From 25a5227ab188b940d8bbc291bf4c9d62e5d63163 Mon Sep 17 00:00:00 2001
From: mrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 9 Aug 2018 13:18:08 +0000
Subject: [PATCH] enumerator.c: undef new and allocate of ArithmeticSequence

Undefine new and allocate methods of Enumerator::ArithmeticSequence.

[ruby-core:82816] [Feature #13904]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64256 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 enumerator.c                          | 2 ++
 test/ruby/test_arithmetic_sequence.rb | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/enumerator.c b/enumerator.c
index 66c126d409..9e48fddae3 100644
--- a/enumerator.c
+++ b/enumerator.c
@@ -2844,6 +2844,8 @@ InitVM_Enumerator(void)
 
     /* ArithmeticSequence */
     rb_cArithSeq = rb_define_class_under(rb_cEnumerator, "ArithmeticSequence", rb_cEnumerator);
+    rb_undef_alloc_func(rb_cArithSeq);
+    rb_undef_method(CLASS_OF(rb_cArithSeq), "new");
     rb_define_method(rb_cArithSeq, "begin", arith_seq_begin, 0);
     rb_define_method(rb_cArithSeq, "end", arith_seq_end, 0);
     rb_define_method(rb_cArithSeq, "exclude_end?", arith_seq_exclude_end, 0);
diff --git a/test/ruby/test_arithmetic_sequence.rb b/test/ruby/test_arithmetic_sequence.rb
index fe1af362f4..fcabc8a8c7 100644
--- a/test/ruby/test_arithmetic_sequence.rb
+++ b/test/ruby/test_arithmetic_sequence.rb
@@ -2,6 +2,14 @@
 require 'test/unit'
 
 class TestArithmeticSequence < Test::Unit::TestCase
+  def test_new
+    assert_raise(NoMethodError) { Enumerator::ArithmeticSequence.new }
+  end
+
+  def test_allocate
+    assert_raise(TypeError) { Enumerator::ArithmeticSequence.allocate }
+  end
+
   def test_begin
     assert_equal(1, 1.step.begin)
     assert_equal(1, 1.step(10).begin)