   0  int_signext %i0, $4 -> %i0
   4  residual_call_ir_i $<* fn strerror>, I[%i0], R[], <CallDescr(i) EF=2> -> %i0
  12  -live- %i0
  15  goto_if_not_int_is_true %i0, L1
  19  residual_call_ir_r $<* fn charp2str>, I[%i0], R[], <CallDescr(i) EF=5> -> %r0
  27  -live- %r0
  30  ref_return %r0
  32  ---
  32  L1:
  32  raise $<* struct object>
