anchor.diff:      static Empty $get$reversed([final Empty $this]) => $this;
       Empty sequence();
       static Empty $sequence([final Empty $this]) => $this;
  -    $dart$core.String get string;
  +    $dart$core.String toString();
       static $dart$core.String $get$string([final Empty $this]) => "[]";
       $dart$core.Object get lastIndex;
       static $dart$core.Object $get$lastIndex([final Empty $this]) => null;
  
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;
  