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diff --git a/testsuite/tests/rep-poly/T14561b.hs b/testsuite/tests/rep-poly/T14561b.hs
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+++ b/testsuite/tests/rep-poly/T14561b.hs
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+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE MagicHash #-}
+
+module T14561 where
+
+import Data.Coerce
+import GHC.Exts
+
+badId :: forall r (a :: TYPE r). a -> a
+badId = coerce
+-- Un-saturated application of a representation-polymorphic
+-- function that must be eta-expanded