1 files changed, 327 insertions, 0 deletions
diff --git a/tests/ui/regions/issue-2718.rs b/tests/ui/regions/issue-2718.rs
new file mode 100644
index 00000000000..6449337eea4
--- /dev/null
+++ b/tests/ui/regions/issue-2718.rs
@@ -0,0 +1,327 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(unused_unsafe)]
+#![allow(unused_imports)]
+#![allow(non_camel_case_types)]
+
+pub type Task = isize;
+
+// tjc: I don't know why
+pub mod pipes {
+    use self::state::{empty, full, blocked, terminated};
+    use super::Task;
+    use std::mem::{forget, transmute};
+    use std::mem::{replace, swap};
+    use std::mem;
+    use std::thread;
+    use std::marker::Send;
+
+    pub struct Stuff<T> {
+        state: state,
+        blocked_task: Option<Task>,
+        payload: Option<T>
+    }
+
+    #[derive(PartialEq, Debug)]
+    #[repr(isize)]
+    pub enum state {
+        empty,
+        full,
+        blocked,
+        terminated
+    }
+
+    pub struct packet<T> {
+        state: state,
+        blocked_task: Option<Task>,
+        payload: Option<T>
+    }
+
+    unsafe impl<T:Send> Send for packet<T> {}
+
+    pub fn packet<T:Send>() -> *const packet<T> {
+        unsafe {
+            let p: *const packet<T> = mem::transmute(Box::new(Stuff{
+                state: empty,
+                blocked_task: None::<Task>,
+                payload: None::<T>
+            }));
+            p
+        }
+    }
+
+    mod rusti {
+      pub fn atomic_xchg(_dst: &mut isize, _src: isize) -> isize { panic!(); }
+      pub fn atomic_xchg_acq(_dst: &mut isize, _src: isize) -> isize { panic!(); }
+      pub fn atomic_xchg_rel(_dst: &mut isize, _src: isize) -> isize { panic!(); }
+    }
+
+    // We should consider moving this to ::std::unsafe, although I
+    // suspect graydon would want us to use void pointers instead.
+    pub unsafe fn uniquify<T>(x: *const T) -> Box<T> {
+        mem::transmute(x)
+    }
+
+    pub fn swap_state_acq(dst: &mut state, src: state) -> state {
+        unsafe {
+            transmute(rusti::atomic_xchg_acq(transmute(dst), src as isize))
+        }
+    }
+
+    pub fn swap_state_rel(dst: &mut state, src: state) -> state {
+        unsafe {
+            transmute(rusti::atomic_xchg_rel(transmute(dst), src as isize))
+        }
+    }
+
+    pub fn send<T:Send>(mut p: send_packet<T>, payload: T) {
+        let p = p.unwrap();
+        let mut p = unsafe { uniquify(p) };
+        assert!((*p).payload.is_none());
+        (*p).payload = Some(payload);
+        let old_state = swap_state_rel(&mut (*p).state, full);
+        match old_state {
+          empty => {
+            // Yay, fastpath.
+
+            // The receiver will eventually clean this up.
+            unsafe { forget(p); }
+          }
+          full => { panic!("duplicate send") }
+          blocked => {
+
+            // The receiver will eventually clean this up.
+            unsafe { forget(p); }
+          }
+          terminated => {
+            // The receiver will never receive this. Rely on drop_glue
+            // to clean everything up.
+          }
+        }
+    }
+
+    pub fn recv<T:Send>(mut p: recv_packet<T>) -> Option<T> {
+        let p = p.unwrap();
+        let mut p = unsafe { uniquify(p) };
+        loop {
+            let old_state = swap_state_acq(&mut (*p).state,
+                                           blocked);
+            match old_state {
+              empty | blocked => { thread::yield_now(); }
+              full => {
+                let payload = replace(&mut p.payload, None);
+                return Some(payload.unwrap())
+              }
+              terminated => {
+                assert_eq!(old_state, terminated);
+                return None;
+              }
+            }
+        }
+    }
+
+    pub fn sender_terminate<T:Send>(p: *const packet<T>) {
+        let mut p = unsafe { uniquify(p) };
+        match swap_state_rel(&mut (*p).state, terminated) {
+          empty | blocked => {
+            // The receiver will eventually clean up.
+            unsafe { forget(p) }
+          }
+          full => {
+            // This is impossible
+            panic!("you dun goofed")
+          }
+          terminated => {
+            // I have to clean up, use drop_glue
+          }
+        }
+    }
+
+    pub fn receiver_terminate<T:Send>(p: *const packet<T>) {
+        let mut p = unsafe { uniquify(p) };
+        match swap_state_rel(&mut (*p).state, terminated) {
+          empty => {
+            // the sender will clean up
+            unsafe { forget(p) }
+          }
+          blocked => {
+            // this shouldn't happen.
