It is not an error anymore to leave an instance final field uninitialized.

runtime/vm/parser.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 2143 matching lines @@
     ErrorMsg(field_pos, "unresolved reference to instance field '%s'",
              field_name.ToCString());
   }
   CheckDuplicateFieldInit(field_pos, initialized_fields, &field);
   AstNode* instance = new LoadLocalNode(field_pos, receiver);
   EnsureExpressionTemp();
   return new StoreInstanceFieldNode(field_pos, instance, field, init_expr);
 }
 
 
-void Parser::CheckConstFieldsInitialized(const Class& cls) {
+void Parser::CheckFieldsInitialized(const Class& cls) {
   const Array& fields = Array::Handle(cls.fields());
   Field& field = Field::Handle();
   SequenceNode* initializers = current_block_->statements;
   for (int field_num = 0; field_num < fields.Length(); field_num++) {
     field ^= fields.At(field_num);
     if (field.is_static()) {
       continue;
     }
 
     bool found = false;
     for (int i = 0; i < initializers->length(); i++) {
       found = false;
       if (initializers->NodeAt(i)->IsStoreInstanceFieldNode()) {
         StoreInstanceFieldNode* initializer =
             initializers->NodeAt(i)->AsStoreInstanceFieldNode();
         if (initializer->field().raw() == field.raw()) {
           found = true;
           break;
         }
       }
     }
 
     if (found) continue;
 
-    if (field.is_final()) {
-      ErrorMsg("final field '%s' not initialized",
-               String::Handle(field.name()).ToCString());
-    } else {
-      field.UpdateCid(kNullCid);
-      field.UpdateLength(Field::kNoFixedLength);
-    }
+    field.UpdateCid(kNullCid);
+    field.UpdateLength(Field::kNoFixedLength);
   }
 }
 
 
 AstNode* Parser::ParseExternalInitializedField(const Field& field) {
   // Only use this function if the initialized field originates
   // from a different class. We need to save and restore current
   // class, library, and token stream (script).
   ASSERT(current_class().raw() != field.origin());
   const Class& saved_class = Class::Handle(current_class().raw());
@@ skipping 111 matching lines @@
         init_statement = ParseInitializer(cls, receiver, initialized_fields);
       }
       current_block_->statements->Add(init_statement);
     } while (CurrentToken() == Token::kCOMMA);
   }
   if (!super_init_seen) {
     // Generate implicit super() if we haven't seen an explicit super call
     // or constructor redirection.
     GenerateSuperConstructorCall(cls, receiver, NULL);
   }
-  CheckConstFieldsInitialized(cls);
+  CheckFieldsInitialized(cls);
 }
 
 
 void Parser::ParseConstructorRedirection(const Class& cls,
                                          LocalVariable* receiver) {
   TRACE_PARSER("ParseConstructorRedirection");
   ExpectToken(Token::kCOLON);
   ASSERT(CurrentToken() == Token::kTHIS);
   const intptr_t call_pos = TokenPos();
   ConsumeToken();
@@ skipping 93 matching lines @@
       LocalVariable* param = new LocalVariable(
           ctor_pos,
           String::ZoneHandle(func.ParameterNameAt(i)),
           Type::ZoneHandle(Type::DynamicType()));
       current_block_->scope->AddVariable(param);
       forwarding_args->Add(new LoadLocalNode(ctor_pos, param));
     }
   }
 
   GenerateSuperConstructorCall(current_class(), receiver, forwarding_args);
-  CheckConstFieldsInitialized(current_class());
+  CheckFieldsInitialized(current_class());
 
   // Empty constructor body.
   SequenceNode* statements = CloseBlock();
   return statements;
 }
 
 
 void Parser::CheckRecursiveInvocation() {
   const GrowableObjectArray& pending_functions =
       GrowableObjectArray::Handle(
@@ skipping 8172 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart