Fix for Issue 2878

frog/tests/frog_native/native_field_rename_2_frog_test.dart

+// Copyright (c) 2011, 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.
+
+// A native method prevents other members from having that name, including
+// fields.  However, native fields keep their name.  The implication: a getter
+// for the field must be based on the field's name, not the field's jsname.
+
+interface I {
+  int key;
+}
+
+class A implements I native "*A" {
+  int key;                    //  jsname is 'key'
+  int getKey() => key;
+}
+
+class B implements I {
+  int key;                    //  jsname is not 'key'
+  B([this.key = 222]);
+  int getKey() => key;
+}
+
+class X native "*X" {
+  int native_key_method() native 'key';
+  // This should cause B.key to be renamed, but not A.key.
+  int key() native 'key';
+}
+
+A makeA() native;
+X makeX() native;
+
+
+void setup() native """
+// This code is all inside 'setup' and so not accesible from the global scope.
+function A(){ this.key = 111; }
+A.prototype.getKey = function(){return this.key;};
+
+function X(){}
+X.prototype.key = function(){return 666;};
+
+makeA = function(){return new A};
+makeX = function(){return new X};
+""";
+
+testDynamic() {
+  var things = [makeA(), new B(), makeX()];
+  var a = things[0];
+  var b = things[1];
+  var x = things[2];
+
+  Expect.equals(111, a.key);
+  Expect.equals(222, b.key);
+  Expect.equals(111, a.getKey());
+  Expect.equals(222, b.getKey());
+
+  Expect.equals(666, x.native_key_method());
+  Expect.equals(666, x.key());
+  var fn = x.key;
+  Expect.equals(666, fn());
+}
+
+testPartial() {
+  var things = [makeA(), new B(), makeX()];
+  I a = things[0];
+  I b = things[1];
+
+  // All subtypes of I have a field 'key'. The compiler might be tempted to
+  // generate a direct property access, but that will fail since one of the
+  // fields is renamed.  A getter call is required here.
+  Expect.equals(111, a.key);
+  Expect.equals(222, b.key);
+}
+
+testTyped() {
+  A a = makeA();
+  B b = new B();
+  X x = makeX();
+
+  Expect.equals(666, x.native_key_method());
+  Expect.equals(111, a.key);
+  Expect.equals(222, b.key);
+  Expect.equals(111, a.getKey());
+  Expect.equals(222, b.getKey());
+}
+
+main() {
+  setup();
+
+  testTyped();
+  testPartial();
+  testDynamic();
+}