Safe Haskell	Safe-Inferred
Language	Haskell2010

Ouroboros.Consensus.Util.RedundantConstraints

Contents

Convenience re-export

Synopsis

keepRedundantConstraint ∷ c ⇒ proxy c → ()
data Proxy (t ∷ k) = Proxy

Documentation

keepRedundantConstraint ∷ c ⇒ proxy c → () Source #

Can be used to silence individual "redundant constraint" warnings

foo :: ConstraintUsefulForDebugging => ...
foo =
    ..
  where
    _ = keepRedundantConstraint (Proxy @ConstraintUsefulForDebugging))

Convenience re-export

data Proxy (t ∷ k) #

Proxy is a type that holds no data, but has a phantom parameter of arbitrary type (or even kind). Its use is to provide type information, even though there is no value available of that type (or it may be too costly to create one).

Historically, Proxy :: Proxy a is a safer alternative to the undefined :: a idiom.

>>> Proxy :: Proxy (Void, Int -> Int)
Proxy

Proxy can even hold types of higher kinds,

>>> Proxy :: Proxy Either
Proxy

>>> Proxy :: Proxy Functor
Proxy

>>> Proxy :: Proxy complicatedStructure
Proxy

Constructors

Proxy

Instances

Instances details

ApplicativeB (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.ApplicativeB

Methods

bpure ∷ (∀ (a ∷ k). f a) → Proxy f Source #

bprod ∷ ∀ (f ∷ k → Type) (g ∷ k → Type). Proxy f → Proxy g → Proxy (Product f g) Source #

ConstraintsB (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.ConstraintsB

Methods

baddDicts ∷ ∀ (c ∷ k → Constraint) (f ∷ k → Type). AllB c (Proxy ∷ (k → Type) → Type) ⇒ Proxy f → Proxy (Product (Dict c) f) Source #

DistributiveB (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.DistributiveB

Methods

bdistribute ∷ ∀ f (g ∷ k → Type). Functor f ⇒ f (Proxy g) → Proxy (Compose f g) Source #

FunctorB (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.FunctorB

Methods

bmap ∷ (∀ (a ∷ k). f a → g a) → Proxy f → Proxy g Source #

TraversableB (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.TraversableB

Methods

btraverse ∷ Applicative e ⇒ (∀ (a ∷ k). f a → e (g a)) → Proxy f → e (Proxy g) Source #

Generic1 (Proxy ∷ k → Type)

Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep1 (Proxy ∷ k → Type)	@since base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep1 (Proxy ∷ k → Type) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 ∷ k → Type))

Methods

from1 ∷ ∀ (a ∷ k). Proxy a → Rep1 (Proxy ∷ k → Type) a #

to1 ∷ ∀ (a ∷ k). Rep1 (Proxy ∷ k → Type) a → Proxy a #

RepeatWithIndex Void (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

irepeat ∷ (Void → a) → Proxy a Source #

SemialignWithIndex Void (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

ialignWith ∷ (Void → These a b → c) → Proxy a → Proxy b → Proxy c Source #

ZipWithIndex Void (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

izipWith ∷ (Void → a → b → c) → Proxy a → Proxy b → Proxy c Source #

Representable (Proxy ∷ Type → Type)

Instance details

Defined in Data.Functor.Rep

Associated Types

type Rep (Proxy ∷ Type → Type)
Instance details Defined in Data.Functor.Rep type Rep (Proxy ∷ Type → Type) = Void

Methods

tabulate ∷ (Rep (Proxy ∷ Type → Type) → a) → Proxy a Source #

index ∷ Proxy a → Rep (Proxy ∷ Type → Type) → a Source #

FromJSON1 (Proxy ∷ Type → Type)

Instance details

Defined in Data.Aeson.Types.FromJSON

Methods

liftParseJSON ∷ Maybe a → (Value → Parser a) → (Value → Parser [a]) → Value → Parser (Proxy a) Source #

liftParseJSONList ∷ Maybe a → (Value → Parser a) → (Value → Parser [a]) → Value → Parser [Proxy a] Source #

liftOmittedField ∷ Maybe a → Maybe (Proxy a) Source #

ToJSON1 (Proxy ∷ Type → Type)

Instance details

Defined in Data.Aeson.Types.ToJSON

Methods

liftToJSON ∷ (a → Bool) → (a → Value) → ([a] → Value) → Proxy a → Value Source #

liftToJSONList ∷ (a → Bool) → (a → Value) → ([a] → Value) → [Proxy a] → Value Source #

liftToEncoding ∷ (a → Bool) → (a → Encoding) → ([a] → Encoding) → Proxy a → Encoding Source #

liftToEncodingList ∷ (a → Bool) → (a → Encoding) → ([a] → Encoding) → [Proxy a] → Encoding Source #

liftOmitField ∷ (a → Bool) → Proxy a → Bool Source #

MonadZip (Proxy ∷ Type → Type)

