Singletons/T296.hs:(0,0)-(0,0): Splicing declarations
    singletons
      [d| f :: forall a. MyProxy a -> MyProxy a
          f MyProxy
            = let
                x = let
                      z :: MyProxy a
                      z = MyProxy
                    in z
              in x
          
          data MyProxy (a :: Type) = MyProxy |]
  ======>
    data MyProxy (a :: Type) = MyProxy
    f :: forall a. MyProxy a -> MyProxy a
    f MyProxy
      = let
          x = let
                z :: MyProxy a
                z = MyProxy
              in z
        in x
    type MyProxySym0 :: forall (a :: Type). MyProxy a
    type family MyProxySym0 :: MyProxy a where
      MyProxySym0 = MyProxy
    data Let0123456789876543210ZSym0 a0123456789876543210
      where
        Let0123456789876543210ZSym0KindInference :: SameKind (Apply Let0123456789876543210ZSym0 arg) (Let0123456789876543210ZSym1 arg) =>
                                                    Let0123456789876543210ZSym0 a0123456789876543210
    type instance Apply Let0123456789876543210ZSym0 a0123456789876543210 = Let0123456789876543210Z a0123456789876543210
    instance SuppressUnusedWarnings Let0123456789876543210ZSym0 where
      suppressUnusedWarnings
        = snd ((,) Let0123456789876543210ZSym0KindInference ())
    type family Let0123456789876543210ZSym1 a0123456789876543210 :: MyProxy a0123456789876543210 where
      Let0123456789876543210ZSym1 a0123456789876543210 = Let0123456789876543210Z a0123456789876543210
    type family Let0123456789876543210Z a0123456789876543210 :: MyProxy a0123456789876543210 where
      Let0123456789876543210Z a = MyProxySym0
    data Let0123456789876543210XSym0 a0123456789876543210
      where
        Let0123456789876543210XSym0KindInference :: SameKind (Apply Let0123456789876543210XSym0 arg) (Let0123456789876543210XSym1 arg) =>
                                                    Let0123456789876543210XSym0 a0123456789876543210
    type instance Apply Let0123456789876543210XSym0 a0123456789876543210 = Let0123456789876543210X a0123456789876543210
    instance SuppressUnusedWarnings Let0123456789876543210XSym0 where
      suppressUnusedWarnings
        = snd ((,) Let0123456789876543210XSym0KindInference ())
    type family Let0123456789876543210XSym1 a0123456789876543210 where
      Let0123456789876543210XSym1 a0123456789876543210 = Let0123456789876543210X a0123456789876543210
    type family Let0123456789876543210X a0123456789876543210 where
      Let0123456789876543210X a = Let0123456789876543210ZSym1 a
    type FSym0 :: forall a. (~>) (MyProxy a) (MyProxy a)
    data FSym0 :: (~>) (MyProxy a) (MyProxy a)
      where
        FSym0KindInference :: SameKind (Apply FSym0 arg) (FSym1 arg) =>
                              FSym0 a0123456789876543210
    type instance Apply FSym0 a0123456789876543210 = F a0123456789876543210
    instance SuppressUnusedWarnings FSym0 where
      suppressUnusedWarnings = snd ((,) FSym0KindInference ())
    type FSym1 :: forall a. MyProxy a -> MyProxy a
    type family FSym1 (a0123456789876543210 :: MyProxy a) :: MyProxy a where
      FSym1 a0123456789876543210 = F a0123456789876543210
    type F :: forall a. MyProxy a -> MyProxy a
    type family F (a :: MyProxy a) :: MyProxy a where
      F @a (MyProxy :: MyProxy a) = Let0123456789876543210XSym1 a
    sF ::
      forall a (t :: MyProxy a). Sing t
                                 -> Sing (Apply FSym0 t :: MyProxy a)
    sF SMyProxy
      = let
          sX :: Sing @_ (Let0123456789876543210XSym1 a)
          sX
            = let
                sZ :: (Sing (Let0123456789876543210ZSym1 a :: MyProxy a) :: Type)
                sZ = SMyProxy
              in sZ
        in sX
    instance SingI (FSym0 :: (~>) (MyProxy a) (MyProxy a)) where
      sing = singFun1 @FSym0 sF
    data SMyProxy :: forall (a :: Type). MyProxy a -> Type
      where
        SMyProxy :: forall (a :: Type). SMyProxy (MyProxy :: MyProxy a)
    type instance Sing @(MyProxy a) = SMyProxy
    instance SingKind a => SingKind (MyProxy a) where
      type Demote (MyProxy a) = MyProxy (Demote a)
      fromSing SMyProxy = MyProxy
      toSing MyProxy = SomeSing SMyProxy
    instance SingI MyProxy where
      sing = SMyProxy