libsyntax: Remove ~self and mut ~self from the language.

This eliminates the last vestige of the `~` syntax.

Instead of `~self`, write `self: Box<TypeOfSelf>`; instead of `mut
~self`, write `mut self: Box<TypeOfSelf>`, replacing `TypeOfSelf` with
the self-type parameter as specified in the implementation.

Closes #13885.

[breaking-change]

src/doc/rust.md

@@ -3864,13 +3864,13 @@ Function parameters are immutable unless declared with `mut`. The
 and `fn f(mut x: Box<int>, y: Box<int>)` declare one mutable variable `x` and
 one immutable variable `y`).
 
-Methods that take either `self` or `~self` can optionally place them in a
+Methods that take either `self` or `Box<Self>` can optionally place them in a
 mutable slot by prefixing them with `mut` (similar to regular arguments):
 
 ~~~
 trait Changer {
     fn change(mut self) -> Self;
-    fn modify(mut ~self) -> Box<Self>;
+    fn modify(mut self: Box<Self>) -> Box<Self>;
 }
 ~~~
 

src/doc/tutorial.md

@@ -1971,7 +1971,7 @@ like any other function, except for the name `self`.
 
 The type of `self` is the type on which the method is implemented,
 or a pointer thereof. As an argument it is written either `self`,
-`&self`, or `~self`.
+`&self`, or `self: TYPE`.
 A caller must in turn have a compatible pointer type to call the method.
 
 ~~~
@@ -1984,7 +1984,7 @@ A caller must in turn have a compatible pointer type to call the method.
 # }
 impl Shape {
     fn draw_reference(&self) { /* ... */ }
-    fn draw_owned(~self) { /* ... */ }
+    fn draw_owned(self: Box<Shape>) { /* ... */ }
     fn draw_value(self) { /* ... */ }
 }
 
@@ -2009,7 +2009,7 @@ to a reference.
 # }
 # impl Shape {
 #    fn draw_reference(&self) { /* ... */ }
-#    fn draw_owned(~self) { /* ... */ }
+#    fn draw_owned(self: Box<Shape>) { /* ... */ }
 #    fn draw_value(self) { /* ... */ }
 # }
 # let s = Circle(Point { x: 1.0, y: 2.0 }, 3.0);

src/libgreen/sched.rs

@@ -180,7 +180,7 @@ impl Scheduler {
 
     // Take a main task to run, and a scheduler to run it in. Create a
     // scheduler task and bootstrap into it.
-    pub fn bootstrap(mut ~self) {
+    pub fn bootstrap(mut self: Box<Scheduler>) {
 
         // Build an Idle callback.
         let cb = box SchedRunner as Box<Callback + Send>;
@@ -224,7 +224,8 @@ impl Scheduler {
 
     // This does not return a scheduler, as the scheduler is placed
     // inside the task.
-    pub fn run(mut ~self, stask: Box<GreenTask>) -> Box<GreenTask> {
+    pub fn run(mut self: Box<Scheduler>, stask: Box<GreenTask>)
+               -> Box<GreenTask> {
 
         // This is unsafe because we need to place the scheduler, with
         // the event_loop inside, inside our task. But we still need a
@@ -271,7 +272,7 @@ impl Scheduler {
     // If we try really hard to do some work, but no work is available to be
     // done, then we fall back to epoll() to block this thread waiting for more
     // work (instead of busy waiting).
-    fn run_sched_once(mut ~self, stask: Box<GreenTask>) {
+    fn run_sched_once(mut self: Box<Scheduler>, stask: Box<GreenTask>) {
         // Make sure that we're not lying in that the `stask` argument is indeed
         // the scheduler task for this scheduler.
         assert!(self.sched_task.is_none());
@@ -349,11 +350,10 @@ impl Scheduler {
     // returns the still-available scheduler. At this point all
     // message-handling will count as a turn of work, and as a result
     // return None.
-    fn interpret_message_queue(mut ~self, stask: Box<GreenTask>,
+    fn interpret_message_queue(mut self: Box<Scheduler>,
+                               stask: Box<GreenTask>,
                                effort: EffortLevel)
-            -> (Box<Scheduler>, Box<GreenTask>, bool)
-    {
-
+                               -> (Box<Scheduler>, Box<GreenTask>, bool) {
         let msg = if effort == DontTryTooHard {
             self.message_queue.casual_pop()
         } else {
@@ -432,7 +432,7 @@ impl Scheduler {
         }
     }
 
-    fn do_work(mut ~self, stask: Box<GreenTask>)
+    fn do_work(mut self: Box<Scheduler>, stask: Box<GreenTask>)
                -> (Box<Scheduler>, Box<GreenTask>, bool) {
         rtdebug!("scheduler calling do work");
         match self.find_work() {
@@ -517,7 +517,7 @@ impl Scheduler {
     // * Task Routing Functions - Make sure tasks send up in the right
     // place.
 
-    fn process_task(mut ~self,
+    fn process_task(mut self: Box<Scheduler>,
                     cur: Box<GreenTask>,
                     mut next: Box<GreenTask>,
                     schedule_fn: SchedulingFn)
@@ -610,7 +610,7 @@ impl Scheduler {
     // cleanup function f, which takes the scheduler and the
     // old task as inputs.
 
-    pub fn change_task_context(mut ~self,
+    pub fn change_task_context(mut self: Box<Scheduler>,
                                mut current_task: Box<GreenTask>,
                                mut next_task: Box<GreenTask>,
                                f: |&mut Scheduler, Box<GreenTask>|)
@@ -693,7 +693,7 @@ impl Scheduler {
 
     // * Context Swapping Helpers - Here be ugliness!
 
-    pub fn resume_task_immediately(~self,
+    pub fn resume_task_immediately(self: Box<Scheduler>,
                                    cur: Box<GreenTask>,
                                    next: Box<GreenTask>)
                                    -> (Box<Scheduler>, Box<GreenTask>) {
@@ -733,7 +733,7 @@ impl Scheduler {
     /// This situation is currently prevented, or in other words it is
     /// guaranteed that this function will not return before the given closure
     /// has returned.
-    pub fn deschedule_running_task_and_then(mut ~self,
+    pub fn deschedule_running_task_and_then(mut self: Box<Scheduler>,
                                             cur: Box<GreenTask>,
                                             f: |&mut Scheduler, BlockedTask|) {
         // Trickier - we need to get the scheduler task out of self
@@ -743,7 +743,7 @@ impl Scheduler {
         self.switch_running_tasks_and_then(cur, stask, f)
     }
 
-    pub fn switch_running_tasks_and_then(~self,
+    pub fn switch_running_tasks_and_then(self: Box<Scheduler>,
                                          cur: Box<GreenTask>,
                                          next: Box<GreenTask>,
                                          f: |&mut Scheduler, BlockedTask|) {
@@ -795,7 +795,9 @@ impl Scheduler {
 
     /// Called by a running task to end execution, after which it will
     /// be recycled by the scheduler for reuse in a new task.
-    pub fn terminate_current_task(mut ~self, cur: Box<GreenTask>) -> ! {
+    pub fn terminate_current_task(mut self: Box<Scheduler>,
+                                  cur: Box<GreenTask>)
+                                  -> ! {
         // Similar to deschedule running task and then, but cannot go through
         // the task-blocking path. The task is already dying.
         let stask = self.sched_task.take_unwrap();
@@ -807,7 +809,9 @@ impl Scheduler {
         fail!("should never return!");
     }
 
-    pub fn run_task(~self, cur: Box<GreenTask>, next: Box<GreenTask>) {
+    pub fn run_task(self: Box<Scheduler>,
+                    cur: Box<GreenTask>,
+                    next: Box<GreenTask>) {
         let (sched, task) =
             self.process_task(cur, next, Scheduler::switch_task);
         task.put_with_sched(sched);
@@ -823,7 +827,7 @@ impl Scheduler {
     /// to introduce some amount of randomness to the scheduler. Currently the
     /// randomness is a result of performing a round of work stealing (which
     /// may end up stealing from the current scheduler).
-    pub fn yield_now(mut ~self, cur: Box<GreenTask>) {
+    pub fn yield_now(mut self: Box<Scheduler>, cur: Box<GreenTask>) {
         // Async handles trigger the scheduler by calling yield_now on the local
         // task, which eventually gets us to here. See comments in SchedRunner
         // for more info on this.
@@ -842,7 +846,7 @@ impl Scheduler {
         }
     }
 
-    pub fn maybe_yield(mut ~self, cur: Box<GreenTask>) {
+    pub fn maybe_yield(mut self: Box<Scheduler>, cur: Box<GreenTask>) {
         // It's possible for sched tasks to possibly call this function, and it
         // just means that they're likely sending on channels (which
         // occasionally call this function). Sched tasks follow different paths

