Enable enums by default.

pkg/compiler/lib/src/warnings.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.
 
 part of dart2js;
 
 const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 794 matching lines @@
 main() => new C();
 """, """
 typedef C = Object with String;
 
 main() => new C();
 """]);
 
   static const MessageKind CANNOT_EXTEND_ENUM = const MessageKind(
       "Class '#{className}' can't extend the type '#{enumType}' because "
       "it is declared by an enum.",
-      options: const ['--enable-enum'],
       howToFix: "Try making '#{enumType}' a normal class or removing the "
         "'extends' clause.",
       examples: const ["""
 enum Enum { A }
 class B extends Enum {}
 main() => new B();"""]);
 
   static const MessageKind CANNOT_IMPLEMENT_ENUM = const MessageKind(
       "Class '#{className}' can't implement the type '#{enumType}' "
       "because it is declared by an enum.",
-      options: const ['--enable-enum'],
       howToFix: "Try making '#{enumType}' a normal class or removing the "
         "type from the 'implements' clause.",
       examples: const ["""
 enum Enum { A }
 class B implements Enum {}
 main() => new B();"""]);
 
   static const MessageKind CANNOT_MIXIN_ENUM = const MessageKind(
       "Class '#{className}' can't mixin the type '#{enumType}' because it "
       "is declared by an enum.",
-      options: const ['--enable-enum'],
       howToFix: "Try making '#{enumType}' a normal class or removing the "
         "type from the 'with' clause.",
       examples: const ["""
 enum Enum { A }
 class B extends Object with Enum {}
 main() => new B();"""]);
 
   static const MessageKind CANNOT_INSTANTIATE_ENUM = const MessageKind(
       "Enum type '#{enumName}' cannot be instantiated.",
-      options: const ['--enable-enum'],
       howToFix: "Try making '#{enumType}' a normal class or use an enum "
                 "constant.",
       examples: const ["""
 enum Enum { A }
 main() => new Enum(0);""", """
 enum Enum { A }
 main() => const Enum(0);"""]);
 
   static const MessageKind EMPTY_ENUM_DECLARATION = const MessageKind(
       "Enum '#{enumName}' must contain at least one value.",
-      options: const ['--enable-enum'],
       howToFix: "Try adding an enum constant or making #{enumName} a "
                 "normal class.",
       examples: const ["""
 enum Enum {}
 main() { Enum e; }"""]);
 
   static const MessageKind MISSING_ENUM_CASES = const MessageKind(
       "Missing enum constants in switch statement: #{enumValues}.",
-      options: const ['--enable-enum'],
       howToFix: "Try adding the missing constants or a default case.",
       examples: const ["""
 enum Enum { A, B }
 main() {
   switch (Enum.A) {
   case Enum.B: break;
   }
 }""", """
 enum Enum { A, B, C }
 main() {
@@ skipping 1196 matching lines @@
       "#{warnings} warning(s) suppressed in #{uri}.");
 
   static const MessageKind HIDDEN_HINTS = const MessageKind(
       "#{hints} hint(s) suppressed in #{uri}.");
 
   static const MessageKind PREAMBLE = const MessageKind(
     "When run on the command-line, the compiled output might"
     " require a preamble file located in:\n"
     "  <sdk>/lib/_internal/compiler/js_lib/preambles.");
 
-
-  static const MessageKind EXPERIMENTAL_ENUMS = const MessageKind(
-      "Experimental language feature 'enums' is not supported.",
-      howToFix: "Use option '--enable-enum' to use enum declarations.",
-      examples: const ["""
-enum Enum { A, B, C }
-main() => print(Enum.A);
-"""]);
-
   static const MessageKind EXPERIMENTAL_ASYNC_AWAIT = const MessageKind(
       "Experimental language feature 'async/await' is not supported.");
 
   static const MessageKind INVALID_STARRED_KEYWORD = const MessageKind(
       "Invalid '#{keyword}' keyword.",
       options: const ['--enable-async'],
       howToFix: "Try removing whitespace between '#{keyword}' and '*'.",
       examples: const [
         "main() async * {}",
         "main() sync * {}",
@@ skipping 351 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }