     switch i {
       case 0: return ("location",reflect(_r.location))
       case 1: return ("length",reflect(_r.length))
-      default: _fatalError("don't ask")
+      default: _fatalError("Mirror access out of bounds")
     }
   }
   

  
  var count: Int { get { return 0 } }
  
  subscript(_: Int) -> (String,Mirror) { get { _fatalError("don't ask") } }
  
  var summary: String { get { return _u.absoluteString } }
  

  var count: Int { get { return 0 } }
  
  subscript(i: Int) -> (String,Mirror) {
    _fatalError("Mirror access out of bounds")
  }
  
  var summary: String {
