auto merge of #12815 : alexcrichton/rust/chan-rename, r=brson

* Chan<T> => Sender<T>
* Port<T> => Receiver<T>
* Chan::new() => channel()
* constructor returns (Sender, Receiver) instead of (Receiver, Sender)
* local variables named `port` renamed to `rx`
* local variables named `chan` renamed to `tx`

Closes #11765

src/librustdoc/test.rs

@@ -116,12 +116,12 @@ fn runtest(test: &str, cratename: &str, libs: HashSet<Path>, should_fail: bool,
     //
     // The basic idea is to not use a default_handler() for rustc, and then also
     // not print things by default to the actual stderr.
-    let (p, c) = Chan::new();
-    let w1 = io::ChanWriter::new(c);
+    let (tx, rx) = channel();
+    let w1 = io::ChanWriter::new(tx);
     let w2 = w1.clone();
     let old = io::stdio::set_stderr(~w1);
     spawn(proc() {
-        let mut p = io::PortReader::new(p);
+        let mut p = io::ChanReader::new(rx);
         let mut err = old.unwrap_or(~io::stderr() as ~Writer);
         io::util::copy(&mut p, &mut err).unwrap();
     });