   0  getfield_gc_r %r0, FieldDescr<rpython.rlib.streamio.CallbackReadFilter.inst_callback> -> %r0
   5  getfield_gc_r %r0, FieldDescr<pypy.module._file.interp_file.W_File.inst_stream> -> %r0
  10  -live- %r0
  10  goto_if_not_ptr_iszero %r0, L1
  14  L2:
  14  residual_call_r_r $<* fn BufferingInputStream.readline>, R[$<* struct rpython.rlib.streamio.Stream>], <CallDescr(r) EF=7> -> %r0
  21  -live- %r0
  21  ref_return %r0
  23  ---
  23  L1:
  23  -live- %r0
  23  guard_class %r0 -> %i0
  26  getfield_raw_i %i0, FieldDescr<rpython.rlib.streamio.Stream_vtable.cls_flush> -> %i0
  31  -live- %i0, %r0
  31  int_guard_value %i0
  33  residual_call_r_v %i0, <IndirectCallTargets>, R[%r0], <CallDescr(r) EF=7>
  39  -live-
  39  goto L2
