//! Copied over from:
//! https://github.com/tokio-rs/tokio/blob/master/tokio/tests/async_send_sync.rs
#![allow(dead_code)]

fn require_send<T: Send>(_t: &T) {}
fn require_sync<T: Sync>(_t: &T) {}
fn require_unpin<T: Unpin>(_t: &T) {}

struct Invalid;

trait AmbiguousIfSend<A> {
    fn some_item(&self) {}
}
impl<T: ?Sized> AmbiguousIfSend<()> for T {}
impl<T: ?Sized + Send> AmbiguousIfSend<Invalid> for T {}

trait AmbiguousIfSync<A> {
    fn some_item(&self) {}
}
impl<T: ?Sized> AmbiguousIfSync<()> for T {}
impl<T: ?Sized + Sync> AmbiguousIfSync<Invalid> for T {}

trait AmbiguousIfUnpin<A> {
    fn some_item(&self) {}
}
impl<T: ?Sized> AmbiguousIfUnpin<()> for T {}
impl<T: ?Sized + Unpin> AmbiguousIfUnpin<Invalid> for T {}

macro_rules! into_todo {
    ($typ:ty) => {{
        let x: $typ = todo!();
        x
    }};
}

macro_rules! async_assert_fn_send {
    (Send & $(!)?Sync & $(!)?Unpin, $value:expr) => {
        require_send(&$value);
    };
    (!Send & $(!)?Sync & $(!)?Unpin, $value:expr) => {
        AmbiguousIfSend::some_item(&$value);
    };
}

macro_rules! async_assert_fn_sync {
    ($(!)?Send & Sync & $(!)?Unpin, $value:expr) => {
        require_sync(&$value);
    };
    ($(!)?Send & !Sync & $(!)?Unpin, $value:expr) => {
        AmbiguousIfSync::some_item(&$value);
    };
}

macro_rules! async_assert_fn_unpin {
    ($(!)?Send & $(!)?Sync & Unpin, $value:expr) => {
        require_unpin(&$value);
    };
    ($(!)?Send & $(!)?Sync & !Unpin, $value:expr) => {
        AmbiguousIfUnpin::some_item(&$value);
    };
}

macro_rules! async_assert_fn {
    ($($f:ident $(< $($generic:ty),* > )? )::+($($arg:ty),*): $($tok:tt)*) => {
        #[allow(unreachable_code)]
        #[allow(unused_variables)]
        #[allow(clippy::diverging_sub_expression)]
        const _: fn() = || {
            let f = $($f $(::<$($generic),*>)? )::+( $( into_todo!($arg) ),* );
            async_assert_fn_send!($($tok)*, f);
            async_assert_fn_sync!($($tok)*, f);
            async_assert_fn_unpin!($($tok)*, f);
        };
    };
}
macro_rules! assert_value {
    ($type:ty: $($tok:tt)*) => {
        #[allow(unreachable_code)]
        #[allow(unused_variables)]
        #[allow(clippy::diverging_sub_expression)]
        const _: fn() = || {
            let f: $type = todo!();
            async_assert_fn_send!($($tok)*, f);
            async_assert_fn_sync!($($tok)*, f);
            async_assert_fn_unpin!($($tok)*, f);
        };
    };
}

assert_value!(turmoil::net::TcpListener: Send & Sync & Unpin);
assert_value!(turmoil::net::TcpStream: Send & Sync & Unpin);
assert_value!(turmoil::net::UdpSocket: Send & Sync & Unpin);
assert_value!(turmoil::net::tcp::OwnedReadHalf: Send & Sync & Unpin);
assert_value!(turmoil::net::tcp::OwnedWriteHalf: Send & Sync & Unpin);
assert_value!(turmoil::net::tcp::ReuniteError: Send & Sync & Unpin);
async_assert_fn!(turmoil::net::TcpListener::accept(_): Send & Sync & !Unpin);