Singletons/FunDeps.hs:(0,0)-(0,0): Splicing declarations
    singletons
      [d| t1 = meth True
          
          class FD a b | a -> b where
            meth :: a -> a
            l2r :: a -> b
          
          instance FD Bool Nat where
            meth = not
            l2r False = 0
            l2r True = 1 |]
  ======>
    class FD a b | a -> b where
      meth :: a -> a
      l2r :: a -> b
    instance FD Bool Nat where
      meth = not
      l2r False = 0
      l2r True = 1
    t1 = meth True
    type T1Sym0 = T1
    type family T1 where
      T1 = Apply MethSym0 TrueSym0
    type MethSym0 :: forall a. (~>) a a
    data MethSym0 a0123456789876543210
      where
        MethSym0KindInference :: SameKind (Apply MethSym0 arg) (MethSym1 arg) =>
                                 MethSym0 a0123456789876543210
    type instance Apply MethSym0 a0123456789876543210 = MethSym1 a0123456789876543210
    instance SuppressUnusedWarnings MethSym0 where
      suppressUnusedWarnings = snd (((,) MethSym0KindInference) ())
    type MethSym1 (a0123456789876543210 :: a) =
        Meth a0123456789876543210 :: a
    type L2rSym0 :: forall a b. (~>) a b
    data L2rSym0 a0123456789876543210
      where
        L2rSym0KindInference :: SameKind (Apply L2rSym0 arg) (L2rSym1 arg) =>
                                L2rSym0 a0123456789876543210
    type instance Apply L2rSym0 a0123456789876543210 = L2rSym1 a0123456789876543210
    instance SuppressUnusedWarnings L2rSym0 where
      suppressUnusedWarnings = snd (((,) L2rSym0KindInference) ())
    type L2rSym1 (a0123456789876543210 :: a) =
        L2r a0123456789876543210 :: b
    class PFD a b | a -> b where
      type Meth (arg :: a) :: a
      type L2r (arg :: a) :: b
    type Meth_0123456789876543210 :: Bool -> Bool
    type family Meth_0123456789876543210 a where
      Meth_0123456789876543210 a_0123456789876543210 = Apply NotSym0 a_0123456789876543210
    type Meth_0123456789876543210Sym0 :: (~>) Bool Bool
    data Meth_0123456789876543210Sym0 a0123456789876543210
      where
        Meth_0123456789876543210Sym0KindInference :: SameKind (Apply Meth_0123456789876543210Sym0 arg) (Meth_0123456789876543210Sym1 arg) =>
                                                     Meth_0123456789876543210Sym0 a0123456789876543210
    type instance Apply Meth_0123456789876543210Sym0 a0123456789876543210 = Meth_0123456789876543210Sym1 a0123456789876543210
    instance SuppressUnusedWarnings Meth_0123456789876543210Sym0 where
      suppressUnusedWarnings
        = snd (((,) Meth_0123456789876543210Sym0KindInference) ())
    type Meth_0123456789876543210Sym1 (a0123456789876543210 :: Bool) =
        Meth_0123456789876543210 a0123456789876543210 :: Bool
    type L2r_0123456789876543210 :: Bool -> Nat
    type family L2r_0123456789876543210 a where
      L2r_0123456789876543210 'False = FromInteger 0
      L2r_0123456789876543210 'True = FromInteger 1
    type L2r_0123456789876543210Sym0 :: (~>) Bool Nat
    data L2r_0123456789876543210Sym0 a0123456789876543210
      where
        L2r_0123456789876543210Sym0KindInference :: SameKind (Apply L2r_0123456789876543210Sym0 arg) (L2r_0123456789876543210Sym1 arg) =>
                                                    L2r_0123456789876543210Sym0 a0123456789876543210
    type instance Apply L2r_0123456789876543210Sym0 a0123456789876543210 = L2r_0123456789876543210Sym1 a0123456789876543210
    instance SuppressUnusedWarnings L2r_0123456789876543210Sym0 where
      suppressUnusedWarnings
        = snd (((,) L2r_0123456789876543210Sym0KindInference) ())
    type L2r_0123456789876543210Sym1 (a0123456789876543210 :: Bool) =
        L2r_0123456789876543210 a0123456789876543210 :: Nat
    instance PFD Bool Nat where
      type Meth a = Apply Meth_0123456789876543210Sym0 a
      type L2r a = Apply L2r_0123456789876543210Sym0 a
    sT1 :: Sing @_ T1Sym0
    sT1 = (applySing ((singFun1 @MethSym0) sMeth)) STrue
    class SFD a b | a -> b where
      sMeth :: forall (t :: a). Sing t -> Sing (Apply MethSym0 t :: a)
      sL2r :: forall (t :: a). Sing t -> Sing (Apply L2rSym0 t :: b)
    instance SFD Bool Nat where
      sMeth ::
        forall (t :: Bool). Sing t -> Sing (Apply MethSym0 t :: Bool)
      sL2r :: forall (t :: Bool). Sing t -> Sing (Apply L2rSym0 t :: Nat)
      sMeth (sA_0123456789876543210 :: Sing a_0123456789876543210)
        = (applySing ((singFun1 @NotSym0) sNot)) sA_0123456789876543210
      sL2r SFalse = sFromInteger (sing :: Sing 0)
      sL2r STrue = sFromInteger (sing :: Sing 1)
    instance SFD a b => SingI (MethSym0 :: (~>) a a) where
      sing = (singFun1 @MethSym0) sMeth
    instance SFD a b => SingI (L2rSym0 :: (~>) a b) where
      sing = (singFun1 @L2rSym0) sL2r