From 32831c11e0692e8744e768c6b022e4756d3dcab6 Mon Sep 17 00:00:00 2001
From: "Sunrin SHIMURA (keen)" <3han5chou7@gmail.com>
Date: Wed, 4 Feb 2015 14:05:34 +0000
Subject: [PATCH] fix #257

---
 extlib/benz/pair.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/extlib/benz/pair.c b/extlib/benz/pair.c
index fc865921..1f1f3043 100644
--- a/extlib/benz/pair.c
+++ b/extlib/benz/pair.c
@@ -643,8 +643,12 @@ pic_pair_map(pic_state *pic)
   pic_value *args;
   pic_value arg, ret;
 
+  argc = 0;
   pic_get_args(pic, "l*", &proc, &argc, &args);
 
+  if (argc == 0)
+    pic_errorf(pic, "map: wrong number of arguments (1 for at least 2)");
+
   ret = pic_nil_value();
   do {
     arg = pic_nil_value();
@@ -655,6 +659,7 @@ pic_pair_map(pic_state *pic)
       pic_push(pic, pic_car(pic, args[i]), arg);
       args[i] = pic_cdr(pic, args[i]);
     }
+
     if (i != argc) {
       break;
     }