∀ {m : Type u_1 → Type u_2} {n : Type u_1 → Type u_3} {α : Type u_1} [inst : Monad m] [inst_1 : MonadAttach m]
  [LawfulMonad m] [LawfulMonadAttach m] [inst_4 : Monad n] [inst_5 : MonadAttach n] [LawfulMonad n]
  [LawfulMonadAttach n] [inst_8 : MonadLiftT m n] [LawfulMonadLiftT m n] {x : m α} {a : α},
  MonadAttach.CanReturn (liftM x) a → MonadAttach.CanReturn x a