Report HintCode.UNUSED_FIELD for fields which are referenced in constructor field initializers.

pkg/analyzer/test/dart/ast/ast_test.dart

 // Copyright (c) 2014, 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 analyzer.test.dart.ast.ast_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/generated/testing/ast_factory.dart';
@@ skipping 574 matching lines @@
           }
         } else {
           if (!identifier.inGetterContext()) {
             fail("Expected ${_topMostNode(identifier).toSource()} to be true");
           }
         }
       }
     }
   }
 
+  void test_inGetterContext_constructorFieldInitializer() {
+    ConstructorFieldInitializer initializer = AstFactory
+        .constructorFieldInitializer(false, 'f', AstFactory.integer(0));
+    SimpleIdentifier identifier = initializer.fieldName;
+    expect(identifier.inGetterContext(), isFalse);
+  }
+
   void test_inGetterContext_forEachLoop() {
     SimpleIdentifier identifier = AstFactory.identifier3("a");
     Expression iterator = AstFactory.listLiteral();
     Statement body = AstFactory.block();
     AstFactory.forEachStatement2(identifier, iterator, body);
     expect(identifier.inGetterContext(), isFalse);
   }
 
   void test_inReferenceContext() {
     SimpleIdentifier identifier = AstFactory.identifier3("id");
@@ skipping 615 matching lines @@
   final int ordinal;
 
   const _WrapperKind(this.name, this.ordinal);
 
   int get hashCode => ordinal;
 
   int compareTo(_WrapperKind other) => ordinal - other.ordinal;
 
   String toString() => name;
 }