Since: base-4.9.0.0

Instance details

Defined in Control.Monad.Zip

Methods

mzip ∷ Proxy a → Proxy b → Proxy (a, b) #

mzipWith ∷ (a → b → c) → Proxy a → Proxy b → Proxy c #

munzip ∷ Proxy (a, b) → (Proxy a, Proxy b) #

Eq1 (Proxy ∷ Type → Type)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftEq ∷ (a → b → Bool) → Proxy a → Proxy b → Bool #

Ord1 (Proxy ∷ Type → Type)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftCompare ∷ (a → b → Ordering) → Proxy a → Proxy b → Ordering #

Read1 (Proxy ∷ Type → Type)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftReadsPrec ∷ (Int → ReadS a) → ReadS [a] → Int → ReadS (Proxy a) #

liftReadList ∷ (Int → ReadS a) → ReadS [a] → ReadS [Proxy a] #

liftReadPrec ∷ ReadPrec a → ReadPrec [a] → ReadPrec (Proxy a) #

liftReadListPrec ∷ ReadPrec a → ReadPrec [a] → ReadPrec [Proxy a] #

Show1 (Proxy ∷ Type → Type)

Since: base-4.9.0.0

Instance details

Defined in Data.Functor.Classes

Methods

liftShowsPrec ∷ (Int → a → ShowS) → ([a] → ShowS) → Int → Proxy a → ShowS #

liftShowList ∷ (Int → a → ShowS) → ([a] → ShowS) → [Proxy a] → ShowS #

Contravariant (Proxy ∷ Type → Type)

Instance details

Defined in Data.Functor.Contravariant

Methods

contramap ∷ (a' → a) → Proxy a → Proxy a' #

(>$) ∷ b → Proxy b → Proxy a #

NFData1 (Proxy ∷ Type → Type)

Since: deepseq-1.4.3.0

Instance details

Defined in Control.DeepSeq

Methods

liftRnf ∷ (a → ()) → Proxy a → () #

Alternative (Proxy ∷ Type → Type)

@since base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

empty ∷ Proxy a #

(<|>) ∷ Proxy a → Proxy a → Proxy a #

some ∷ Proxy a → Proxy [a] #

many ∷ Proxy a → Proxy [a] #

Applicative (Proxy ∷ Type → Type)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

pure ∷ a → Proxy a #

(<*>) ∷ Proxy (a → b) → Proxy a → Proxy b #

liftA2 ∷ (a → b → c) → Proxy a → Proxy b → Proxy c #

(*>) ∷ Proxy a → Proxy b → Proxy b #

(<*) ∷ Proxy a → Proxy b → Proxy a #

Functor (Proxy ∷ Type → Type)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

fmap ∷ (a → b) → Proxy a → Proxy b #

(<$) ∷ a → Proxy b → Proxy a #

Monad (Proxy ∷ Type → Type)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

(>>=) ∷ Proxy a → (a → Proxy b) → Proxy b #

(>>) ∷ Proxy a → Proxy b → Proxy b #

return ∷ a → Proxy a #

MonadPlus (Proxy ∷ Type → Type)

@since base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

mzero ∷ Proxy a #

mplus ∷ Proxy a → Proxy a → Proxy a #

Foldable (Proxy ∷ Type → Type)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Foldable

Methods

fold ∷ Monoid m ⇒ Proxy m → m #

foldMap ∷ Monoid m ⇒ (a → m) → Proxy a → m #

foldMap' ∷ Monoid m ⇒ (a → m) → Proxy a → m #

foldr ∷ (a → b → b) → b → Proxy a → b #

foldr' ∷ (a → b → b) → b → Proxy a → b #

foldl ∷ (b → a → b) → b → Proxy a → b #

foldl' ∷ (b → a → b) → b → Proxy a → b #

foldr1 ∷ (a → a → a) → Proxy a → a #

foldl1 ∷ (a → a → a) → Proxy a → a #

toList ∷ Proxy a → [a] #

null ∷ Proxy a → Bool #

length ∷ Proxy a → Int #

elem ∷ Eq a ⇒ a → Proxy a → Bool #

maximum ∷ Ord a ⇒ Proxy a → a #

minimum ∷ Ord a ⇒ Proxy a → a #

sum ∷ Num a ⇒ Proxy a → a #

product ∷ Num a ⇒ Proxy a → a #

Traversable (Proxy ∷ Type → Type)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Traversable

Methods

traverse ∷ Applicative f ⇒ (a → f b) → Proxy a → f (Proxy b) #

sequenceA ∷ Applicative f ⇒ Proxy (f a) → f (Proxy a) #

mapM ∷ Monad m ⇒ (a → m b) → Proxy a → m (Proxy b) #

sequence ∷ Monad m ⇒ Proxy (m a) → m (Proxy a) #

Hashable1 (Proxy ∷ Type → Type)

