Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(revision 46758)
+++ Objects/unicodeobject.c	(working copy)
@@ -4491,11 +4491,11 @@
 /* Make sure we have enough space for the separator and the item. */
 	itemlen = PyUnicode_GET_SIZE(item);
 	new_res_used = res_used + itemlen;
-	if (new_res_used <= 0) + if (new_res_used < 0) goto Overflow; if (i < seqlen - 1) { new_res_used += seplen; - if (new_res_used <= 0) + if (new_res_used < 0) goto Overflow; } if (new_res_used> res_alloc) {
Index: Lib/test/string_tests.py
===================================================================
--- Lib/test/string_tests.py	(revision 46758)
+++ Lib/test/string_tests.py	(working copy)
@@ -908,6 +908,8 @@
 # test.test_string.StringTest.test_join)
 self.checkequal('a b c d', ' ', 'join', ['a', 'b', 'c', 'd'])
 self.checkequal('abcd', '', 'join', ('a', 'b', 'c', 'd'))
+ self.checkequal('bd', '', 'join', ('', 'b', '', 'd'))
+ self.checkequal('ac', '', 'join', ('a', '', 'c', ''))
 self.checkequal('w x y z', ' ', 'join', Sequence())
 self.checkequal('abc', 'a', 'join', ('abc',))
 self.checkequal('z', 'a', 'join', UserList(['z']))
 	 	 
</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/file2025/patch-unicodejoin.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file2025/patch-unicodejoin.diff" 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>