   0  getfield_gc_i %r0, FieldDescr<rpython.rlib.rmmap.MMap.inst_closed> -> %i0
   5  -live- %i0
   8  goto_if_not %i0, L1
  12  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x0000aaaaf886d210> -> %r0
  16  setfield_gc_r %r0, $<* struct rpy_string>, FieldDescr<rpython.rlib.rmmap.RMMapError.inst_message>
  21  assert_not_none %r0
  23  -live- %r0
  26  raise %r0
  28  ---
  28  L1:
  28  void_return
