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+T15079_fail_b.hs:21:23: error: [GHC-11809]
+ • Couldn't match type ‘c0’ with ‘Coerce’
+ Expected: c0 a -> Coerce b
+ Actual: c0 a -> c0 b
+ Visibility of forall-bound variables in kinds differs
+ c0 :: forall i. i -> *
+ Coerce :: forall {k}. k -> *
+ • In the first argument of ‘(.)’, namely ‘hsubst f’
+ In the second argument of ‘(.)’, namely ‘hsubst f . Coerce’
+ In the expression: uncoerce . hsubst f . Coerce