Emit a compile-time error for uninitialized final variables.

sdk/lib/_internal/compiler/implementation/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 = "";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 863 matching lines @@
 
   static const MessageKind CONST_WITHOUT_INITIALIZER = const MessageKind(
       "Error: A constant variable must be initialized.",
       howToFix: "Try adding an initializer or "
                 "removing the 'const' modifier.",
       examples: const ["""
 void main() {
   const c; // This constant variable must be initialized.
 }"""]);
 
+  static const MessageKind FINAL_WITHOUT_INITIALIZER = const MessageKind(
+      "Error: A final variable must be initialized.",
+      howToFix: "Try adding an initializer or "
+                "removing the 'final' modifier.",
+      examples: const [
+          "class C { static final field; } main() => C.field;"]);
+
   static const MessageKind MEMBER_USES_CLASS_NAME = const MessageKind(
       "Error: Member variable can't have the same name as the class it is "
       "declared in.",
       howToFix: "Try renaming the variable.",
       examples: const ["""
 class A { var A; }
 main() {
   var a = new A();
   a.A = 1;
 }
@@ skipping 475 matching lines @@
 
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }
 
 class CompilationError extends Diagnostic {
   CompilationError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);
 }