Singletons/T470.hs:(0,0)-(0,0): Splicing declarations
    singletons
      [d| type T :: Type -> Type
          
          data T a
            where
              MkT1 :: a -> T a
              MkT2 :: !Void -> T a
          data S = MkS {-# UNPACK #-} !Bool |]
  ======>
    type T :: Type -> Type
    data T a
      where
        MkT1 :: a -> T a
        MkT2 :: !Void -> T a
    data S = MkS {-# UNPACK #-} !Bool
    type MkT1Sym0 :: (~>) a (T a)
    data MkT1Sym0 :: (~>) a (T a)
      where
        MkT1Sym0KindInference :: SameKind (Apply MkT1Sym0 arg) (MkT1Sym1 arg) =>
                                 MkT1Sym0 a0123456789876543210
    type instance Apply MkT1Sym0 a0123456789876543210 = MkT1 a0123456789876543210
    instance SuppressUnusedWarnings MkT1Sym0 where
      suppressUnusedWarnings = snd ((,) MkT1Sym0KindInference ())
    type MkT1Sym1 :: a -> T a
    type family MkT1Sym1 (a0123456789876543210 :: a) :: T a where
      MkT1Sym1 a0123456789876543210 = MkT1 a0123456789876543210
    type MkT2Sym0 :: (~>) Void (T a)
    data MkT2Sym0 :: (~>) Void (T a)
      where
        MkT2Sym0KindInference :: SameKind (Apply MkT2Sym0 arg) (MkT2Sym1 arg) =>
                                 MkT2Sym0 a0123456789876543210
    type instance Apply MkT2Sym0 a0123456789876543210 = MkT2 a0123456789876543210
    instance SuppressUnusedWarnings MkT2Sym0 where
      suppressUnusedWarnings = snd ((,) MkT2Sym0KindInference ())
    type MkT2Sym1 :: Void -> T a
    type family MkT2Sym1 (a0123456789876543210 :: Void) :: T a where
      MkT2Sym1 a0123456789876543210 = MkT2 a0123456789876543210
    type MkSSym0 :: (~>) Bool S
    data MkSSym0 :: (~>) Bool S
      where
        MkSSym0KindInference :: SameKind (Apply MkSSym0 arg) (MkSSym1 arg) =>
                                MkSSym0 a0123456789876543210
    type instance Apply MkSSym0 a0123456789876543210 = MkS a0123456789876543210
    instance SuppressUnusedWarnings MkSSym0 where
      suppressUnusedWarnings = snd ((,) MkSSym0KindInference ())
    type MkSSym1 :: Bool -> S
    type family MkSSym1 (a0123456789876543210 :: Bool) :: S where
      MkSSym1 a0123456789876543210 = MkS a0123456789876543210
    type ST :: forall (a :: Type). T a -> Type
    data ST :: forall (a :: Type). T a -> Type
      where
        SMkT1 :: forall a (n :: a). (Sing n) -> ST (MkT1 n :: T a)
        SMkT2 :: forall a (n :: Void). !(Sing n) -> ST (MkT2 n :: T a)
    type instance Sing @(T a) = ST
    instance SingKind a => SingKind (T a) where
      type Demote (T a) = T (Demote a)
      fromSing (SMkT1 b) = MkT1 (fromSing b)
      fromSing (SMkT2 b) = MkT2 (fromSing b)
      toSing (MkT1 (b :: Demote a))
        = case toSing b :: SomeSing a of SomeSing c -> SomeSing (SMkT1 c)
      toSing (MkT2 (b :: Demote Void))
        = case toSing b :: SomeSing Void of
            SomeSing c -> SomeSing (SMkT2 c)
    data SS :: S -> Type
      where SMkS :: forall (n :: Bool). !(Sing n) -> SS (MkS n :: S)
    type instance Sing @S = SS
    instance SingKind S where
      type Demote S = S
      fromSing (SMkS b) = MkS (fromSing b)
      toSing (MkS (b :: Demote Bool))
        = case toSing b :: SomeSing Bool of SomeSing c -> SomeSing (SMkS c)
    instance SingI n => SingI (MkT1 (n :: a)) where
      sing = SMkT1 sing
    instance SingI1 MkT1 where
      liftSing = SMkT1
    instance SingI (MkT1Sym0 :: (~>) a (T a)) where
      sing = singFun1 @MkT1Sym0 SMkT1
    instance SingI n => SingI (MkT2 (n :: Void)) where
      sing = SMkT2 sing
    instance SingI1 MkT2 where
      liftSing = SMkT2
    instance SingI (MkT2Sym0 :: (~>) Void (T a)) where
      sing = singFun1 @MkT2Sym0 SMkT2
    instance SingI n => SingI (MkS (n :: Bool)) where
      sing = SMkS sing
    instance SingI1 MkS where
      liftSing = SMkS
    instance SingI (MkSSym0 :: (~>) Bool S) where
      sing = singFun1 @MkSSym0 SMkS

Singletons/T470.hs:0:0: warning: [GHC-39584]
    {-# UNPACK #-} pragmas are ignored by `singletons-th`.
  |
6 | $(singletons [d|
  |  ^^^^^^^^^^^^^^^...