#define FN(f) \
  [&]<typename ...Args>(Args &&...args) -> decltype(auto) \
    requires requires { (f)(std::forward<Args>(args)...); } \
  { return (f)(std::forward<Args>(args)...); }

[&]
<typename... Ts>
requires something<Ts...>
[[noreturn]]
(Ts&&... ts)
mutable
noexcept(true)
[[another_attr]]
-> decltype(auto)
requires requires { someThing(ts...); }
pre(somePre(ts...))
{
  ohFinallyTheBody();
}

template<size_t i>
consteval void count_to_one() {
    if constexpr (i <= 1) {
        return;
    }

    char buffer[i];
    if constexpr (i % 2 == 0) {
        // ... do something if `i` is even
        return count_to_one<i - 1>();
    } else {
        // ... do something if `i` is odd
        return count_to_one<i - 1>();
    }
}

int main() {
    count_to_one<10>();
}