Handle assignability for Send and SendSet

tests/compiler/dart2js/parser_helper.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.
 
 library parser_helper;
 
 import "package:expect/expect.dart";
 import "dart:uri";
 
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
@@ skipping 60 matching lines @@
 Node parseMember(String text, {DiagnosticListener diagnosticHandler}) {
   return parseBodyCode(text, (parser, tokens) => parser.parseMember(tokens),
                        diagnosticHandler: diagnosticHandler);
 }
 
 class MockFile extends SourceFile {
   MockFile(text)
       : super('<string>', text);
 }
 
+var sourceCounter = 0;
+
 Link<Element> parseUnit(String text, Compiler compiler,
-                        LibraryElement library) {
+                        LibraryElement library,
+                        [void registerSource(Uri uri, String source)]) {
   Token tokens = scan(text);
-  Uri uri = new Uri.fromComponents(scheme: "source");
+  Uri uri =
+      new Uri.fromComponents(scheme: "source", path: '${++sourceCounter}');
+  if (registerSource != null) {
+    registerSource(uri, text);
+  }
   var script = new Script(uri, new MockFile(text));
   var unit = new CompilationUnitElementX(script, library);
   int id = 0;
   ElementListener listener = new ElementListener(compiler, unit, () => id++);
   PartialParser parser = new PartialParser(listener);
   compiler.withCurrentElement(unit, () => parser.parseUnit(tokens));
   return unit.localMembers;
 }
 
 NodeList fullParseUnit(String source, {DiagnosticListener diagnosticHandler}) {
   return parseBodyCode(source, (parser, tokens) => parser.parseUnit(tokens),
                        diagnosticHandler: diagnosticHandler);
 }
 
 // TODO(ahe): We define this method to avoid having to import
 // the scanner in the tests. We should move SourceString to another
 // location instead.
 SourceString buildSourceString(String name) {
   return new SourceString(name);
 }