Check for cyclic type variable bounds.

tests/compiler/dart2js/compiler_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.
 // Test constant folding.
 
 library compiler_helper;
 
 import "package:expect/expect.dart";
 import 'dart:uri';
 export 'dart:uri' show Uri;
@@ skipping 60 matching lines @@
   leg.CodegenWorkItem work =
       new leg.CodegenWorkItem(element, resolutionWork.resolutionTree, context);
   compiler.phase = Compiler.PHASE_COMPILING;
   work.run(compiler, compiler.enqueuer.codegen);
   js.JavaScriptBackend backend = compiler.backend;
   return backend.assembleCode(element);
 }
 
 MockCompiler compilerFor(String code, Uri uri,
                          {bool analyzeAll: false,
+                          bool analyzeOnly: false,
                           String coreSource: DEFAULT_CORELIB}) {
   MockCompiler compiler = new MockCompiler(
-      analyzeAll: analyzeAll, coreSource: coreSource);
+      analyzeAll: analyzeAll,
+      analyzeOnly: analyzeOnly,
+      coreSource: coreSource);
   compiler.sourceFiles[uri.toString()] = new SourceFile(uri.toString(), code);
   return compiler;
 }
 
 String compileAll(String code, {String coreSource: DEFAULT_CORELIB}) {
   Uri uri = new Uri.fromComponents(scheme: 'source');
   MockCompiler compiler = compilerFor(code, uri, coreSource: coreSource);
   compiler.runCompiler(uri);
   Expect.isFalse(compiler.compilationFailed,
                  'Unexpected compilation error');
@@ skipping 109 matching lines @@
   final xRe = new RegExp('\\bx\\b');
   regexp = regexp.replaceAll(xRe, '(?:$anyIdentifier)');
   final spaceRe = new RegExp('\\s+');
   regexp = regexp.replaceAll(spaceRe, '(?:\\s*)');
   if (shouldMatch) {
     Expect.isTrue(new RegExp(regexp).hasMatch(generated));
   } else {
     Expect.isFalse(new RegExp(regexp).hasMatch(generated));
   }
 }