   0  -live- %r0
   0  guard_class %r0 -> %i0
   3  getfield_raw_i %i0, FieldDescr<pypy.module._io.interp_iobase.W_IOBase_vtable.cls__unsupportedoperation> -> %i0
   8  -live- %i0, %r0
   8  switch %i0, <SwitchDictDescr 0:L1, 1:L2>
  12  unreachable
  13  ---
  13  L1:
  13  -live-
  13  inline_call_r_r <JitCode 'unsupported'>, R[$<* struct rpy_string>] -> %r0
  19  -live- %r0
  19  assert_not_none %r0
  21  -live- %r0
  21  guard_class %r0 -> %i0
  24  -live- %r0
  24  raise %r0
  26  ---
  26  L2:
  26  -live- %r0
  26  inline_call_r_v <JitCode 'W_BufferedIOBase._unsupportedoperation'>, R[%r0, $<* struct rpy_string>]
  32  -live-
  32  raise $<* struct object>
