41           0 LOAD_FAST                0 (x)
              2 JUMP_IF_FALSE_OR_POP    10
              4 LOAD_FAST                1 (y)
              6 LOAD_CONST               1 (1)
              8 BINARY_ADD
        >>   10 RETURN_VALUE

 39           0 RESUME                   0
 41           2 LOAD_FAST                0 (x)
              4 COPY                     1
              6 POP_JUMP_IF_FALSE        5 (to 18)
              8 POP_TOP
             10 LOAD_FAST                1 (y)
             12 LOAD_CONST               1 (1)
             14 BINARY_OP                0 (+)
        >>   18 RETURN_VALUE