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From: "mail at lboeger dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97700] Bogus error when a class containing a function
 pointer is used as a non-type template parameter
Date: Tue, 09 May 2023 21:23:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97700

--- Comment #5 from Lukas B=C3=B6ger <mail at lboeger dot de> ---
One part of this seems to be resolved with version 13. Below, only the lamb=
da
use case fails to compile, whereas prior to version 13, both type aliases a=
re
rejected:

```
void fun() {}
struct S=20
{=20
    void (*f)();=20
};=20

template<S> struct X {};

using works =3D X<S{ fun }>;
using does_not_work =3D X<S{ []{}}>;
```

See https://godbolt.org/z/3E7WE6zKo=