Promote/LambdaCase.hs:0:0: Splicing declarations
    promote
      [d| foo1 :: a -> Maybe a -> a
          foo1 d x
            = (\case {
                 Just y -> y
                 Nothing -> d })
                x
          foo2 :: a -> Maybe a -> a
          foo2 d _
            = (\case {
                 Just y -> y
                 Nothing -> d })
                (Just d)
          foo3 :: a -> b -> a
          foo3 a b = (\case { (p, _) -> p }) (a, b) |]
  ======>
    Promote/LambdaCase.hs:(0,0)-(0,0)
    foo1 :: forall a. a -> Maybe a -> a
    foo1 d x
      = \case {
          Just y -> y
          Nothing -> d }
          x
    foo2 :: forall a. a -> Maybe a -> a
    foo2 d _
      = \case {
          Just y -> y
          Nothing -> d }
          (Just d)
    foo3 :: forall a b. a -> b -> a
    foo3 a b = \case { (p, _) -> p } (a, b)
    type family Case_0123456789 (t :: k)
                                (d :: d)
                                (x :: x)
                                (e :: e) :: r
    type instance Case_0123456789 (Just y) d x e = y
    type instance Case_0123456789 Nothing d x e = d
    type family Lambda_0123456789 (d :: d) (x :: x) (t :: k) :: r
    type instance Lambda_0123456789 d x e = Case_0123456789 e d x e
    data Lambda_0123456789Sym2 (l :: d) (l :: x) (l :: TyFun k r)
    type instance Apply (Lambda_0123456789Sym2 a a) a =
        Lambda_0123456789 a a a
    type family Case_0123456789 (t :: k) (d :: d) (e :: e) :: r
    type instance Case_0123456789 (Just y) d e = y
    type instance Case_0123456789 Nothing d e = d
    type family Lambda_0123456789 (d :: d) (t :: k) :: r
    type instance Lambda_0123456789 d e = Case_0123456789 e d e
    data Lambda_0123456789Sym1 (l :: d) (l :: TyFun k r)
    type instance Apply (Lambda_0123456789Sym1 a) a =
        Lambda_0123456789 a a
    type family Case_0123456789 (t :: k)
                                (a :: a)
                                (b :: b)
                                (e :: e) :: r
    type instance Case_0123456789 '(p, z) a b e = p
    type family Lambda_0123456789 (a :: a) (b :: b) (t :: k) :: r
    type instance Lambda_0123456789 a b e = Case_0123456789 e a b e
    data Lambda_0123456789Sym2 (l :: a) (l :: b) (l :: TyFun k r)
    type instance Apply (Lambda_0123456789Sym2 a a) a =
        Lambda_0123456789 a a a
    type family Foo1 (a :: a) (a :: Maybe a) :: a
    type instance Foo1 d x = Apply (Lambda_0123456789Sym2 d x) x
    data Foo1Sym1 (l :: a) (l :: TyFun (Maybe a) a)
    data Foo1Sym0 (k :: TyFun a (TyFun (Maybe a) a -> *))
    type instance Apply (Foo1Sym1 a) a = Foo1 a a
    type instance Apply Foo1Sym0 a = Foo1Sym1 a
    type family Foo2 (a :: a) (a :: Maybe a) :: a
    type instance Foo2 d z =
        Apply (Lambda_0123456789Sym1 d) (Apply JustSym0 d)
    data Foo2Sym1 (l :: a) (l :: TyFun (Maybe a) a)
    data Foo2Sym0 (k :: TyFun a (TyFun (Maybe a) a -> *))
    type instance Apply (Foo2Sym1 a) a = Foo2 a a
    type instance Apply Foo2Sym0 a = Foo2Sym1 a
    type family Foo3 (a :: a) (a :: b) :: a
    type instance Foo3 a b = Apply (Lambda_0123456789Sym2 a b) '(a, b)
    data Foo3Sym1 (l :: a) (l :: TyFun b a)
    data Foo3Sym0 (k :: TyFun a (TyFun b a -> *))
    type instance Apply (Foo3Sym1 a) a = Foo3 a a
    type instance Apply Foo3Sym0 a = Foo3Sym1 a