From 1685eff2a5e672173d67916a1c96648df92b7271 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 16 Nov 2016 10:16:14 +0900
Subject: Fixed off-by-one error in String#[]= with Ranges

---
 mrblib/string.rb | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'mrblib/string.rb')

diff --git a/mrblib/string.rb b/mrblib/string.rb
index f22071b36..aa2ca9973 100644
--- a/mrblib/string.rb
+++ b/mrblib/string.rb
@@ -173,11 +173,8 @@ class String
         head = pos.begin
         tail = pos.end
         tail += self.length if tail < 0
-        if pos.exclude_end?
-          tail -= 1
-        end
-        if tail < 0 || tail > self.length
-          raise IndexError, "index #{args[0]} out of string"
+        unless pos.exclude_end?
+          tail += 1
         end
         return self[head, tail-head]=value
       else
-- 
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