It's alive (first kernel inference test)

pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart';
 import '../constants/expressions.dart';
@@ skipping 92 matching lines @@
     ConstantValue value =
         _compiler.backend.constants.getConstantValue(constant);
     if (value == null && requireConstant) {
       throw new UnsupportedError(
           'No constant value for ${constant.toStructuredText()}');
     }
     return value;
   }
 
   @override
-  ConstantValue getFieldConstantValue(ir.Field field) {
-    FieldElement element = getField(field);
+  ConstantValue getFieldConstantValue(covariant FieldElement element) {
     if (element.constant != null) {
       return computeConstantValue(element.constant);
     }
     return null;
   }
 
   /// Called to find the corresponding Kernel element for a particular Element
   /// before traversing over it with a Kernel visitor.
   ir.Node getMemberNode(MemberElement originTarget) {
     ir.Node target;
@@ skipping 618 matching lines @@
   TypeMask selectorTypeOf(Selector selector, TypeMask mask) {
     return TypeMaskFactory.inferredTypeForSelector(
         selector, mask, _globalInferenceResults);
   }
 
   TypeMask typeFromNativeBehavior(
       native.NativeBehavior nativeBehavior, ClosedWorld closedWorld) {
     return TypeMaskFactory.fromNativeBehavior(nativeBehavior, closedWorld);
   }
 }