librustc: Remove `~EXPR`, `~TYPE`, and `~PAT` from the language, except

for `~str`/`~[]`.

Note that `~self` still remains, since I forgot to add support for
`Box<self>` before the snapshot.

How to update your code:

* Instead of `~EXPR`, you should write `box EXPR`.

* Instead of `~TYPE`, you should write `Box<Type>`.

* Instead of `~PATTERN`, you should write `box PATTERN`.

[breaking-change]

1 files changed, 15 insertions, 12 deletions

diff --git a/src/libnative/task.rs b/src/libnative/task.rs
index 512080e4204..d5b02dc007b 100644
--- a/src/libnative/task.rs
+++ b/src/libnative/task.rs
@@ -31,7 +31,7 @@ use io;
 use task;
 
 /// Creates a new Task which is ready to execute as a 1:1 task.
-pub fn new(stack_bounds: (uint, uint)) -> ~Task {
+pub fn new(stack_bounds: (uint, uint)) -> Box<Task> {
     let mut task = box Task::new();
     let mut ops = ops();
     ops.stack_bounds = stack_bounds;
@@ -39,7 +39,7 @@ pub fn new(stack_bounds: (uint, uint)) -> ~Task {
     return task;
 }
 
-fn ops() -> ~Ops {
+fn ops() -> Box<Ops> {
     box Ops {
         lock: unsafe { NativeMutex::new() },
         awoken: false,
@@ -119,22 +119,22 @@ struct Ops {
 }
 
 impl rt::Runtime for Ops {
-    fn yield_now(~self, mut cur_task: ~Task) {
+    fn yield_now(~self, 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: ~Task) {
+    fn maybe_yield(~self, 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) -> ~Any {
-        self as ~Any
+    fn wrap(~self) -> Box<Any> {
+        self as Box<Any>
     }
 
     fn stack_bounds(&self) -> (uint, uint) { self.stack_bounds }
@@ -159,8 +159,8 @@ impl rt::Runtime for Ops {
     // from the wakeup thread back to this thread about the task pointer, and
     // there's really no need to. In order to get around this, we cast the task
     // to a `uint` which is then used at the end of this function to cast back
-    // to a `~Task` object. Naturally, this looks like it violates ownership
-    // semantics in that there may be two `~Task` objects.
+    // to a `Box<Task>` object. Naturally, this looks like it violates
+    // ownership semantics in that there may be two `Box<Task>` objects.
     //
     // The fun part is that the wakeup half of this implementation knows to
     // "forget" the task on the other end. This means that the awakening half of
@@ -180,7 +180,7 @@ 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: ~Task,
+    fn deschedule(mut ~self, times: uint, mut cur_task: Box<Task>,
                   f: |BlockedTask| -> Result<(), BlockedTask>) {
         let me = &mut *self as *mut Ops;
         cur_task.put_runtime(self);
@@ -238,7 +238,7 @@ 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: ~Task) {
+    fn reawaken(mut ~self, mut to_wake: Box<Task>) {
         unsafe {
             let me = &mut *self as *mut Ops;
             to_wake.put_runtime(self);
@@ -249,7 +249,10 @@ impl rt::Runtime for Ops {
         }
     }
 
-    fn spawn_sibling(~self, mut cur_task: ~Task, opts: TaskOpts, f: proc():Send) {
+    fn spawn_sibling(~self,
+                     mut cur_task: Box<Task>,
+                     opts: TaskOpts,
+                     f: proc():Send) {
         cur_task.put_runtime(self);
         Local::put(cur_task);
 
@@ -342,7 +345,7 @@ mod tests {
         let (tx, rx) = channel();
         spawn(proc() {
             spawn(proc() {
-                let mut task: ~Task = Local::take();
+                let mut task: Box<Task> = Local::take();
                 match task.maybe_take_runtime::<Ops>() {
                     Some(ops) => {
                         task.put_runtime(ops);