Implemented class literals in the VM.

tests/language/class_literal_test.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.
 
-// Test that classes cannot be used as expressions.
+// Test class literal expressions.
 
 class Class {
   static fisk() => 42;
 }
 
 foo(x) {}
 
 main() {
   if (false) {
-    Class; /// 01: compile-time error
     Class(); /// 02: compile-time error
-    Class.method(); /// 03: static type warning
-    Class.field; /// 04: static type warning
     Class[0]; /// 05: compile-time error
-    var x = Class; /// 06: compile-time error
     var x = Class(); /// 07: compile-time error
-    var x = Class.method(); /// 08: static type warning
-    var x = Class.field; /// 09: static type warning
     var x = Class[0]; /// 10: compile-time error
     var x = Class[0].field; /// 11: compile-time error
     var x = Class[0].method(); /// 12: compile-time error
-    foo(Class); /// 13: compile-time error
     foo(Class()); /// 14: compile-time error
-    foo(Class.method()); /// 15: static type warning
-    foo(Class.field); /// 16: static type warning
     foo(Class[0]); /// 17: compile-time error
     foo(Class[0].field); /// 18: compile-time error
     foo(Class[0].method()); /// 19: compile-time error
-    Class == null; /// 20: compile-time error
-    null == Class; /// 21: compile-time error
     Class[0] = 91; /// 22: compile-time error
     Class++; /// 23: compile-time error
     ++Class; /// 24: compile-time error
-    Class / 3; /// 25: compile-time error
-    Class += 3; /// 26: compile-time error
     Class[0] += 3; /// 27: compile-time error
     ++Class[0]; /// 28: compile-time error
     Class[0]++; /// 29: compile-time error
   }
   Expect.equals(42, Class.fisk());
   Expect.equals(null, foo(Class.fisk()));
+  
+  // Verify references to a class literal are allowed.
+  Class;
+  var x = Class;
+  foo(Class);
+  Expect.isFalse(Class == null);
+
+  // Verify that dereferencing a class literal is a runtime error.
+  Expect.throws(() { Class.method(); }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { Class.field; }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { var x = Class.method(); }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { var x = Class.field; }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { foo(Class.method()); }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { foo(Class.field); }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { Class / 3; }, (e) => e is NoSuchMethodError);
+  Expect.throws(() { Class += 3; }, (e) => e is NoSuchMethodError);
+
+  // Verify that a class literal is its runtimeType.
+  var obj = new Class();
+  Expect.identical(Class, obj.runtimeType);
+  
+  // Verify that a class literal isn't a string literal.
+  Expect.notEquals(Class, "Class");
+   
+  // Verify toString() works for class literals.
+  Expect.equals((Class).toString(), "Class");
+  var y = Class;
+  Expect.equals(y.toString(), "Class");
+  
+  Expect.throws(() { Class.toString(); }, (e) => e is NoSuchMethodError);
 }