Parse new library syntax.

dart/pkg/dartdoc/lib/src/mirrors/dart2js_mirror.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('mirrors.dart2js');
 
 #import('dart:io');
 #import('dart:uri');
 
 #import('../../../../../lib/compiler/compiler.dart', prefix: 'diagnostics');
@@ skipping 474 matching lines @@
 
   String get canonicalName => simpleName;
 
   /**
    * Returns the library name (for libraries with a #library tag) or the script
    * file name (for scripts without a #library tag). The latter case is used to
    * provide a 'library name' for scripts, to use for instance in dartdoc.
    */
   String get simpleName {
     if (_library.libraryTag !== null) {
-      return _library.libraryTag.argument.dartString.slowToString();
+      // TODO(ahe): Remove StringNode check when old syntax is removed.
+      StringNode name = _library.libraryTag.name.asStringNode();
+      if (name !== null) {
+        return name.dartString.slowToString();
+      } else {
+        return _library.libraryTag.name.toString();
+      }
     } else {
       // Use the file name as script name.
       String path = _library.uri.path;
       return path.substring(path.lastIndexOf('/') + 1);
     }
   }
 
   String get qualifiedName => simpleName;
 
   void _ensureTypes() {
@@ skipping 879 matching lines @@
     if (node !== null) {
       var span = system.compiler.spanFromNode(node, script.uri);
       return new Dart2JsLocation(script, span);
     } else {
       var span = system.compiler.spanFromElement(_variable);
       return new Dart2JsLocation(script, span);
     }
   }
 }