### return value test
in return_op: 0
SV = PVIV(0xffd228) at 0xfebda0
  REFCNT = 1
  FLAGS = (TEMP,IOK,POK,pIOK,pPOK)
  IV = 0
  PV = 0x1013fd0 "0"\0
  CUR = 1
  LEN = 8
in return_op: 0
SV = PVIV(0xffd240) at 0xfebf80
  REFCNT = 1
  FLAGS = (TEMP,IOK,POK,pIOK,pPOK)
  IV = 0
  PV = 0x10102b0 "0"\0
  CUR = 1
  LEN = 8