https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115318
--- Comment #2 from Alfred Agrell <blubban at gmail dot com> ---
struct a { int c; };
template<int=1>
struct ddd {
int f()
{
using a2 = decltype([]<int=2>(int a::*)->a{}(&a::c));
return []<int=4>(int a2::*){ return 2; }(&a::c);
}
};
int xs() { return ddd().f(); }
-std=c++20 again
-> <source>:8:16: sorry, unimplemented: mangling offset_ref
https://godbolt.org/z/4M3ToqqPW
Adding a <int=2> to the first lambda changes the error to the same ICE as this
issue (https://godbolt.org/z/Pq9T16GvP), so I'm about 98% sure it's the same
root cause.
