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From: "blubban at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/115318] decltype(lambda) from an template function inside a
 templated lambda causes ICE
Date: Thu, 13 Jun 2024 11:33:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115318

--- Comment #2 from Alfred Agrell <blubban at gmail dot com> ---
struct a { int c; };

template<int=3D1>
struct ddd {
    int f()
    {
        using a2 =3D decltype([]<int=3D2>(int a::*)->a{}(&a::c));
        return []<int=3D4>(int a2::*){ return 2; }(&a::c);
    }
};

int xs() { return ddd().f(); }


-std=3Dc++20 again


-> <source>:8:16: sorry, unimplemented: mangling offset_ref


https://godbolt.org/z/4M3ToqqPW


Adding a <int=3D2> 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.=