type B1 :: * -> *
data B1 a = B1 a
data instance C.F (B1 a) = B2 a
type D :: * -> *
data family D a
type C.C1 :: * -> Constraint
class C.C1 a where
  type C.F :: * -> *
  data family C.F a
type C.C1 :: * -> Constraint
class C.C1 a where
  type C.F :: * -> *
  data family C.F a
  	-- Defined at T5417a.hs:7:5
data instance C.F (B1 a) = B2 a 	-- Defined at T5417.hs:9:10