Index: Objects/abstract.c
===================================================================
--- Objects/abstract.c	(revision 62638)
+++ Objects/abstract.c	(working copy)
@@ -2619,7 +2619,7 @@
 			Py_DECREF(checker);
 			return ok;
 		}
-		res = PyObject_CallFunctionObjArgs(checker, inst, NULL);
+		res = PyObject_CallFunctionObjArgs(checker, inst, cls, NULL);
 		Py_LeaveRecursiveCall();
 		Py_DECREF(checker);
 		if (res != NULL) {
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file10174/issue2325.patch">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file10174/issue2325.patch" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>