   0  -live- %r1
   0  goto_if_not_ptr_nonzero %r1, L1
   4  ref_copy %r1 -> %r0
   7  -live- %r0, %r1
   7  guard_class %r1 -> %i0
  10  -live- %i0, %r0
  10  goto_if_not_int_eq %i0, $<* struct object_vtable>, L2
  15  residual_call_r_r $<* fn W_Dtype.descr_get_fields>, R[%r0], <CallDescr(r) EF=7> -> %r0
  22  -live- %r0
  22  ref_return %r0
  24  ---
  24  L2:
  24  raise $<* struct object>
  26  ---
  26  L1:
  26  raise $<* struct object>
