file_input
  stmt
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                      expr
                        xor_expr
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                                term
                                  factor
                                    power
                                      atom
                                        T_NAME: 'y'
          T_EQUAL: '='
          testlist
            test
              or_test
                and_test
                  not_test
                    comparison
                      expr
                        xor_expr
                          and_expr
                            shift_expr
                              arith_expr
                                term
                                  factor
                                    power
                                      atom
                                        T_NUMBER: '1'
      T_NEWLINE: '\n'
  T_ENDMARKER: ''