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diff --git a/html-test/src/Bug923.hs b/html-test/src/Bug923.hs
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+{-# LANGUAGE KindSignatures, FlexibleInstances, GADTs, DataKinds #-}
+module Bug923 where
+
+-- | A promoted tuple type
+data T :: (* -> (*,*)) -> * where
+  T :: a -> T ('(,) a)
+
+-- | A promoted tuple type in an instance
+instance Eq a => Eq (T ('(,) a)) where
+  T x == T y = x == y
+