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diff --git a/testsuite/tests/dependent/should_compile/T12174.hs b/testsuite/tests/dependent/should_compile/T12174.hs
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+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE ExistentialQuantification #-}
+{-# LANGUAGE KindSignatures #-}
+module T12174 where
+
+data V a
+data T = forall (a :: S). MkT (V a)
+data S = forall (a :: T). MkS (V a)