code: function sc_lastPair(l) {
      if (!sc_isPair(l)) sc_error("sc_lastPair: pair expected");
      var res = l;
      var cdr = l.cdr;
      while (sc_isPair(cdr)) {
  	res = cdr;
  	cdr = res.cdr;
      }
      return res;
  }
docs: * META ((export #t))