpr auto s = ^^T; } };
template struct S <int>;

The first ICE is during mangling, where we try to mangle the foo::a static
variable, the second ICE is trying to output the S<int>::s variable.