anchor.diff:                  grammar = [{name = "s"
                               args = []
                               body = PSeq ([{omit = false
  -                                           rule = PToken ("A", (17, 18))
  +                                           rule = PToken ("A", (15, 16))
                                              binding = None
                                              checker = None}; {omit = false
  -                                                             rule = PToken ("B", (35, 36))
  +                                                             rule = PToken ("B", (31, 32))
                                                                binding = None
                                                                checker = None}],None)
                               _public = true
  
positive.code:                 grammar = [{name = "s"
                              args = []
                              body = PSeq ([{omit = false
                                             rule = PToken ("C", (46, 47))
                                             binding = None
                                             checker = None}],None)
                              _public = true
  
negative.code:                 grammar = [{name = "s"
                              args = []
                              body = PSeq ([{omit = false
                                             rule = PToken ("A", (15, 16))
                                             binding = None
                                             checker = None}],None)
                              _public = true
  