Create synthetic FieldElement(s) (don't use non-synthetic ones) for non-synthetic class getters/set…

pkg/analyzer/test/src/context/context_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.src.context.context_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 3909 matching lines @@
         a,
         r'''
 const A = 2;
 ''');
     _assertInvalid(a, LIBRARY_ERRORS_READY);
     _assertInvalid(b, LIBRARY_ERRORS_READY);
     _assertInvalid(c, LIBRARY_ERRORS_READY);
     _assertInvalid(d, LIBRARY_ERRORS_READY);
   }
 
+  void test_sequence_duplicateField_syntheticAndNot_renameNotSynthetic() {
+    context.analysisOptions =
+        new AnalysisOptionsImpl.from(context.analysisOptions)
+          ..strongMode = true;
+    Source a = addSource(
+        '/a.dart',
+        r'''
+class A {
+  int foo;
+  int get foo => 1;
+}
+class B extends A {
+  int get foo => 2;
+}
+''');
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(a).errors, hasLength(2));
+    // Update a.dart: rename "int foo" to "int bar".
+    // The strong mode "getter cannot override field" error is gone.
+    context.setContents(
+        a,
+        r'''
+class A {
+  int bar;
+  int get foo => 1;
+}
+class B extends A {
+  int get foo => 2;
+}
+''');
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(a).errors, isEmpty);
+  }
+
   void test_sequence_inBodyChange_addRef_deltaChange() {
     Source a = addSource(
         '/a.dart',
         r'''
 class A {
 }
 ''');
     Source b = addSource(
         '/b.dart',
         r'''
@@ skipping 1043 matching lines @@
    * Initialize the visitor.
    */
   _ElementGatherer();
 
   @override
   void visitElement(Element element) {
     elements[element] = element;
     super.visitElement(element);
   }
 }