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]

src/libstd/io/stdio.rs

@@ -34,6 +34,7 @@ use libc;
 use kinds::Send;
 use mem::replace;
 use option::{Option, Some, None};
+use owned::Box;
 use prelude::drop;
 use result::{Ok, Err};
 use rt;
@@ -71,8 +72,8 @@ use str::StrSlice;
 // tl;dr; TTY works on everything but when windows stdout is redirected, in that
 //        case pipe also doesn't work, but magically file does!
 enum StdSource {
-    TTY(~RtioTTY:Send),
-    File(~RtioFileStream:Send),
+    TTY(Box<RtioTTY:Send>),
+    File(Box<RtioFileStream:Send>),
 }
 
 fn src<T>(fd: libc::c_int, readable: bool, f: |StdSource| -> T) -> T {
@@ -153,10 +154,9 @@ pub fn stderr_raw() -> StdWriter {
     src(libc::STDERR_FILENO, false, |src| StdWriter { inner: src })
 }
 
-fn reset_helper(w: ~Writer:Send,
-                f: |&mut Task, ~Writer:Send| -> Option<~Writer:Send>)
-    -> Option<~Writer:Send>
-{
+fn reset_helper(w: Box<Writer:Send>,
+                f: |&mut Task, Box<Writer:Send>| -> Option<Box<Writer:Send>>)
+                -> Option<Box<Writer:Send>> {
     let mut t = Local::borrow(None::<Task>);
     // Be sure to flush any pending output from the writer
     match f(&mut *t, w) {
@@ -178,7 +178,7 @@ fn reset_helper(w: ~Writer:Send,
 ///
 /// Note that this does not need to be called for all new tasks; the default
 /// output handle is to the process's stdout stream.
-pub fn set_stdout(stdout: ~Writer:Send) -> Option<~Writer:Send> {
+pub fn set_stdout(stdout: Box<Writer:Send>) -> Option<Box<Writer:Send>> {
     reset_helper(stdout, |t, w| replace(&mut t.stdout, Some(w)))
 }
 
@@ -190,7 +190,7 @@ pub fn set_stdout(stdout: ~Writer:Send) -> Option<~Writer:Send> {
 ///
 /// Note that this does not need to be called for all new tasks; the default
 /// output handle is to the process's stderr stream.
-pub fn set_stderr(stderr: ~Writer:Send) -> Option<~Writer:Send> {
+pub fn set_stderr(stderr: Box<Writer:Send>) -> Option<Box<Writer:Send>> {
     reset_helper(stderr, |t, w| replace(&mut t.stderr, Some(w)))
 }
 
@@ -205,7 +205,7 @@ pub fn set_stderr(stderr: ~Writer:Send) -> Option<~Writer:Send> {
 //      })
 //  })
 fn with_task_stdout(f: |&mut Writer| -> IoResult<()> ) {
-    let task: Option<~Task> = Local::try_take();
+    let task: Option<Box<Task>> = Local::try_take();
     let result = match task {
         Some(mut task) => {
             // Printing may run arbitrary code, so ensure that the task is in
@@ -216,7 +216,7 @@ fn with_task_stdout(f: |&mut Writer| -> IoResult<()> ) {
             Local::put(task);
 
             if my_stdout.is_none() {
-                my_stdout = Some(box stdout() as ~Writer:Send);
+                my_stdout = Some(box stdout() as Box<Writer:Send>);
             }
             let ret = f(*my_stdout.get_mut_ref());