From b59a158a1870000ef1db5acd52afa1b40e2c4fe6 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 15 Apr 2016 16:26:38 +0000
Subject: * array.c (rb_ary_sum): Don't yield same element twice.   Found by
 nagachika.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54609 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_array.rb | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'test/ruby/test_array.rb')

diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index fb6b2a42ad..4ae5f9f820 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1,6 +1,7 @@
 # coding: US-ASCII
 # frozen_string_literal: false
 require 'test/unit'
+require "delegate"
 require "rbconfig/sizeof"
 
 class TestArray < Test::Unit::TestCase
@@ -2769,6 +2770,12 @@ class TestArray < Test::Unit::TestCase
     assert_int_equal(13, [1, 2].sum(10))
     assert_int_equal(16, [1, 2].sum(10) {|v| v * 2 })
 
+    yielded = []
+    three = SimpleDelegator.new(3)
+    ary = [1, 2.0, three]
+    assert_float_equal(12.0, ary.sum {|x| yielded << x; x * 2 })
+    assert_equal(ary, yielded)
+
     assert_raise(TypeError) { [Object.new].sum }
 
     large_number = 100000000
-- 
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