+            panic!("terminating a blocked packet")
+          }
+          terminated | full => {
+            // I have to clean up, use drop_glue
+          }
+        }
+    }
+
+    pub struct send_packet<T:Send> {
+        p: Option<*const packet<T>>,
+    }
+
+    impl<T:Send> Drop for send_packet<T> {
+        fn drop(&mut self) {
+            unsafe {
+                if self.p != None {
+                    let self_p: &mut Option<*const packet<T>> =
+                        mem::transmute(&mut self.p);
+                    let p = replace(self_p, None);
+                    sender_terminate(p.unwrap())
+                }
+            }
+        }
+    }
+
+    impl<T:Send> send_packet<T> {
+        pub fn unwrap(&mut self) -> *const packet<T> {
+            replace(&mut self.p, None).unwrap()
+        }
+    }
+
+    pub fn send_packet<T:Send>(p: *const packet<T>) -> send_packet<T> {
+        send_packet {
+            p: Some(p)
+        }
+    }
+
+    pub struct recv_packet<T:Send> {
+        p: Option<*const packet<T>>,
+    }
+
+    impl<T:Send> Drop for recv_packet<T> {
+        fn drop(&mut self) {
+            unsafe {
+                if self.p != None {
+                    let self_p: &mut Option<*const packet<T>> =
+                        mem::transmute(&mut self.p);
+                    let p = replace(self_p, None);
+                    receiver_terminate(p.unwrap())
+                }
+            }
+        }
+    }
+
+    impl<T:Send> recv_packet<T> {
+        pub fn unwrap(&mut self) -> *const packet<T> {
+            replace(&mut self.p, None).unwrap()
+        }
+    }
+
+    pub fn recv_packet<T:Send>(p: *const packet<T>) -> recv_packet<T> {
+        recv_packet {
+            p: Some(p)
+        }
+    }
+
+    pub fn entangle<T:Send>() -> (send_packet<T>, recv_packet<T>) {
+        let p = packet();
+        (send_packet(p), recv_packet(p))
+    }
+}
+
+pub mod pingpong {
+    use std::mem;
+
+    pub struct ping(::pipes::send_packet<pong>);
+
+    unsafe impl Send for ping {}
+
+    pub struct pong(::pipes::send_packet<ping>);
+
+    unsafe impl Send for pong {}
+
+    pub fn liberate_ping(p: ping) -> ::pipes::send_packet<pong> {
+        unsafe {
+            let _addr : *const ::pipes::send_packet<pong> = match &p {
+              &ping(ref x) => { mem::transmute(x) }
+            };
+            panic!()
+        }
+    }
+
+    pub fn liberate_pong(p: pong) -> ::pipes::send_packet<ping> {
+        unsafe {
+            let _addr : *const ::pipes::send_packet<ping> = match &p {
+              &pong(ref x) => { mem::transmute(x) }
+            };
+            panic!()
+        }
+    }
+
+    pub fn init() -> (client::ping, server::ping) {
+        ::pipes::entangle()
+    }
+
+    pub mod client {
+        use pingpong;
+
+        pub type ping = ::pipes::send_packet<pingpong::ping>;
+        pub type pong = ::pipes::recv_packet<pingpong::pong>;
+
+        pub fn do_ping(c: ping) -> pong {
+            let (sp, rp) = ::pipes::entangle();
+
+            ::pipes::send(c, pingpong::ping(sp));
+            rp
+        }
+
+        pub fn do_pong(c: pong) -> (ping, ()) {
+            let packet = ::pipes::recv(c);
+            if packet.is_none() {
+                panic!("sender closed the connection")
+            }
+            (pingpong::liberate_pong(packet.unwrap()), ())
+        }
+    }
+
+    pub mod server {
+        use pingpong;
+
+        pub type ping = ::pipes::recv_packet<pingpong::ping>;
+        pub type pong = ::pipes::send_packet<pingpong::pong>;
+
+        pub fn do_ping(c: ping) -> (pong, ()) {
+            let packet = ::pipes::recv(c);
+            if packet.is_none() {
+                panic!("sender closed the connection")
+            }
+            (pingpong::liberate_ping(packet.unwrap()), ())
+        }
+
+        pub fn do_pong(c: pong) -> ping {
+            let (sp, rp) = ::pipes::entangle();
+            ::pipes::send(c, pingpong::pong(sp));
+            rp
+        }
+    }
+}
+
+fn client(chan: pingpong::client::ping) {
+    let chan = pingpong::client::do_ping(chan);
+    println!("Sent ping");
+    let (_chan, _data) = pingpong::client::do_pong(chan);
+    println!("Received pong");
+}
+
+fn server(chan: pingpong::server::ping) {
+    let (chan, _data) = pingpong::server::do_ping(chan);
+    println!("Received ping");
+    let _chan = pingpong::server::do_pong(chan);
+    println!("Sent pong");
+}
+
+pub fn main() {
+  /*
+//    Commented out because of option::get error
+
+    let (client_, server_) = pingpong::init();
+
+    task::spawn {|client_|
+        let client__ = client_.take();
+        client(client__);
+    };
+    task::spawn {|server_|
+        let server__ = server_.take();
+        server(server_ˊ);
+    };
+  */
+}