   0  residual_call_r_i $<* fn W_NDIter.iternext>, R[%r0], <CallDescr(r) EF=5> -> %i0
   7  -live- %i0
  10  goto_if_not %i0, L1
  14  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
  16  ---
  16  L1:
  16  ref_return $<* struct pypy.interpreter.baseobjspace.W_Root>
