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

dart/frog/leg/emitter.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.
 
 /**
  * Generates the code for all used classes in the program. Static fields (even
  * in classes) are ignored, since they can be treated as non-class elements.
  *
  * The code for the containing (used) methods must exist in the [:universe:].
  */
@@ skipping 82 matching lines @@
                      StringBuffer buffer,
                      Set<ClassElement> seenClasses) {
     if (seenClasses.contains(classElement)) return;
     seenClasses.add(classElement);
     ClassElement superClass = classElement.superClass;
     if (superClass !== null) {
       generateClass(classElement.superClass, buffer, seenClasses);
     }
 
     String className = namer.isolatePropertyAccess(classElement);
-    buffer.add('$className = function(');
+    buffer.add('$className = function ${classElement.name}(');
     StringBuffer bodyBuffer = new StringBuffer();
     generateFieldInits(classElement, buffer, bodyBuffer);
     buffer.add(') {\n');
     buffer.add(bodyBuffer);
     buffer.add('};\n');
     if (superClass !== null) {
       addInheritFunctionIfNecessary(buffer);
       String superName = namer.isolatePropertyAccess(superClass);
       buffer.add('${inheritsName}($className, $superName);\n');
     }
@@ skipping 41 matching lines @@
       compileIsolateStatic(buffer,
                            compiler.universe.generatedBailoutCode,
                            namer.isolateBailoutPropertyAccess);
       buffer.add('var ${namer.currentIsolate} = new ${namer.isolate}();\n');
       buffer.add('${namer.currentIsolate}.main();\n');
       compiler.assembledCode = buffer.toString();
     });
     return compiler.assembledCode;
   }
 }