Check for duplicate library names

lib/src/codegen/html_codegen.dart

 // Copyright (c) 2015, 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 dev_compiler.src.codegen.html_codegen;
 
 import 'package:html/dom.dart';
 import 'package:html/parser.dart' show parseFragment;
 import 'package:logging/logging.dart' show Logger;
 import 'package:path/path.dart' as path;
 
 import 'package:dev_compiler/src/dependency_graph.dart';
 import 'package:dev_compiler/src/options.dart';
 import 'package:dev_compiler/src/utils.dart' show colorOf, resourceOutputPath;
 
-import 'js_codegen.dart' show jsLibraryName, jsOutputPath;
+import 'js_codegen.dart' show jsOutputPath, jsOutputBase;
 
 /// Emits an entry point HTML file corresponding to [inputFile] that can load
 /// the code generated by the dev compiler.
 ///
 /// This internally transforms the given HTML [document]. When compiling to
 /// JavaScript, we remove any Dart script tags, add new script tags to load our
 /// runtime and the compiled code, and to execute the main method of the
 /// application. When compiling to Dart, we ensure that the document contains a
 /// single Dart script tag, but otherwise emit the original document
 /// unmodified.
@@ skipping 48 matching lines @@
     } else if (ext == '.css') {
       var stylesheetLink = '<link rel="stylesheet" href="$resourcePath">\n';
       fragment.nodes.add(parseFragment(stylesheetLink));
     }
   }
 
   String mainLibraryName;
   for (var lib in libraries) {
     var info = lib.info;
     if (info == null) continue;
-    if (info.isEntry) mainLibraryName = jsLibraryName(info.library);
-    var jsPath = jsOutputPath(info, root.uri);
+    var jsPath = jsOutputPath(info.library, root.uri);
+    if (info.isEntry) mainLibraryName = jsOutputBase(info.library, root.uri);
     if (lib.cachingHash != null) {
       jsPath = _addHash(jsPath, lib.cachingHash);
     }
     fragment.nodes.add(_libraryInclude(jsPath));
   }
   fragment.nodes.add(_invokeMain(mainLibraryName));
   scripts[0].replaceWith(fragment);
   return '${document.outerHtml}\n';
 }
 
 /// A script tag that loads the .js code for a compiled library.
 Node _libraryInclude(String jsUrl) =>
     parseFragment('<script src="$jsUrl"></script>\n');
 
 /// A script tag that invokes the main function on the entry point library.
 Node _invokeMain(String mainLibraryName) {
   var code = mainLibraryName == null
       ? 'console.error("dev_compiler error: main was not generated");'
       // TODO(vsm): Can we simplify this?
       // See: https://github.com/dart-lang/dev_compiler/issues/164
-      : '_isolate_helper.startRootIsolate($mainLibraryName.main, []);';
+      : "dart.start('$mainLibraryName');";
   return parseFragment('<script>$code</script>\n');
 }
 
 /// Convert the outputPath to include the hash in it. This function is the
 /// reverse of what the server does to determine whether a request needs to have
 /// cache headers added to it.
 _addHash(String outPath, String hash) {
   // (the ____ prefix makes it look better in the web inspector)
   return '$outPath?____cached=$hash';
 }
 
 final _log = new Logger('dev_compiler.src.codegen.html_codegen');