2 files changed, 10 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index bbe7df13dc..30f9a6cc04 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jun 13 19:46:21 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
+
+	* lib/cmath.rb: add new methd Object#real?. fix #3137
+
 Mon Jun 13 18:52:00 2011  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.c (is_kind_of_BigDecimal): new function to
diff --git a/lib/cmath.rb b/lib/cmath.rb
index 4751f6c4a1..e21f9d8947 100644
--- a/lib/cmath.rb
+++ b/lib/cmath.rb
@@ -314,3 +314,9 @@ module CMath
   module_function :lgamma
 
 end
+
+class Object
+  def real?
+    raise TypeError, "Numeric Number required"
+  end
+end