Upgrades for latest rust.

Author: metajack

ast.rs

@@ -2,7 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use std::str::ToStr;
 use std::vec;
 
 

parser.rs

@@ -14,7 +14,7 @@
 ///   with v.consume_iter()
 
 
-use std::iterator::Iterator;
+use std::iter::Iterator;
 use std::ascii::StrAsciiExt;
 
 use ast::*;