Singletons/T163.hs:0:0:: Splicing declarations
    singletons [d| data a + b = L a | R b |]
  ======>
    data (+) a b = L a | R b
    type LSym1 (t0123456789876543210 :: a0123456789876543210) =
        L t0123456789876543210
    instance SuppressUnusedWarnings LSym0 where
      suppressUnusedWarnings = snd (((,) LSym0KindInference) ())
    data LSym0 :: forall a0123456789876543210 b0123456789876543210.
                  (~>) a0123456789876543210 ((+) a0123456789876543210 b0123456789876543210)
      where
        LSym0KindInference :: forall t0123456789876543210
                                     arg. SameKind (Apply LSym0 arg) (LSym1 arg) =>
                              LSym0 t0123456789876543210
    type instance Apply LSym0 t0123456789876543210 = L t0123456789876543210
    type RSym1 (t0123456789876543210 :: b0123456789876543210) =
        R t0123456789876543210
    instance SuppressUnusedWarnings RSym0 where
      suppressUnusedWarnings = snd (((,) RSym0KindInference) ())
    data RSym0 :: forall b0123456789876543210 a0123456789876543210.
                  (~>) b0123456789876543210 ((+) a0123456789876543210 b0123456789876543210)
      where
        RSym0KindInference :: forall t0123456789876543210
                                     arg. SameKind (Apply RSym0 arg) (RSym1 arg) =>
                              RSym0 t0123456789876543210
    type instance Apply RSym0 t0123456789876543210 = R t0123456789876543210
    data (%+) :: forall a b. (+) a b -> GHC.Types.Type
      where
        SL :: forall a (n :: a). (Sing (n :: a)) -> (%+) (L n)
        SR :: forall b (n :: b). (Sing (n :: b)) -> (%+) (R n)
    type instance Sing @((+) a b) = (%+)
    instance (SingKind a, SingKind b) => SingKind ((+) a b) where
      type Demote ((+) a b) = (+) (Demote a) (Demote b)
      fromSing (SL b) = L (fromSing b)
      fromSing (SR b) = R (fromSing b)
      toSing (L (b :: Demote a))
        = case toSing b :: SomeSing a of { SomeSing c -> SomeSing (SL c) }
      toSing (R (b :: Demote b))
        = case toSing b :: SomeSing b of { SomeSing c -> SomeSing (SR c) }
    instance SingI n => SingI (L (n :: a)) where
      sing = SL sing
    instance SingI (LSym0 :: (~>) a ((+) a b)) where
      sing = (singFun1 @LSym0) SL
    instance SingI n => SingI (R (n :: b)) where
      sing = SR sing
    instance SingI (RSym0 :: (~>) b ((+) a b)) where
      sing = (singFun1 @RSym0) SR