Instance details

Defined in Data.Hashable.Class

Methods

liftHashWithSalt ∷ (Int → a → Int) → Int → Proxy a → Int Source #

Align (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

nil ∷ Proxy a Source #

Repeat (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

repeat ∷ a → Proxy a Source #

Semialign (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

align ∷ Proxy a → Proxy b → Proxy (These a b) Source #

alignWith ∷ (These a b → c) → Proxy a → Proxy b → Proxy c Source #

Unalign (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

unalign ∷ Proxy (These a b) → (Proxy a, Proxy b) Source #

unalignWith ∷ (c → These a b) → Proxy c → (Proxy a, Proxy b) Source #

Unzip (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

unzipWith ∷ (c → (a, b)) → Proxy c → (Proxy a, Proxy b) Source #

unzip ∷ Proxy (a, b) → (Proxy a, Proxy b) Source #

Zip (Proxy ∷ Type → Type)

Instance details

Defined in Data.Semialign.Internal

Methods

zip ∷ Proxy a → Proxy b → Proxy (a, b) Source #

zipWith ∷ (a → b → c) → Proxy a → Proxy b → Proxy c Source #

FromJSON (Proxy a)

Instance details

Defined in Data.Aeson.Types.FromJSON

Methods

parseJSON ∷ Value → Parser (Proxy a) Source #

parseJSONList ∷ Value → Parser [Proxy a] Source #

omittedField ∷ Maybe (Proxy a) Source #

ToJSON (Proxy a)

Instance details

Defined in Data.Aeson.Types.ToJSON

Methods

toJSON ∷ Proxy a → Value Source #

toEncoding ∷ Proxy a → Encoding Source #

toJSONList ∷ [Proxy a] → Value Source #

toEncodingList ∷ [Proxy a] → Encoding Source #

omitField ∷ Proxy a → Bool Source #

NFData (Proxy a)

Since: deepseq-1.4.0.0

Instance details

Defined in Control.DeepSeq

Methods

rnf ∷ Proxy a → () #

Monoid (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

mempty ∷ Proxy s #

mappend ∷ Proxy s → Proxy s → Proxy s #

mconcat ∷ [Proxy s] → Proxy s #

Semigroup (Proxy s)

@since base-4.9.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

(<>) ∷ Proxy s → Proxy s → Proxy s #

sconcat ∷ NonEmpty (Proxy s) → Proxy s #

stimes ∷ Integral b ⇒ b → Proxy s → Proxy s #

Bounded (Proxy t)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

minBound ∷ Proxy t #

maxBound ∷ Proxy t #

Enum (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

succ ∷ Proxy s → Proxy s #

pred ∷ Proxy s → Proxy s #

toEnum ∷ Int → Proxy s #

fromEnum ∷ Proxy s → Int #

enumFrom ∷ Proxy s → [Proxy s] #

enumFromThen ∷ Proxy s → Proxy s → [Proxy s] #

enumFromTo ∷ Proxy s → Proxy s → [Proxy s] #

enumFromThenTo ∷ Proxy s → Proxy s → Proxy s → [Proxy s] #

Generic (Proxy t)

Instance details

Defined in GHC.Internal.Generics

Associated Types

type Rep (Proxy t)	@since base-4.6.0.0
Instance details Defined in GHC.Internal.Generics type Rep (Proxy t) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 ∷ Type → Type))

Methods

from ∷ Proxy t → Rep (Proxy t) x #

to ∷ Rep (Proxy t) x → Proxy t #

Ix (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

range ∷ (Proxy s, Proxy s) → [Proxy s] #

index ∷ (Proxy s, Proxy s) → Proxy s → Int #

unsafeIndex ∷ (Proxy s, Proxy s) → Proxy s → Int #

inRange ∷ (Proxy s, Proxy s) → Proxy s → Bool #

rangeSize ∷ (Proxy s, Proxy s) → Int #

unsafeRangeSize ∷ (Proxy s, Proxy s) → Int #

Read (Proxy t)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

readsPrec ∷ Int → ReadS (Proxy t) #

readList ∷ ReadS [Proxy t] #

readPrec ∷ ReadPrec (Proxy t) #

readListPrec ∷ ReadPrec [Proxy t] #

Show (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

showsPrec ∷ Int → Proxy s → ShowS #

show ∷ Proxy s → String #

showList ∷ [Proxy s] → ShowS #

Eq (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

(==) ∷ Proxy s → Proxy s → Bool #

(/=) ∷ Proxy s → Proxy s → Bool #

Ord (Proxy s)

