   0  getfield_gc_i %r0, FieldDescr<rpython.rlib.rmmap.MMap.inst_closed> -> %i0
   5  -live- %i0
   5  goto_if_not %i0, L1
   9  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x00000001b98aeb10> -> %r0
  13  setfield_gc_r %r0, $<* struct rpy_string>, FieldDescr<rpython.rlib.rmmap.RMMapError.inst_message>
  18  assert_not_none %r0
  20  -live- %r0
  20  guard_class %r0 -> %i0
  23  -live- %r0
  23  raise %r0
  25  ---
  25  L1:
  25  void_return
