   0  getfield_gc_r %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_args_w> -> %r1
   5  getfield_gc_i %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_args_index> -> %i0
  10  arraylen_gc %r1, <rpython.jit.backend.llsupport.descr.ArrayDescr object at 0x0000000177231bb0> -> %i1
  15  -live- %i0, %i1, %r0, %r1
  15  goto_if_not_int_ge %i0, %i1, L1
  20  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x000000019f64f088> -> %r0
  24  setfield_gc_r %r0, $<* struct rpy_string>, FieldDescr<rpython.rlib.rstruct.error.StructError.inst_msg>
  29  assert_not_none %r0
  31  -live- %r0
  31  guard_class %r0 -> %i0
  34  -live- %r0
  34  raise %r0
  36  ---
  36  L1:
  36  getarrayitem_gc_r %r1, %i0, <rpython.jit.backend.llsupport.descr.ArrayDescr object at 0x0000000177231bb0> -> %r1
  42  getfield_gc_i %r0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_args_index> -> %i0
  47  int_add %i0, $1 -> %i0
  51  setfield_gc_i %r0, %i0, FieldDescr<pypy.module.struct.formatiterator.PackFormatIterator.inst_args_index>
  56  ref_return %r1
