#[macro_export]
macro_rules! assert_impl_any {
    ($x:ty: $($t:path),+ $(,)?) => {
        const _: fn() = || {
            use core::marker::PhantomData;
            use core::ops::Deref;

            struct AssertAnyTraitNoTrait;
            let next = AssertAnyTraitNoTrait;

            // Ensures that blanket traits can't impersonate the method.
            struct AssertAnyTraitToken;
            $(
                let next = {
                    struct Wrapper<T, N>(PhantomData<T>, N);
                    // If the `__static_assert__has_any_trait` method for this wrapper can't be called then
                    // the compiler will insert a deref and try again. This forwards the compilers next
                    // attempt to the previous wrapper.
                    impl<T, N> Deref for Wrapper<T, N> {
                        type Target = N;
                        fn deref(&self) -> &Self::Target {
                            &self.1
                        }
                    }
                    // This impl has a trait bound on $x so the method can only be called if $x implements $t.
                    impl<T: $t, N> Wrapper<T, N> {
                        #[allow(non_snake_case)]
                        // The `TOKEN` generic ensures that a method on a blanket trait can't be generic and therefore accept the `AssertAnyTraitToken`.
                        fn __static_assert__has_any_trait<TOKEN>(&self, _: AssertAnyTraitToken) {}
                    }
                    Wrapper::<$x, _>(PhantomData, next)
                };
            )+
            // Attempt to find a `__static_assert__has_any_trait` method that can actually be called.
            next.__static_assert__has_any_trait::<()>(AssertAnyTraitToken);
        };
    };
}

mod tests {
    #[test]
    fn should_compile() {
        assert_impl_any!((): Send, Sync);
        assert_impl_any!((): Send, From<u8>);
        assert_impl_any!((): From<u8>, From<u16>, Send);
    }

    /// The macro isn't perfect and a trait with the correct method name can interfere with the macro.
    ///
    /// This tests the case with interference where the macro should normally fail. The interference still causes the macro to fail so this doesn't really matter.
    ///
    /// ```compile_fail
    /// use playground::assert_impl_any;
    ///
    /// trait Interfere {
    ///     #[allow(non_snake_case)]
    ///     fn __static_assert__has_any_trait<A>(&self, token: A) {}
    /// }
    /// impl<T> Interfere for T {}
    ///
    /// // This test would fail if this is true: These should fail to compile but the above trait interferes and causes them to actually compile anyway.
    /// assert_impl_any!((): From<u8>);
    /// assert_impl_any!((): From<u8>, From<u16>);
    /// ```
    #[allow(dead_code)]
    fn interference_for_fail_case() {}

    /// The macro isn't perfect and a trait with the correct method name can interfere with the macro.
    ///
    /// This tests the case with interference where the macro should normally succeed. The interference causes the macro to fail, this isn't really a problem since it is very unlikely that the correct trait actually exists.
    ///
    /// ```compile_fail
    /// use playground::assert_impl_any;
    ///
    /// trait Interfere {
    ///     #[allow(non_snake_case)]
    ///     fn __static_assert__has_any_trait(&self: token: ()) {}
    /// }
    /// impl<T> Interfere for T {}
    ///
    /// // These should actually compile but the above trait interferes and causes them to fail anyway.
    /// assert_impl_any!((): Send, Sync);
    /// assert_impl_any!((): Send, From<u8>);
    /// assert_impl_any!((): From<u8>, From<u16>, Send);
    /// ```
    #[allow(dead_code)]
    fn interference_for_success_case() {}

    /// A function that should fail to compile.
    ///
    /// ```compile_fail
    /// use playground::assert_impl_any;
    /// assert_impl_any!((): From<u8>);
    /// assert_impl_any!((): From<u8>, From<u16>);
    /// ```
    #[allow(dead_code)]
    fn should_fail() {}
}