anchor.diff:  Callable or([Callable p, Callable q]) => $package$or(p, q);
   
   abstract class Ordinal {
  -    $dart$core.Object successor;
  -    $dart$core.Object predecessor;
  +    $dart$core.Object get successor;
  +    $dart$core.Object get predecessor;
   }
   Tuple $package$findPair([Callable selecting, Iterable firstIterable, Iterable secondIterable]) {
       Iterator firstIter = firstIterable.iterator();
  
positive.code:         }
          return $this.uri;
      }
      $dart$core.int size;
      $dart$core.String uri;
      $dart$core.String textContent([$dart$core.Object encoding = $package$dart$default]);
      $dart$core.String get string;
      static $dart$core.String $get$string([final Resource $this]) => ((("" + $package$className($this)) + "[") + $this.uri) + "]";
  }
  abstract class Scalable {
  
negative.code:             return false;
          }
      })();
      $dart$core.int get hashCode;
      static $dart$core.int $get$hash([final Identifiable $this]) => $package$identityHash($this);
  }
  $dart$core.double $package$infinity = 1.0 / 0.0;
  