anchor.diff:    _loadScriptCallback(tag, uri, libraryUri, data);
     assert(_numOutstandingLoadRequests > 0);
     _numOutstandingLoadRequests--;
  -  _logResolution("native Builtin_LoadScript($uri) completed, "
  -                 "${_numOutstandingLoadRequests} requests remaining");
  +  if (_logBuiltin) {
  +    _print("native Builtin_LoadScript($uri) completed, "
  +           "${_numOutstandingLoadRequests} requests remaining");
  +  }
     if (_numOutstandingLoadRequests == 0) {
       _signalDoneLoading();
       _cleanup();
  
positive.code:     default:
        // Only handling file, http, and package URIs
        // in standalone binary.
        _logResolution('# Unknown scheme (${uri.scheme}) in $uri.');
        throw 'Not a known scheme: $uri';
    }
  }
  
negative.code: // Returns either a file path or a URI starting with http:, as a String.
  String _filePathFromUri(String userUri) {
    var uri = Uri.parse(userUri);
    if (_logBuiltin) {
      _print('# Getting file path from: $uri');
    }
  
    var path;
    switch (uri.scheme) {
  