src/libgreen/simple.rs

@@ -27,7 +27,9 @@ struct SimpleTask {
 impl Runtime for SimpleTask {
     // Implement the simple tasks of descheduling and rescheduling, but only in
     // a simple number of cases.
-    fn deschedule(mut ~self, times: uint, mut cur_task: Box<Task>,
+    fn deschedule(mut self: Box<SimpleTask>,
+                  times: uint,
+                  mut cur_task: Box<Task>,
                   f: |BlockedTask| -> Result<(), BlockedTask>) {
         assert!(times == 1);
 
@@ -54,7 +56,7 @@ impl Runtime for SimpleTask {
         }
         Local::put(cur_task);
     }
-    fn reawaken(mut ~self, mut to_wake: Box<Task>) {
+    fn reawaken(mut self: Box<SimpleTask>, mut to_wake: Box<Task>) {
         let me = &mut *self as *mut SimpleTask;
         to_wake.put_runtime(self);
         unsafe {
@@ -69,9 +71,9 @@ impl Runtime for SimpleTask {
     // purpose. A "simple task" is just that, a very simple task that can't
     // really do a whole lot. The only purpose of the task is to get us off our
     // feet and running.
-    fn yield_now(~self, _cur_task: Box<Task>) { fail!() }
-    fn maybe_yield(~self, _cur_task: Box<Task>) { fail!() }
-    fn spawn_sibling(~self,
+    fn yield_now(self: Box<SimpleTask>, _cur_task: Box<Task>) { fail!() }
+    fn maybe_yield(self: Box<SimpleTask>, _cur_task: Box<Task>) { fail!() }
+    fn spawn_sibling(self: Box<SimpleTask>,
                      _cur_task: Box<Task>,
                      _opts: TaskOpts,
                      _f: proc():Send) {
@@ -80,7 +82,7 @@ impl Runtime for SimpleTask {
     fn local_io<'a>(&'a mut self) -> Option<rtio::LocalIo<'a>> { None }
     fn stack_bounds(&self) -> (uint, uint) { fail!() }
     fn can_block(&self) -> bool { true }
-    fn wrap(~self) -> Box<Any> { fail!() }
+    fn wrap(self: Box<SimpleTask>) -> Box<Any> { fail!() }
 }
 
 pub fn task() -> Box<Task> {

src/libgreen/task.rs

@@ -265,7 +265,7 @@ impl GreenTask {
 
     // Runtime glue functions and helpers
 
-    pub fn put_with_sched(mut ~self, sched: Box<Scheduler>) {
+    pub fn put_with_sched(mut self: Box<GreenTask>, sched: Box<Scheduler>) {
         assert!(self.sched.is_none());
         self.sched = Some(sched);
         self.put();
@@ -276,18 +276,18 @@ impl GreenTask {
         self.task = Some(task);
     }
 
-    pub fn swap(mut ~self) -> Box<Task> {
+    pub fn swap(mut self: Box<GreenTask>) -> Box<Task> {
         let mut task = self.task.take_unwrap();
         task.put_runtime(self);
         return task;
     }
 
-    pub fn put(~self) {
+    pub fn put(self: Box<GreenTask>) {
         assert!(self.sched.is_some());
         Local::put(self.swap());
     }
 
-    fn terminate(mut ~self) -> ! {
+    fn terminate(mut self: Box<GreenTask>) -> ! {
         let sched = self.sched.take_unwrap();
         sched.terminate_current_task(self)
     }
@@ -311,7 +311,7 @@ impl GreenTask {
     // *not* a cheap operation to clone a handle. Until the day comes that we
     // need to optimize this, a lock should do just fine (it's completely
     // uncontended except for when the task is rescheduled).
-    fn reawaken_remotely(mut ~self) {
+    fn reawaken_remotely(mut self: Box<GreenTask>) {
         unsafe {
             let mtx = &mut self.nasty_deschedule_lock as *mut NativeMutex;
             let handle = self.handle.get_mut_ref() as *mut SchedHandle;
@@ -322,19 +322,21 @@ impl GreenTask {
 }
 
 impl Runtime for GreenTask {
-    fn yield_now(mut ~self, cur_task: Box<Task>) {
+    fn yield_now(mut self: Box<GreenTask>, cur_task: Box<Task>) {
         self.put_task(cur_task);
         let sched = self.sched.take_unwrap();
         sched.yield_now(self);
     }
 
-    fn maybe_yield(mut ~self, cur_task: Box<Task>) {
+    fn maybe_yield(mut self: Box<GreenTask>, cur_task: Box<Task>) {
         self.put_task(cur_task);
         let sched = self.sched.take_unwrap();
         sched.maybe_yield(self);
     }
 
-    fn deschedule(mut ~self, times: uint, cur_task: Box<Task>,
+    fn deschedule(mut self: Box<GreenTask>,
+                  times: uint,
+                  cur_task: Box<Task>,
                   f: |BlockedTask| -> Result<(), BlockedTask>) {
