   0  int_signext %i0, $4 -> %i0
   4  residual_call_ir_i $<* fn ccall_dup__INT>, I[%i0], R[], <CallDescr(i) EF=7> -> %i0
  12  -live- %i0
  12  inline_call_ir_i <JitCode 'handle_posix_error__dup'>, I[%i0], R[$<* struct rpy_string>] -> %i0
  20  -live- %i0
  20  int_return %i0
