Report errors and warnings for hiding elements, issue 572.

compiler/lib/implementation/regexp.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class JSSyntaxRegExp implements RegExp {
   const JSSyntaxRegExp(
       String this.pattern,
       [bool this.multiLine = false,
        bool this.ignoreCase = false]);
 
@@ skipping 20 matching lines @@
   }
 }
 
 class JSSyntaxMatch implements Match {
   const JSSyntaxMatch(RegExp regexp, String str)
     : this.pattern = regexp, this.str = str;
 
   final String str;
   final Pattern pattern;
 
-  String operator[](int group) {
-    return this.group(group);
+  String operator[](int group_) {
+    return this.group(group_);
   }
 
-  List<String> groups(List<int> groups) {
+  List<String> groups(List<int> groups_) {
     List<String> strings = new List<String>();
-    groups.forEach((int group) {
-      strings.add(this.group(group));
+    groups_.forEach((int group_) {
+      strings.add(this.group(group_));
     });
     return strings;
   }
 
   String group(int nb) native;
 
   int start() native;
 
   int end() native;
 
@@ skipping 73 matching lines @@
 
   bool hasNext() {
     if (_nextMatch != null) return true;
     _nextMatch = _computeNextMatch(_regexp, _str);
     return (_nextMatch != null);
   }
 
   void _jsInit(JSSyntaxRegExp regexp) native;
   Match _computeNextMatch(JSSyntaxRegExp regexp, String str) native;
 }