Fix kernel/visitor_test

tests/compiler/dart2js/kernel/impact_test.dart

Index: tests/compiler/dart2js/kernel/impact_test.dart
diff --git a/tests/compiler/dart2js/kernel/impact_test.dart b/tests/compiler/dart2js/kernel/impact_test.dart
index 60a95b9147afe7caf127a759ef6d34a42bd45e77..4d176adfd4f9388737e5009b1a981519bb533f89 100644
--- a/tests/compiler/dart2js/kernel/impact_test.dart
+++ b/tests/compiler/dart2js/kernel/impact_test.dart
@@ -4,16 +4,17 @@
 
 library dart2js.kernel.impact_test;
 
-import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/common/names.dart';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/compiler.dart';
+import 'package:compiler/src/constants/expressions.dart';
 import 'package:compiler/src/dart_types.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/resolution/registry.dart';
+import 'package:compiler/src/resolution/tree_elements.dart';
 import 'package:compiler/src/ssa/kernel_impact.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
 import 'package:compiler/src/universe/call_structure.dart';
@@ -151,6 +152,7 @@ main() {
   testDefaultValuesNamed();
   testFieldInitializer1();
   testFieldInitializer2();
+  testFieldInitializer3();
   testInstanceFieldWithInitializer();
   testInstanceFieldTyped();
   testThisInitializer();
@@ -478,6 +480,15 @@ class ClassFieldInitializer2 {
   ClassFieldInitializer2(value) : field = value;
 }
 testFieldInitializer2() => new ClassFieldInitializer2(42);
+class ClassFieldInitializer3 {
+  var field;
+  ClassFieldInitializer3.a();
+  ClassFieldInitializer3.b(value) : field = value;
+}
+testFieldInitializer3() {
+  new ClassFieldInitializer3.a();
+  new ClassFieldInitializer3.b(42);
+}
 class ClassInstanceFieldWithInitializer {
   var field = false;
 }
@@ -671,6 +682,38 @@ ResolutionImpact laxImpact(
   impact.mapLiterals.forEach(builder.registerMapLiteral);
   for (Feature feature in impact.features) {
     switch (feature) {
+      case Feature.FIELD_WITHOUT_INITIALIZER:
+        if (element.isInstanceMember) {
+          bool missing = false;
+          OUTER:
+          for (ConstructorElement constructor
+              in element.enclosingClass.constructors) {
+            if (constructor.isGenerativeConstructor &&
+                !constructor.isRedirectingGenerative) {
+              for (ParameterElement parameter in constructor.parameters) {
+                if (parameter is InitializingFormalElement &&
+                    parameter.fieldElement == element) {
+                  continue OUTER;
+                }
+              }
+              if (constructor.resolvedAst.kind == ResolvedAstKind.PARSED) {
+                var function = constructor.resolvedAst.node;
+                if (function.initializers != null) {
+                  TreeElements elements = constructor.resolvedAst.elements;
+                  for (var initializer in function.initializers) {
+                    if (elements[initializer] == element) {
+                      continue OUTER;
+                    }
+                  }
+                }
+              }
+              missing = true;
+            }
+          }
+          if (!missing) continue;
+        }
+        builder.registerConstantLiteral(new NullConstantExpression());
+        break;
       case Feature.STRING_INTERPOLATION:
       case Feature.STRING_JUXTAPOSITION:
         // These are both converted into a string concatenation in kernel so