anchor.diff:  final String _packageRoot =
       '${path.dirname(Uri.parse(window.location.href).path)}/packages/';
   
  -/** Regex that matches urls used to represent inlined scripts. */
  -final RegExp _inlineScriptRegExp = new RegExp('\(.*\.html.*\):\([0-9]\+\)');
  -
  -/**
  - * Map URLs fabricated by polymer to URLs fabricated by Dartium to represent
  - * inlined scripts. Polymer uses baseUri:script#, Dartium uses baseUri:line#
  - */
  -// TODO(sigmund): figure out if we can generate the same URL and expose it.
  -final Map<Uri, List<Uri>> _inlinedScriptMapping = () {
  -  var map = {};
  -  for (var uri in _libs.keys) {
  -    var uriString = uri.toString();
  -    var match = _inlineScriptRegExp.firstMatch(uriString);
  -    if (match == null) continue;
  -    var baseUri = Uri.parse(match.group(1));
  -    if (map[baseUri] == null) map[baseUri] = [];
  -    map[baseUri].add(uri);
  -  }
  -  return map;
  -}();
  -
  -/** Returns a new Uri that replaces [path] in [uri]. */
  -Uri _replacePath(Uri uri, String path) {
  -  return new Uri(scheme: uri.scheme, host: uri.host, port: uri.port,
  -      path: path, query: uri.query, fragment: uri.fragment);
  -}
  -
  -/** Returns the Uri in [href] without query parameters or fragments. */
  -String _baseUri(String href) {
  -  var uri = Uri.parse(window.location.href);
  -  var trimUri = new Uri(scheme: uri.scheme, host: uri.host,
  -      port: uri.port, path: uri.path);
  -  return trimUri.toString();
  -}
  -
   /**
    * Reads the library at [uriString] (which can be an absolute URI or a relative
    * URI from the root library), and:
  
positive.code:  */
  void _loadLibrary(String uriString) {
    var uri = _rootUri.resolve(uriString);
    var lib;
    var match = _inlineScriptRegExp.firstMatch(uriString);
    if (match != null) {
      var baseUri = Uri.parse(match.group(1));
      var list = _inlinedScriptMapping[baseUri];
      var pos = int.parse(match.group(2), onError: (_) => -1);
      if (list != null && pos >= 0 && pos < list.length && list[pos] != null) {
        lib = _libs[list[pos]];
      }
    } else if (uri.path.startsWith(_packageRoot)) {
      var packageUri =
          Uri.parse('package:${uri.path.substring(_packageRoot.length)}');
      lib = _libs[packageUri];
      if (lib == null) {
        lib = _libs[uri];
      }
    } else {
      lib = _libs[uri];
    }
    if (lib == null) {
      print('warning: $uri library not found');
      return;
  
negative.code:   if (seen.contains(doc)) return scripts;
    seen.add(doc);
  
    bool scriptSeen = false;
    for (var node in doc.queryAll('script,link[rel="import"]')) {
      if (node is LinkElement) {
        _discoverScripts(node.import, node.href, seen, scripts);
      } else if (node is ScriptElement && node.type == 'application/dart') {
        if (!scriptSeen) {
          var url = node.src;
          scripts.add(url == '' ? baseUri : url);
          scriptSeen = true;
        } else {
          print('warning: more than one Dart script tag in $baseUri. Dartium '
              'currently only allows a single Dart script tag per document.');
        }
      }
    }
  