         self.put_task(cur_task);
         let mut sched = self.sched.take_unwrap();
@@ -383,7 +385,7 @@ impl Runtime for GreenTask {
         }
     }
 
-    fn reawaken(mut ~self, to_wake: Box<Task>) {
+    fn reawaken(mut self: Box<GreenTask>, to_wake: Box<Task>) {
         self.put_task(to_wake);
         assert!(self.sched.is_none());
 
@@ -434,7 +436,7 @@ impl Runtime for GreenTask {
         }
     }
 
-    fn spawn_sibling(mut ~self,
+    fn spawn_sibling(mut self: Box<GreenTask>,
                      cur_task: Box<Task>,
                      opts: TaskOpts,
                      f: proc():Send) {
@@ -471,7 +473,7 @@ impl Runtime for GreenTask {
 
     fn can_block(&self) -> bool { false }
 
-    fn wrap(~self) -> Box<Any> { self as Box<Any> }
+    fn wrap(self: Box<GreenTask>) -> Box<Any> { self as Box<Any> }
 }
 
 #[cfg(test)]

src/libnative/io/net.rs

@@ -484,7 +484,8 @@ impl TcpListener {
 }
 
 impl rtio::RtioTcpListener for TcpListener {
-    fn listen(~self) -> IoResult<Box<rtio::RtioTcpAcceptor + Send>> {
+    fn listen(self: Box<TcpListener>)
+              -> IoResult<Box<rtio::RtioTcpAcceptor + Send>> {
         self.native_listen(128).map(|a| {
             box a as Box<rtio::RtioTcpAcceptor + Send>
         })

src/libnative/io/pipe_unix.rs

@@ -229,7 +229,8 @@ impl UnixListener {
 }
 
 impl rtio::RtioUnixListener for UnixListener {
-    fn listen(~self) -> IoResult<Box<rtio::RtioUnixAcceptor + Send>> {
+    fn listen(self: Box<UnixListener>)
+              -> IoResult<Box<rtio::RtioUnixAcceptor + Send>> {
         self.native_listen(128).map(|a| {
             box a as Box<rtio::RtioUnixAcceptor + Send>
         })

src/libnative/io/pipe_win32.rs

@@ -588,7 +588,8 @@ impl Drop for UnixListener {
 }
 
 impl rtio::RtioUnixListener for UnixListener {
-    fn listen(~self) -> IoResult<Box<rtio::RtioUnixAcceptor + Send>> {
+    fn listen(self: Box<UnixListener>)
+              -> IoResult<Box<rtio::RtioUnixAcceptor + Send>> {
         self.native_listen().map(|a| {
             box a as Box<rtio::RtioUnixAcceptor + Send>
         })

src/libnative/task.rs

@@ -131,21 +131,21 @@ struct Ops {
 }
 
 impl rt::Runtime for Ops {
-    fn yield_now(~self, mut cur_task: Box<Task>) {
+    fn yield_now(self: Box<Ops>, mut cur_task: Box<Task>) {
         // put the task back in TLS and then invoke the OS thread yield
         cur_task.put_runtime(self);
         Local::put(cur_task);
         Thread::yield_now();
     }
 
-    fn maybe_yield(~self, mut cur_task: Box<Task>) {
+    fn maybe_yield(self: Box<Ops>, mut cur_task: Box<Task>) {
         // just put the task back in TLS, on OS threads we never need to
         // opportunistically yield b/c the OS will do that for us (preemption)
         cur_task.put_runtime(self);
         Local::put(cur_task);
     }
 
-    fn wrap(~self) -> Box<Any> {
+    fn wrap(self: Box<Ops>) -> Box<Any> {
         self as Box<Any>
     }
 
@@ -192,7 +192,9 @@ impl rt::Runtime for Ops {
     // `awoken` field which indicates whether we were actually woken up via some
     // invocation of `reawaken`. This flag is only ever accessed inside the
     // lock, so there's no need to make it atomic.
-    fn deschedule(mut ~self, times: uint, mut cur_task: Box<Task>,
+    fn deschedule(mut self: Box<Ops>,
+                  times: uint,
+                  mut cur_task: Box<Task>,
                   f: |BlockedTask| -> Result<(), BlockedTask>) {
         let me = &mut *self as *mut Ops;
         cur_task.put_runtime(self);
@@ -250,7 +252,7 @@ impl rt::Runtime for Ops {
 
     // See the comments on `deschedule` for why the task is forgotten here, and
     // why it's valid to do so.
-    fn reawaken(mut ~self, mut to_wake: Box<Task>) {
+    fn reawaken(mut self: Box<Ops>, mut to_wake: Box<Task>) {
         unsafe {
             let me = &mut *self as *mut Ops;
             to_wake.put_runtime(self);
@@ -261,7 +263,7 @@ impl rt::Runtime for Ops {
         }
     }
 
-    fn spawn_sibling(~self,
+    fn spawn_sibling(self: Box<Ops>,
                      mut cur_task: Box<Task>,
                      opts: TaskOpts,
                      f: proc():Send) {