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diff --git a/testsuite/tests/typecheck/should_compile/T21010.hs b/testsuite/tests/typecheck/should_compile/T21010.hs
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+{-# LANGUAGE Haskell2010 #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module T21010 ( CBind(..) ) where
+import T21010A ( WrapMono, Constrained(Dom), withMonoCoercible )
+
+class CBind m where
+  (>>-) :: (Dom m a, Dom m b) => m a -> (a -> m b) -> m b
+
+instance CBind (WrapMono ()) where
+  (>>-) = withMonoCoercible undefined