dart2dart Collect type placeholder for default class.

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('mock_compiler.dart');
 #import("../../../lib/compiler/compiler.dart");
+#import("../../../lib/compiler/implementation/dart_backend/dart_backend.dart");
+#import("../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
   Node node = parseStatement(statement);
   Expect.equals(statement, node.unparse());
 }
 
 testUnparseMember(String member) {
   Node node = parseMember(member);
   Expect.equals(member, node.unparse());
@@ skipping 421 matching lines @@
     'set topgetset(arg){}'
     'main(){topgetset; topgetset=6; p_topgetset; p_topgetset=5;}';
   testDart2DartWithLibrary(mainSrc, librarySrc,
       (String result) { Expect.equals(expectedResult, result); });
 }
 
 testFieldTypeOutput() {
   testDart2Dart('main(){new A().field;}class B{}class A{B field;}');
 }
 
+testDefaultClassNamePlaceholder() {
+  var src = '''
+interface I default C{
+  I();
+}
+
+class C {
+  I() {}
+}
+
+main() {
+  new I();
+}
+''';
+  MockCompiler compiler = new MockCompiler();
+  compiler.parseScript(src);
+  ClassElement interfaceElement = compiler.mainApp.find(buildSourceString('I'));
+  interfaceElement.ensureResolved(compiler);
+  PlaceholderCollector collector = new PlaceholderCollector(compiler);
+  collector.collect(interfaceElement,
+      compiler.enqueuer.resolution.resolvedElements[interfaceElement]);
+  ClassNode interfaceNode = interfaceElement.parseNode(compiler);
+  Node defaultTypeNode = interfaceNode.defaultClause.typeName;
+  ClassElement classElement = compiler.mainApp.find(buildSourceString('C'));
+  // Check that 'C' in default clause of I gets into placeholders.
+  Expect.isTrue(collector.elementNodes[classElement].contains(defaultTypeNode));
+}
+
 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();
   testFieldTypeOutput();
+  testDefaultClassNamePlaceholder();
 }