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diff --git a/testsuite/tests/indexed-types/should_fail/SimpleFail3a.hs b/testsuite/tests/indexed-types/should_fail/SimpleFail3a.hs
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+++ b/testsuite/tests/indexed-types/should_fail/SimpleFail3a.hs
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+{-# LANGUAGE TypeFamilies #-}
+
+module ShouldFail where
+
+class C1 a where
+ data S1 a :: *
+
+-- must fail: wrong category of type instance
+instance C1 Int where
+ type S1 Int = Bool