   0  setfield_gc_i %r0, $True, FieldDescr<pypy.module._io.interp_bytesio.W_BytesIO.inst__RStringIO__closed>
   5  setfield_gc_r %r0, $<* struct stringbuilder>, FieldDescr<pypy.module._io.interp_bytesio.W_BytesIO.inst__RStringIO__strings>
  10  setfield_gc_r %r0, $<* struct list>, FieldDescr<pypy.module._io.interp_bytesio.W_BytesIO.inst__RStringIO__bigbuffer>
  15  setfield_gc_i %r0, $-1, FieldDescr<pypy.module._io.interp_bytesio.W_BytesIO.inst__RStringIO__pos>
  20  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
