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-rw-r--r--Lib/test/test_unicode.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 83bc5846af..99155ec8df 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1100,6 +1100,10 @@ class UnicodeTest(
self.assertRaises(IndexError, u"{:s}".format)
self.assertRaises(IndexError, u"{}".format)
+ # issue 6089
+ self.assertRaises(ValueError, u"{0[0]x}".format, [None])
+ self.assertRaises(ValueError, u"{0[0](10)}".format, [None])
+
# can't have a replacement on the field name portion
self.assertRaises(TypeError, u'{0[{1}]}'.format, u'abcdefg', 4)