[Bug c++/95540] [coroutine] coroutine_traits<> lookup for lambdas

[bruck.michael at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95540

--- Comment #3 from Michael Bruck <bruck.michael at gmail dot com> ---
I think you misread, I was complaining about it passing the closure to the
traits/constructor/allocator. But if that is what was agreed upon...

Can the closure object that is being passed to the constructor and allocator be
used for anything? I am asking because I got it to pass nullptr with the code
below. But if there is no legitimate use it might as well always pass a
nullptr.

template <pt::handle_t F()>
struct foo_t
{
    static auto test()
    {
        return F();
    }
};

using moo = foo_t<[]() -> pt::handle_t{ co_return; }>;
...
int main { moo::test(); }