anchor.diff:                  grammar = [{name = "e"
                               args = []
                               body = PSeq ([{omit = false
  -                                           rule = PToken ("R", (28, 29))
  +                                           rule = PToken ("R", (28, 29, ""))
                                              binding = None
                                              checker = None}],None)
                               _public = true
  
positive.code:                             PSeq(
                                  [{ 
                                      omit = false
                                      rule = PToken ("NUMBER", (4, 10))
                                      binding = None
                                      checker = None
                                  }; { 
                                      omit = false
                                      rule = PToken ("PLUS", (11, 15))
                                      binding = None
                                      checker = None
                                  }; {
                                      omit = false
                                      rule = PToken ("NUMBER", (16, 22))
                                      binding = None
                                      checker = None
                                  }],
  
negative.code:              grammar = [{name = "e"
                           args = []
                           body = PSeq ([{omit = false
                                          rule = PToken ("N", (17, 18, ""))
                                          binding = None
                                          checker = None}],None)
                           _public = true
  