   0  -live- %r0
   3  guard_class %r0 -> %i0
   6  getfield_raw_i %i0, FieldDescr<pypy.module._io.interp_iobase.W_IOBase_vtable.cls__check_closed> -> %i0
  11  -live- %i0, %r0
  14  int_guard_value %i0
  16  residual_call_r_v %i0, <IndirectCallTargets>, R[%r0, $<* struct rpy_string>], <CallDescr(rr) EF=7>
  23  -live- %r0
  26  ref_return %r0
