From 76e10351faa20301f73a333b13f94a41059baf14 Mon Sep 17 00:00:00 2001
From: ksss <co000ri@gmail.com>
Date: Sun, 5 Mar 2017 14:15:18 +0900
Subject: String#index shouldn't return nil when "".index ""

---
 src/string.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/string.c b/src/string.c
index 9efc89b34..c36b7524a 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1608,7 +1608,7 @@ mrb_str_index(mrb_state *mrb, mrb_value str)
       return mrb_nil_value();
     }
   }
-  if (pos >= clen) return mrb_nil_value();
+  if (pos > clen) return mrb_nil_value();
   pos = chars2bytes(str, 0, pos);
 
   switch (mrb_type(sub)) {
-- 
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