From 95412aeb502298e58233117d6be7dc2e95912491 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 3 Aug 2015 13:24:04 +0900
Subject: better hash value from enumerables; fix #2906

---
 mrblib/enum.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mrblib/enum.rb b/mrblib/enum.rb
index 6bf219283..e979fe90e 100644
--- a/mrblib/enum.rb
+++ b/mrblib/enum.rb
@@ -402,8 +402,11 @@ module Enumerable
   # redefine #hash 15.3.1.3.15
   def hash
     h = 12347
+    i = 0
     self.each do |e|
-      h ^= e.hash
+      n = e.hash << (i % 16)
+      h ^= n
+      i += 1
     end
     h
   end
-- 
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