Highlight FieldFormalParameterElement as a field only in declaration.

pkg/analysis_server/test/analysis/notification_highlights_test2.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 test.analysis.notification.highlights2;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 893 matching lines @@
   p;
   p = 42;
 }
 ''');
     await prepareHighlights();
     assertHasRegion(HighlightRegionType.PARAMETER_DECLARATION, 'p) {');
     assertHasRegion(HighlightRegionType.PARAMETER_REFERENCE, 'p;');
     assertHasRegion(HighlightRegionType.PARAMETER_REFERENCE, 'p = 42');
   }
 
+  test_PARAMETER_named() async {
+    addTestFile('''
+class C {
+  final int aaa;
+  C({this.aaa, int bbb});
+}
+main() {
+  new C(aaa: 1, bbb: 2);
+}
+''');
+    await prepareHighlights();
+    assertHasRegion(HighlightRegionType.INSTANCE_FIELD_REFERENCE, 'aaa,');
+    assertHasRegion(HighlightRegionType.PARAMETER_DECLARATION, 'bbb}');
+    assertHasRegion(HighlightRegionType.PARAMETER_REFERENCE, 'aaa: 1');
+    assertHasRegion(HighlightRegionType.PARAMETER_REFERENCE, 'bbb: 2');
+  }
+
   test_SETTER_DECLARATION() async {
     addTestFile('''
 set aaa(x) {}
 class A {
   set bbb(x) {}
   static set ccc(x) {}
 }
 main(A a) {
   aaa = 1;
   a.bbb = 2;
@@ skipping 160 matching lines @@
   void test_toString() {
     expect(HighlightRegionType.CLASS.toString(), 'HighlightRegionType.CLASS');
   }
 
   void test_valueOf_unknown() {
     expect(() {
       new HighlightRegionType('no-such-type');
     }, throws);
   }
 }