Implement enum types in VM

tests/language/enum_syntax_test.dart

+// Copyright (c) 2014, 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.
+
+// SharedOptions=--enable-enum
+
+// Basic syntax test for enumeration types
+
+import 'package:expect/expect.dart';
+
+
+enum Color { red, orange, yellow, green }
+
+// Additional comma at end of list is ok.
+enum Veggies { carrot, bean, broccolo, }
+
+// Need at least one enumeration identifier.
+enum Nada {}  /// 01: compile-time error
+
+// Duplicate entries are a compile-time error
+enum ComeAgain { ahau, knust, zipfel, knust, gupf }  /// 02: compile-time error
+
+// Enum entries must not collide with implicitly defined members.
+enum ComeAgain { ahau, knust, zipfel, index } /// 03: compile-time error
+
+enum ComeAgain { ahau, knust, zipfel, values } /// 04: compile-time error
+
+enum ComeAgain { ahau, knust, zipfel, toString } /// 05: compile-time error
+
+// Enum entry must not collide with enum type name.
+enum ComeAgain { ahau, knust, zipfel, ComeAgain } /// 06: compile-time error
+
+// Missing comma.
+enum Numbers { one, two, three four, five }  /// 07: compile-time error
+
+// Missing enum type name.
+enum { eins, zwei, drei }  /// 08: compile-time error
+
+// Duplicate name in library scope.
+topLevelFunction() => null;
+enum topLevelFunction { bla, blah }  /// 09: compile-time error
+
+class C {}
+enum C { bla, blah }  /// 10: compile-time error
+
+var zzTop;
+enum zzTop { Billy, Dusty, Frank }  /// 11: compile-time error
+
+// Enum type cannot be super type or interface type.
+class Rainbow extends Color {}  /// 20: compile-time error
+class Rainbow implements Color {}  /// 21: compile-time error
+class Rainbow extends List with Color {}  /// 22: compile-time error
+
+main() {
+  var x = ComeAgain.zipfel;  /// 02: continued
+  var x = ComeAgain.zipfel;  /// 03: continued
+  var x = ComeAgain.zipfel;  /// 04: continued
+  var x = ComeAgain.zipfel;  /// 05: continued
+  var x = ComeAgain.zipfel;  /// 06: continued
+  var x = Numbers.four;  /// 07: continued
+  var x = topLevelFunction.bla;  /// 09: continued
+  var x = C.bla;  /// 10: continued
+  var x = zzTop.Frank;  /// 11: continued
+
+  var x = new Rainbow();  /// 20: continued
+  var x = new Rainbow();  /// 21: continued
+  var x = new Rainbow();  /// 22: continued
+
+  // It is a compile-time error to explicitly instantiate an enum instance.
+  var x = new Color();  /// 30: compile-time error
+}
+