From c870705df4b76913c4e335ca5e4a92e5f833f940 Mon Sep 17 00:00:00 2001
From: yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 20 Dec 2010 13:23:02 +0000
Subject: merges r29885 from trunk into ruby_1_9_2. -- * vm.c (rb_thread_mark):
 should mark self in conrol   frames.  [ruby-core:33289]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30265 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_optimization.rb | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_optimization.rb b/test/ruby/test_optimization.rb
index 8e8311e6ef..b581b7dfd3 100644
--- a/test/ruby/test_optimization.rb
+++ b/test/ruby/test_optimization.rb
@@ -137,4 +137,27 @@ class TestRubyOptimization < Test::Unit::TestCase
     assert_equal true, MyObj.new == nil
   end
 
+  def test_tailcall
+    bug4082 = '[ruby-core:33289]'
+
+    option = {
+      tailcall_optimization: true,
+      trace_instruction: false,
+    }
+    iseq = RubyVM::InstructionSequence.new(<<-EOF, bug4082, __FILE__, __LINE__+1, option).eval
+      class #{self.class}::Tailcall
+        def fact_helper(n, res)
+          if n == 1
+            res
+          else
+            fact_helper(n - 1, n * res)
+          end
+        end
+        def fact(n)
+          fact_helper(n, 1)
+        end
+      end
+    EOF
+    assert_equal(9131, Tailcall.new.fact(3000).to_s.size, bug4082)
+  end
 end
-- 
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