dart2dart Fix setter ref with library prefix.

tests/compiler/dart2js/unparser_test.dart

 // Copyright (c) 2012, 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.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
@@ skipping 378 matching lines @@
 testClassExtendsWithArgs() {
   testDart2Dart('main(){new B<Object>();}'
     'class A<T extends Object>{}'
     'class B<T extends Object> extends A<T>{}');
 }
 
 testStaticInvocation() {
   testDart2Dart('main(){var x=Math.parseDouble("1");}');
 }
 
+testLibraryGetSet() {
+  var librarySrc = '''
+#library('mylib');
+
+get topgetset() => 5;
+set topgetset(arg) {}
+''';
+  var mainSrc = '''
+#import('mylib.dart', prefix: 'mylib');
+
+main() {
+  mylib.topgetset;
+  mylib.topgetset = 5;
+}
+''';
+  var expectedResult = 'set topgetset(arg){}get topgetset()=> 5;main(){topgetset; topgetset=5;}';
+  testDart2DartWithLibrary(mainSrc, librarySrc,
+      (String result) { Expect.equals(expectedResult, result); });
+}
+
 main() {
   testSignedConstants();
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
   testSimpleFileUnparse();
   testTopLevelField();
   testSimpleObjectInstantiation();
   testSimpleTopLevelClass();
   testClassWithSynthesizedConstructor();
   testClassWithMethod();
   testExtendsImplements();
   testVariableDefinitions();
   testGetSet();
   testFactoryConstructor();
   testAbstractClass();
   testConflictSendsRename();
   testNoConflictSendsRename();
   testConflictLibraryClassRename();
   testDefaultClassWithArgs();
   testClassExtendsWithArgs();
   testStaticInvocation();
+  testLibraryGetSet();
 }