Implement field parameter for generative constructors.

frog/leg/lib/core.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.
 
 void print(var obj) {
   obj = obj.toString();
   var hasConsole = JS("bool", @"typeof console == 'object'");
   if (hasConsole) {
     JS("void", @"console.log($0)", obj);
   } else {
@@ skipping 318 matching lines @@
     // TODO(ngeoffray): Adjust to optional parameters.
     if (JS("bool", @"$0 === (void 0)", n)) return JS("Object", @"new Array()");
     _checkConstructorInput(n);
     return JS("Object", @"new Array($0)", n);
   }
 }
 
 class ListIterator<T> /* implements Iterator<T> */ {
   int i;
   List<T> list;
-  ListIterator(List<T> list) : this.list = list, i = 0;
+  ListIterator(List<T> this.list) : i = 0;
   bool hasNext() => i < JS("int", @"$0.length", list);
   T next() {
     var value = JS("Object", @"$0[$1]", list, i);
     i += 1;
     return value;
   }
 }
 
 class Expect {
   static void equals(var expected, var actual) {
@@ skipping 55 matching lines @@
     } else {
       return
         JS("num", @"Math.floor($0 + (Date.now() - $1))", elapsedMs, startMs);
     }
   }
 
   int frequency() {
     return 1000;
   }
 }