Record names of constructors and use that to implement Object.toString.

dart/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 285 matching lines @@
 
 
 bool isInt(var v) {
   return JS("bool", @"($0 | 0) === $1", v, v);
 }
 
 class int {}
 class double {}
 class String {}
 class bool {}
-class Object {}
+class Object {
+  toString() => "[Instance of '${JS('String', @'this.constructor.name')}']";

[Lasse Reichstein, 2012/01/11 09:49:16]

and @'this.constructor.$name' here.

+}
 class List<T> {
   static void _checkConstructorInput(n) {
     // TODO(ngeoffray): Inline once we support optional parameters or
     // bailout.
     if (!isInt(n)) throw "Invalid argument";
     if (n < 0) throw "Negative size";
   }
 
   factory List(n) {
     // TODO(ngeoffray): Adjust to optional parameters.
@@ skipping 63 matching lines @@
     } else {
       return
         JS("num", @"Math.floor($0 + (Date.now() - $1))", elapsedMs, startMs);
     }
   }
 
   int frequency() {
     return 1000;
   }
 }