librustc: Implement the proc type as sugar for ~once fn and proc

notation for closures, and disable the feature gate for `once fn` if
used with the `~` sigil.

src/test/run-pass/closure-reform.rs

@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+fn call_it(f: proc(~str) -> ~str) {
+    println(f(~"Fred"))
+}
+
+pub fn main() {
+    let greeting = ~"Hi ";
+    do call_it |s| {
+        greeting + s
+    }
+
+    let greeting = ~"Hello ";
+    call_it(proc(s) {
+        greeting + s
+    });
+
+    let greeting = ~"Goodbye ";
+    call_it(proc(s) greeting + s);
+
+    let greeting = ~"How's life, ";
+    call_it(proc(s: ~str) -> ~str {
+        greeting + s
+    });
+}
+

src/test/run-pass/core-run-destroy.rs

@@ -64,14 +64,14 @@ fn test_destroy_actually_kills(force: bool) {
         use std::libc::consts::os::extra::{FALSE, PROCESS_QUERY_INFORMATION, STILL_ACTIVE };
 
         unsafe {
-            let proc = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid as DWORD);
-            if proc.is_null() {
+            let process = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid as DWORD);
+            if process.is_null() {
                 return false;
             }
-            // proc will be non-null if the process is alive, or if it died recently
+            // process will be non-null if the process is alive, or if it died recently
             let mut status = 0;
-            GetExitCodeProcess(proc, &mut status);
-            CloseHandle(proc);
+            GetExitCodeProcess(process, &mut status);
+            CloseHandle(process);
             return status == STILL_ACTIVE;
         }
     }