* class.c (rb_class_init_copy): raise a TypeError if the argument is

BasicObject.  [ruby-core:27060]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Feb  7 00:23:21 2010  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* class.c (rb_class_init_copy): raise a TypeError if the argument is 
+	  BasicObject.  [ruby-core:27060]
+
 Sat Feb  6 23:37:11 2010  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* lib/net/ftp.rb (initialize): set @sock to a NullSocket instance to

class.c

@@ -180,6 +180,9 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
 VALUE
 rb_class_init_copy(VALUE clone, VALUE orig)
 {
+    if (orig == rb_cBasicObject) {
+	rb_raise(rb_eTypeError, "can't copy the root class");
+    }
     if (RCLASS_SUPER(clone) != 0 || clone == rb_cBasicObject) {
 	rb_raise(rb_eTypeError, "already initialized class");
     }

test/ruby/test_class.rb

@@ -181,6 +181,8 @@ class TestClass < Test::Unit::TestCase
     o = Object.new
     c = class << o; self; end
     assert_raise(TypeError) { c.dup }
+
+    assert_raise(TypeError) { BasicObject.dup }
   end
 
   def test_singleton_class