Handle signature types and fields in kernel_impact

pkg/compiler/lib/src/resolution/resolution.dart

 // 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.
 
 library dart2js.resolution;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 382 matching lines @@
         if (result.isConstant) {
           element.constant = result.constant;
         }
       } else if (modifiers.isConst) {
         reporter.reportErrorMessage(
             element, MessageKind.CONST_WITHOUT_INITIALIZER);
       } else if (modifiers.isFinal && !element.isInstanceMember) {
         reporter.reportErrorMessage(
             element, MessageKind.FINAL_WITHOUT_INITIALIZER);
       } else {
-        // TODO(johnniwinther): Register a feature instead.
-        registry.registerTypeUse(new TypeUse.instantiation(coreTypes.nullType));
+        registry.registerFeature(Feature.FIELD_WITHOUT_INITIALIZER);
       }
 
       if (Elements.isStaticOrTopLevelField(element)) {
         visitor.addDeferredAction(element, () {
           if (element.modifiers.isConst) {
             element.constant = constantCompiler.compileConstant(element);
           } else {
             element.constant = constantCompiler.compileVariable(element);
           }
         });
@@ skipping 708 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }