singletons-base-3.3: A promoted and singled version of the base library
Copyright(C) 2020 Ryan Scott
LicenseBSD-style (see LICENSE)
MaintainerRichard Eisenberg (rae@cs.brynmawr.edu)
Stabilityexperimental
Portabilitynon-portable
Safe HaskellNone
LanguageGHC2021

Data.Proxy.Singletons

Description

Exports promoted and singled versions of the definitions in Data.Proxy.

Synopsis

The Proxy singleton

type family Sing :: k -> Type #

Instances

Instances details
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SAll
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SAny
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SVoid
type Sing Source # 
Instance details

Defined in GHC.TypeLits.Singletons.Internal

type Sing = SNat
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing Source # 
Instance details

Defined in Data.Singletons.Base.TypeError

type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple0
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SBool
type Sing Source # 
Instance details

Defined in GHC.TypeLits.Singletons.Internal

type Sing = SChar
type Sing Source # 
Instance details

Defined in GHC.TypeLits.Singletons.Internal

type Sing = SSymbol
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SIdentity :: Identity a -> Type
type Sing Source # 
Instance details

Defined in Data.Monoid.Singletons

type Sing = SFirst :: First a -> Type
type Sing Source # 
Instance details

Defined in Data.Monoid.Singletons

type Sing = SLast :: Last a -> Type
type Sing Source # 
Instance details

Defined in Data.Ord.Singletons

type Sing = SDown :: Down a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SFirst :: First a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SLast :: Last a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SMax :: Max a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SMin :: Min a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SDual :: Dual a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SProduct :: Product a -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons.Internal.Wrappers

type Sing = SSum :: Sum a -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SNonEmpty :: NonEmpty a -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SMaybe :: Maybe a -> Type
type Sing Source #

A choice of singleton for the kind TYPE rep (for some RuntimeRep rep), an instantiation of which is the famous kind Type.

Conceivably, one could generalize this instance to `Sing @k` for any kind k, and remove all other Sing instances. We don't adopt this design, however, since it is far more convenient in practice to work with explicit singleton values than TypeReps (for instance, TypeReps are more difficult to pattern match on, and require extra runtime checks).

We cannot produce explicit singleton values for everything in TYPE rep, however, since it is an open kind, so we reach for TypeRep in this one particular case.

Instance details

Defined in Data.Singletons.Base.TypeRepTYPE

type Sing = TypeRep :: TYPE rep -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SList :: [a] -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = SEither :: Either a b -> Type
type Sing Source # 
Instance details

Defined in Data.Proxy.Singletons

type Sing = SProxy :: Proxy t -> Type
type Sing Source # 
Instance details

Defined in Data.Semigroup.Singletons

type Sing = SArg :: Arg a b -> Type
type Sing 
Instance details

Defined in Data.Singletons

type Sing 
Instance details

Defined in Data.Singletons

type Sing = SLambda :: (k1 ~> k2) -> Type
type Sing 
Instance details

Defined in Data.Singletons.Sigma

type Sing = SSigma :: Sigma s t -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple2 :: (a, b) -> Type
type Sing Source # 
Instance details

Defined in Data.Functor.Const.Singletons

type Sing = SConst :: Const a b -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple3 :: (a, b, c) -> Type
type Sing Source # 
Instance details

Defined in Data.Functor.Product.Singletons

type Sing = SProduct :: Product f g a -> Type
type Sing Source # 
Instance details

Defined in Data.Functor.Sum.Singletons

type Sing = SSum :: Sum f g a -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple4 :: (a, b, c, d) -> Type
type Sing Source # 
Instance details

Defined in Data.Functor.Compose.Singletons

type Sing = SCompose :: Compose f g a -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple5 :: (a, b, c, d, e) -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple6 :: (a, b, c, d, e, f) -> Type
type Sing Source # 
Instance details

Defined in Data.Singletons.Base.Instances

type Sing = STuple7 :: (a, b, c, d, e, f, g) -> Type

data SProxy (a :: Proxy t) where Source #

Constructors

SProxy :: forall {k} (t :: k). SProxy ('Proxy :: Proxy t) 

Instances

Instances details
TestCoercion (SProxy :: Proxy t -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

testCoercion :: forall (a :: Proxy t) (b :: Proxy t). SProxy a -> SProxy b -> Maybe (Coercion a b) #

TestEquality (SProxy :: Proxy t -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

testEquality :: forall (a :: Proxy t) (b :: Proxy t). SProxy a -> SProxy b -> Maybe (a :~: b) #

Show (SProxy z) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

showsPrec :: Int -> SProxy z -> ShowS #

show :: SProxy z -> String #

showList :: [SProxy z] -> ShowS #

Eq (SProxy z) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

(==) :: SProxy z -> SProxy z -> Bool #

(/=) :: SProxy z -> SProxy z -> Bool #

Ord (SProxy z) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

compare :: SProxy z -> SProxy z -> Ordering #

(<) :: SProxy z -> SProxy z -> Bool #

(<=) :: SProxy z -> SProxy z -> Bool #

(>) :: SProxy z -> SProxy z -> Bool #

(>=) :: SProxy z -> SProxy z -> Bool #

max :: SProxy z -> SProxy z -> SProxy z #

min :: SProxy z -> SProxy z -> SProxy z #

type family AsProxyTypeOf (a1 :: a) (a2 :: proxy a) :: a where ... Source #

Equations

AsProxyTypeOf (a_6989586621680355901 :: k2) (a_6989586621680355903 :: proxy k2) = Apply (Apply (ConstSym0 :: TyFun k2 (proxy k2 ~> k2) -> Type) a_6989586621680355901) a_6989586621680355903 

sAsProxyTypeOf :: forall a (proxy :: Type -> Type) (t1 :: a) (t2 :: proxy a). Sing t1 -> Sing t2 -> Sing (Apply (Apply (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) t1) t2) Source #

Defunctionalization symbols

type family ProxySym0 :: Proxy t where ... Source #

Equations

ProxySym0 = 'Proxy :: Proxy t 

data AsProxyTypeOfSym0 (a1 :: TyFun a (proxy a ~> a)) Source #

Instances

Instances details
SingI (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

sing :: Sing (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) #

SuppressUnusedWarnings (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

type Apply (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) (a6989586621680355908 :: a) Source # 
Instance details

Defined in Data.Proxy.Singletons

type Apply (AsProxyTypeOfSym0 :: TyFun a (proxy a ~> a) -> Type) (a6989586621680355908 :: a) = AsProxyTypeOfSym1 a6989586621680355908 :: TyFun (proxy a) a -> Type

data AsProxyTypeOfSym1 (a6989586621680355908 :: a) (b :: TyFun (proxy a) a) Source #

Instances

Instances details
SingI1 (AsProxyTypeOfSym1 :: a -> TyFun (proxy a) a -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

liftSing :: forall (x :: a). Sing x -> Sing (AsProxyTypeOfSym1 x :: TyFun (proxy a) a -> Type) #

SingI d => SingI (AsProxyTypeOfSym1 d :: TyFun (proxy a) a -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

Methods

sing :: Sing (AsProxyTypeOfSym1 d :: TyFun (proxy a) a -> Type) #

SuppressUnusedWarnings (AsProxyTypeOfSym1 a6989586621680355908 :: TyFun (proxy a) a -> Type) Source # 
Instance details

Defined in Data.Proxy.Singletons

type Apply (AsProxyTypeOfSym1 a6989586621680355908 :: TyFun (proxy a) a -> Type) (a6989586621680355909 :: proxy a) Source # 
Instance details

Defined in Data.Proxy.Singletons

type Apply (AsProxyTypeOfSym1 a6989586621680355908 :: TyFun (proxy a) a -> Type) (a6989586621680355909 :: proxy a) = AsProxyTypeOf a6989586621680355908 a6989586621680355909

type family AsProxyTypeOfSym2 (a6989586621680355908 :: a) (a6989586621680355909 :: proxy a) :: a where ... Source #

Equations

AsProxyTypeOfSym2 (a6989586621680355908 :: a) (a6989586621680355909 :: proxy a) = AsProxyTypeOf a6989586621680355908 a6989586621680355909 

Orphan instances

PAlternative (Proxy :: k -> Type) Source # 
Instance details

PMonadPlus (Proxy :: k -> Type) Source # 
Instance details

PApplicative (Proxy :: Type -> Type) Source # 
Instance details

Associated Types

type Pure (a :: k1) 
Instance details

Defined in Data.Proxy.Singletons

type Pure (a :: k1)
type (a2 :: Proxy (a1 ~> b)) <*> (a3 :: Proxy a1) 
Instance details

Defined in Data.Proxy.Singletons

type (a2 :: Proxy (a1 ~> b)) <*> (a3 :: Proxy a1)
type LiftA2 (arg :: a ~> (b ~> c)) (arg1 :: Proxy a) (arg2 :: Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type LiftA2 (arg :: a ~> (b ~> c)) (arg1 :: Proxy a) (arg2 :: Proxy b)
type (arg :: Proxy a) *> (arg1 :: Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type (arg :: Proxy a) *> (arg1 :: Proxy b)
type (arg :: Proxy a) <* (arg1 :: Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type (arg :: Proxy a) <* (arg1 :: Proxy b)
PFunctor (Proxy :: Type -> Type) Source # 
Instance details

Associated Types

type Fmap (a2 :: a1 ~> b) (a3 :: Proxy a1) 
Instance details

Defined in Data.Proxy.Singletons

type Fmap (a2 :: a1 ~> b) (a3 :: Proxy a1)
type (arg :: a) <$ (arg1 :: Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type (arg :: a) <$ (arg1 :: Proxy b)
PMonad (Proxy :: Type -> Type) Source # 
Instance details

Associated Types

type (a2 :: Proxy a1) >>= (a3 :: a1 ~> Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type (a2 :: Proxy a1) >>= (a3 :: a1 ~> Proxy b)
type (arg :: Proxy a) >> (arg1 :: Proxy b) 
Instance details

Defined in Data.Proxy.Singletons

type (arg :: Proxy a) >> (arg1 :: Proxy b)
type Return (arg :: a) 
Instance details

Defined in Data.Proxy.Singletons

type Return (arg :: a)
SAlternative (Proxy :: Type -> Type) Source # 
Instance details

Methods

sEmpty :: Sing (EmptySym0 :: Proxy a) Source #

(%<|>) :: forall a (t1 :: Proxy a) (t2 :: Proxy a). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<|>@#@$) :: TyFun (Proxy a) (Proxy a ~> Proxy a) -> Type) t1) t2) Source #

SApplicative (Proxy :: Type -> Type) Source # 
Instance details

Methods

sPure :: forall a (t :: a). Sing t -> Sing (Apply (PureSym0 :: TyFun a (Proxy a) -> Type) t) Source #

(%<*>) :: forall a b (t1 :: Proxy (a ~> b)) (t2 :: Proxy a). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<*>@#@$) :: TyFun (Proxy (a ~> b)) (Proxy a ~> Proxy b) -> Type) t1) t2) Source #

sLiftA2 :: forall a b c (t1 :: a ~> (b ~> c)) (t2 :: Proxy a) (t3 :: Proxy b). Sing t1 -> Sing t2 -> Sing t3 -> Sing (Apply (Apply (Apply (LiftA2Sym0 :: TyFun (a ~> (b ~> c)) (Proxy a ~> (Proxy b ~> Proxy c)) -> Type) t1) t2) t3) Source #

(%*>) :: forall a b (t1 :: Proxy a) (t2 :: Proxy b). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((*>@#@$) :: TyFun (Proxy a) (Proxy b ~> Proxy b) -> Type) t1) t2) Source #

(%<*) :: forall a b (t1 :: Proxy a) (t2 :: Proxy b). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<*@#@$) :: TyFun (Proxy a) (Proxy b ~> Proxy a) -> Type) t1) t2) Source #

SFunctor (Proxy :: Type -> Type) Source # 
Instance details

Methods

sFmap :: forall a b (t1 :: a ~> b) (t2 :: Proxy a). Sing t1 -> Sing t2 -> Sing (Apply (Apply (FmapSym0 :: TyFun (a ~> b) (Proxy a ~> Proxy b) -> Type) t1) t2) Source #

(%<$) :: forall a b (t1 :: a) (t2 :: Proxy b). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<$@#@$) :: TyFun a (Proxy b ~> Proxy a) -> Type) t1) t2) Source #

SMonad (Proxy :: Type -> Type) Source # 
Instance details

Methods

(%>>=) :: forall a b (t1 :: Proxy a) (t2 :: a ~> Proxy b). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((>>=@#@$) :: TyFun (Proxy a) ((a ~> Proxy b) ~> Proxy b) -> Type) t1) t2) Source #

(%>>) :: forall a b (t1 :: Proxy a) (t2 :: Proxy b). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((>>@#@$) :: TyFun (Proxy a) (Proxy b ~> Proxy b) -> Type) t1) t2) Source #

sReturn :: forall a (t :: a). Sing t -> Sing (Apply (ReturnSym0 :: TyFun a (Proxy a) -> Type) t) Source #

SMonadPlus (Proxy :: Type -> Type) Source # 
Instance details

Methods

sMzero :: Sing (MzeroSym0 :: Proxy a) Source #

sMplus :: forall a (t1 :: Proxy a) (t2 :: Proxy a). Sing t1 -> Sing t2 -> Sing (Apply (Apply (MplusSym0 :: TyFun (Proxy a) (Proxy a ~> Proxy a) -> Type) t1) t2) Source #

SingKind (Proxy t) Source # 
Instance details

Associated Types

type Demote (Proxy t) 
Instance details

Defined in Data.Proxy.Singletons

type Demote (Proxy t) = Proxy t

Methods

fromSing :: forall (a :: Proxy t). Sing a -> Demote (Proxy t) #

toSing :: Demote (Proxy t) -> SomeSing (Proxy t) #

SDecide (Proxy t) Source # 
Instance details

Methods

(%~) :: forall (a :: Proxy t) (b :: Proxy t). Sing a -> Sing b -> Decision (a :~: b) #

PEq (Proxy s) Source # 
Instance details

SEq (Proxy s) Source # 
Instance details

Methods

(%==) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((==@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

(%/=) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((/=@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

PMonoid (Proxy s) Source # 
Instance details

Associated Types

type Mempty 
Instance details

Defined in Data.Proxy.Singletons

type Mempty
SMonoid (Proxy s) Source # 
Instance details

Methods

sMempty :: Sing (MemptySym0 :: Proxy s) Source #

sMappend :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply (MappendSym0 :: TyFun (Proxy s) (Proxy s ~> Proxy s) -> Type) t1) t2) Source #

sMconcat :: forall (t :: [Proxy s]). Sing t -> Sing (Apply (MconcatSym0 :: TyFun [Proxy s] (Proxy s) -> Type) t) Source #

POrd (Proxy s) Source # 
Instance details

SOrd (Proxy s) Source # 
Instance details

Methods

sCompare :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply (CompareSym0 :: TyFun (Proxy s) (Proxy s ~> Ordering) -> Type) t1) t2) Source #

(%<) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

(%<=) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<=@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

(%>) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((>@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

(%>=) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((>=@#@$) :: TyFun (Proxy s) (Proxy s ~> Bool) -> Type) t1) t2) Source #

sMax :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply (MaxSym0 :: TyFun (Proxy s) (Proxy s ~> Proxy s) -> Type) t1) t2) Source #

sMin :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply (MinSym0 :: TyFun (Proxy s) (Proxy s ~> Proxy s) -> Type) t1) t2) Source #

PSemigroup (Proxy s) Source # 
Instance details

SSemigroup (Proxy s) Source # 
Instance details

Methods

(%<>) :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply ((<>@#@$) :: TyFun (Proxy s) (Proxy s ~> Proxy s) -> Type) t1) t2) Source #

sSconcat :: forall (t :: NonEmpty (Proxy s)). Sing t -> Sing (Apply (SconcatSym0 :: TyFun (NonEmpty (Proxy s)) (Proxy s) -> Type) t) Source #

PBounded (Proxy s) Source # 
Instance details

Associated Types

type MinBound 
Instance details

Defined in Data.Proxy.Singletons

type MaxBound 
Instance details

Defined in Data.Proxy.Singletons

PEnum (Proxy s) Source # 
Instance details

SBounded (Proxy s) Source # 
Instance details

SEnum (Proxy s) Source # 
Instance details

Methods

sSucc :: forall (t :: Proxy s). Sing t -> Sing (Apply (SuccSym0 :: TyFun (Proxy s) (Proxy s) -> Type) t) Source #

sPred :: forall (t :: Proxy s). Sing t -> Sing (Apply (PredSym0 :: TyFun (Proxy s) (Proxy s) -> Type) t) Source #

sToEnum :: forall (t :: Natural). Sing t -> Sing (Apply (ToEnumSym0 :: TyFun Natural (Proxy s) -> Type) t) Source #

sFromEnum :: forall (t :: Proxy s). Sing t -> Sing (Apply (FromEnumSym0 :: TyFun (Proxy s) Natural -> Type) t) Source #

sEnumFromTo :: forall (t1 :: Proxy s) (t2 :: Proxy s). Sing t1 -> Sing t2 -> Sing (Apply (Apply (EnumFromToSym0 :: TyFun (Proxy s) (Proxy s ~> [Proxy s]) -> Type) t1) t2) Source #

sEnumFromThenTo :: forall (t1 :: Proxy s) (t2 :: Proxy s) (t3 :: Proxy s). Sing t1 -> Sing t2 -> Sing t3 -> Sing (Apply (Apply (Apply (EnumFromThenToSym0 :: TyFun (Proxy s) (Proxy s ~> (Proxy s ~> [Proxy s])) -> Type) t1) t2) t3) Source #

PShow (Proxy s) Source # 
Instance details

SShow (Proxy s) Source # 
Instance details

Methods

sShowsPrec :: forall (t1 :: Natural) (t2 :: Proxy s) (t3 :: Symbol). Sing t1 -> Sing t2 -> Sing t3 -> Sing (Apply (Apply (Apply (ShowsPrecSym0 :: TyFun Natural (Proxy s ~> (Symbol ~> Symbol)) -> Type) t1) t2) t3) Source #

sShow_ :: forall (t :: Proxy s). Sing t -> Sing (Apply (Show_Sym0 :: TyFun (Proxy s) Symbol -> Type) t) Source #

sShowList :: forall (t1 :: [Proxy s]) (t2 :: Symbol). Sing t1 -> Sing t2 -> Sing (Apply (Apply (ShowListSym0 :: TyFun [Proxy s] (Symbol ~> Symbol) -> Type) t1) t2) Source #

SingI ('Proxy :: Proxy t) Source # 
Instance details

Methods

sing :: Sing ('Proxy :: Proxy t) #