Issue 988: Compile time error missing for const class / non-final instance variables

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 46 matching lines @@
   int end() native;
 
   groupCount() native;
 
   static _new(RegExp regexp, String str) native {
     return new JSSyntaxMatch(regexp, str);
   }
 }
 
 class _LazyAllMatches implements Collection<Match> {
-  JSSyntaxRegExp _regexp;
-  String _str;
+  final JSSyntaxRegExp _regexp;
+  final String _str;
 
   const _LazyAllMatches(this._regexp, this._str);
 
   void forEach(void f(Match match)) {
     for (Match match in this) {
       f(match);
     }
   }
 
   Collection<Match> filter(bool f(Match match)) {
@@ skipping 53 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;
 }