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-rw-r--r--Lib/test/string_tests.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index d792529..413f9dd 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -1142,6 +1142,9 @@ class MixinStrUnicodeUserStringTest:
self.checkraises(TypeError, '%10.*f', '__mod__', ('foo', 42.))
self.checkraises(ValueError, '%10', '__mod__', (42,))
+ class X(object): pass
+ self.checkraises(TypeError, 'abc', '__mod__', X())
+
def test_floatformatting(self):
# float formatting
for prec in range(100):