From afe24d819c535f850bb12f65577fd911fd20bafc Mon Sep 17 00:00:00 2001
From: gogotanaka <mail@tanakakazuki.com>
Date: Sun, 22 Feb 2015 09:56:18 +0900
Subject: [PATCH 1/1] add_test_for_math_c_about_overriding_Integer_to_f.patch
To: https://bugs.ruby-lang.org/

---
 test/ruby/test_math.rb | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb
index c4d0ff9..4d975b6 100644
--- a/test/ruby/test_math.rb
+++ b/test/ruby/test_math.rb
@@ -289,4 +289,33 @@ class TestMath < Test::Unit::TestCase
     check(3, Math.cbrt(27))
     check(-0.1, Math.cbrt(-0.001))
   end
+
+  def test_override_fixnum_to_f
+    Fixnum.class_eval do
+      alias _to_f to_f
+      def to_f
+        (self + 1)._to_f
+      end
+    end
+
+    check(Math.cos((0 + 1)._to_f), Math.cos(0))
+    check(Math.exp((0 + 1)._to_f), Math.exp(0))
+    check(Math.log((0 + 1)._to_f), Math.log(0))
+
+    Fixnum.class_eval { alias to_f _to_f }
+  end
+
+  def test_override_bignum_to_f
+    Bignum.class_eval do
+      alias _to_f to_f
+      def to_f
+        (self << 1)._to_f
+      end
+    end
+
+    check(Math.cos((1 << 62 << 1)._to_f),  Math.cos(1 << 62))
+    check(Math.log((1 << 62 << 1)._to_f),  Math.log(1 << 62))
+
+    Bignum.class_eval { alias to_f _to_f }
+  end
 end
-- 
gogotanaka