std: Stabilize the prelude module

This commit is an implementation of [RFC 503][rfc] which is a stabilization
story for the prelude. Most of the RFC was directly applied, removing reexports.
Some reexports are kept around, however:

* `range` remains until range syntax has landed to reduce churn.
* `Path` and `GenericPath` remain until path reform lands. This is done to
  prevent many imports of `GenericPath` which will soon be removed.
* All `io` traits remain until I/O reform lands so imports can be rewritten all
  at once to `std::io::prelude::*`.

This is a breaking change because many prelude reexports have been removed, and
the RFC can be consulted for the exact list of removed reexports, as well as to
find the locations of where to import them.

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
[breaking-change]

Closes #20068

src/libstd/thread_local/mod.rs

@@ -37,7 +37,7 @@
 #![macro_escape]
 #![experimental]
 
-use prelude::*;
+use prelude::v1::*;
 
 use cell::UnsafeCell;
 
@@ -258,7 +258,7 @@ impl<T: 'static> Key<T> {
 
 #[cfg(any(target_os = "macos", target_os = "linux"))]
 mod imp {
-    use prelude::*;
+    use prelude::v1::*;
 
     use cell::UnsafeCell;
     use intrinsics;
@@ -396,7 +396,7 @@ mod imp {
 
 #[cfg(not(any(target_os = "macos", target_os = "linux")))]
 mod imp {
-    use prelude::*;
+    use prelude::v1::*;
 
     use cell::UnsafeCell;
     use mem;
@@ -469,8 +469,9 @@ mod imp {
 
 #[cfg(test)]
 mod tests {
-    use prelude::*;
+    use prelude::v1::*;
 
+    use comm::{channel, Sender};
     use cell::UnsafeCell;
     use thread::Thread;
 
@@ -492,7 +493,7 @@ mod tests {
             *f.get() = 2;
         });
         let (tx, rx) = channel();
-        spawn(move|| {
+        let _t = Thread::spawn(move|| {
             FOO.with(|f| unsafe {
                 assert_eq!(*f.get(), 1);
             });
@@ -512,7 +513,7 @@ mod tests {
         });
 
         let (tx, rx) = channel();
-        spawn(move|| unsafe {
+        let _t = Thread::spawn(move|| unsafe {
             let mut tx = Some(tx);
             FOO.with(|f| {
                 *f.get() = Some(Foo(tx.take().unwrap()));
@@ -562,7 +563,7 @@ mod tests {
 
         Thread::spawn(move|| {
             drop(S1);
-        }).join();
+        }).join().ok().unwrap();
     }
 
     #[test]
@@ -580,7 +581,7 @@ mod tests {
 
         Thread::spawn(move|| unsafe {
             K1.with(|s| *s.get() = Some(S1));
-        }).join();
+        }).join().ok().unwrap();
     }
 
     #[test]
@@ -605,7 +606,7 @@ mod tests {
         }
 
         let (tx, rx) = channel();
-        spawn(move|| unsafe {
+        let _t = Thread::spawn(move|| unsafe {
             let mut tx = Some(tx);
             K1.with(|s| *s.get() = Some(S1(tx.take().unwrap())));
         });
@@ -615,7 +616,7 @@ mod tests {
 
 #[cfg(test)]
 mod dynamic_tests {
-    use prelude::*;
+    use prelude::v1::*;
 
     use cell::RefCell;
     use collections::HashMap;

src/libstd/thread_local/scoped.rs

@@ -40,7 +40,7 @@
 
 #![macro_escape]
 
-use prelude::*;
+use prelude::v1::*;
 
 // macro hygiene sure would be nice, wouldn't it?
 #[doc(hidden)] pub use self::imp::KeyInner;
@@ -238,7 +238,7 @@ mod imp {
 #[cfg(test)]
 mod tests {
     use cell::Cell;
-    use prelude::*;
+    use prelude::v1::*;
 
     #[test]
     fn smoke() {