From 537b4a64227aebf357a5c3f570e01be5f2f824fd Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 13 Jun 2014 08:34:17 +0000
Subject: array.c: combination on a shared copy

* array.c (rb_ary_combination): iterate on a shared copy, and use
  array of indexes instead of array of chosen objects.
  [ruby-core:63149] [Bug #9939]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46418 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_array.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 676b20b1c4..a3d7163605 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -2291,6 +2291,15 @@ class TestArray < Test::Unit::TestCase
     assert_equal(:called, (0..100).to_a.combination(50) { break :called }, "[ruby-core:29240] ... must be yielded even if 100C50 > signed integer")
   end
 
+  def test_combination_clear
+    bug9939 = '[ruby-core:63149] [Bug #9939]'
+    assert_separately([], <<-'end;')
+      100_000.times {Array.new(1000)}
+      a = [*0..100]
+      a.combination(3) {|*,x| a.clear}
+    end;
+  end
+
   def test_product2
     a = (0..100).to_a
     assert_raise(RangeError) do
-- 
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