   0  inline_call_ir_r <JitCode 'interp_w__W_FFIObject'>, I[$False], R[%r0] -> %r0
   8  -live- %r0
   8  residual_call_r_r $<* fn W_FFIObject.descr_list_types>, R[%r0], <CallDescr(r) EF=7> -> %r0
  15  -live- %r0
  15  ref_return %r0