@since base-4.7.0.0

Instance details

Defined in GHC.Internal.Data.Proxy

Methods

compare ∷ Proxy s → Proxy s → Ordering #

(<) ∷ Proxy s → Proxy s → Bool #

(<=) ∷ Proxy s → Proxy s → Bool #

(>) ∷ Proxy s → Proxy s → Bool #

(>=) ∷ Proxy s → Proxy s → Bool #

max ∷ Proxy s → Proxy s → Proxy s #

min ∷ Proxy s → Proxy s → Proxy s #

Hashable (Proxy a)

Instance details

Defined in Data.Hashable.Class

Methods

hashWithSalt ∷ Int → Proxy a → Int Source #

hash ∷ Proxy a → Int Source #

MonoFoldable (Proxy a)

Since: mono-traversable-1.0.11.0

Instance details

Defined in Data.MonoTraversable

Methods

ofoldMap ∷ Monoid m ⇒ (Element (Proxy a) → m) → Proxy a → m Source #

ofoldr ∷ (Element (Proxy a) → b → b) → b → Proxy a → b Source #

ofoldl' ∷ (a0 → Element (Proxy a) → a0) → a0 → Proxy a → a0 Source #

otoList ∷ Proxy a → [Element (Proxy a)] Source #

oall ∷ (Element (Proxy a) → Bool) → Proxy a → Bool Source #

oany ∷ (Element (Proxy a) → Bool) → Proxy a → Bool Source #

onull ∷ Proxy a → Bool Source #

olength ∷ Proxy a → Int Source #

olength64 ∷ Proxy a → Int64 Source #

ocompareLength ∷ Integral i ⇒ Proxy a → i → Ordering Source #

otraverse_ ∷ Applicative f ⇒ (Element (Proxy a) → f b) → Proxy a → f () Source #

ofor_ ∷ Applicative f ⇒ Proxy a → (Element (Proxy a) → f b) → f () Source #

omapM_ ∷ Applicative m ⇒ (Element (Proxy a) → m ()) → Proxy a → m () Source #

oforM_ ∷ Applicative m ⇒ Proxy a → (Element (Proxy a) → m ()) → m () Source #

ofoldlM ∷ Monad m ⇒ (a0 → Element (Proxy a) → m a0) → a0 → Proxy a → m a0 Source #

ofoldMap1Ex ∷ Semigroup m ⇒ (Element (Proxy a) → m) → Proxy a → m Source #

ofoldr1Ex ∷ (Element (Proxy a) → Element (Proxy a) → Element (Proxy a)) → Proxy a → Element (Proxy a) Source #

ofoldl1Ex' ∷ (Element (Proxy a) → Element (Proxy a) → Element (Proxy a)) → Proxy a → Element (Proxy a) Source #

headEx ∷ Proxy a → Element (Proxy a) Source #

lastEx ∷ Proxy a → Element (Proxy a) Source #

unsafeHead ∷ Proxy a → Element (Proxy a) Source #

unsafeLast ∷ Proxy a → Element (Proxy a) Source #

maximumByEx ∷ (Element (Proxy a) → Element (Proxy a) → Ordering) → Proxy a → Element (Proxy a) Source #

minimumByEx ∷ (Element (Proxy a) → Element (Proxy a) → Ordering) → Proxy a → Element (Proxy a) Source #

oelem ∷ Element (Proxy a) → Proxy a → Bool Source #

onotElem ∷ Element (Proxy a) → Proxy a → Bool Source #

MonoFunctor (Proxy a)

Since: mono-traversable-1.0.11.0

Instance details

Defined in Data.MonoTraversable

Methods

omap ∷ (Element (Proxy a) → Element (Proxy a)) → Proxy a → Proxy a Source #

MonoPointed (Proxy a)

Since: mono-traversable-1.0.11.0

Instance details

Defined in Data.MonoTraversable

Methods

opoint ∷ Element (Proxy a) → Proxy a Source #

MonoTraversable (Proxy a)

Since: mono-traversable-1.0.11.0

Instance details

Defined in Data.MonoTraversable

Methods

otraverse ∷ Applicative f ⇒ (Element (Proxy a) → f (Element (Proxy a))) → Proxy a → f (Proxy a) Source #

omapM ∷ Applicative m ⇒ (Element (Proxy a) → m (Element (Proxy a))) → Proxy a → m (Proxy a) Source #

MonoidNull (Proxy a)

Since: monoid-subclasses-1.2.5.0

Instance details

Defined in Data.Monoid.Null

Methods

null ∷ Proxy a → Bool Source #

PositiveMonoid (Proxy a)

Since: monoid-subclasses-1.2.5.0

Instance details

Defined in Data.Monoid.Null

Serialise (Proxy a)

Since: serialise-0.2.0.0

Instance details

Defined in Codec.Serialise.Class

Methods

encode ∷ Proxy a → Encoding Source #

decode ∷ Decoder s (Proxy a) Source #

encodeList ∷ [Proxy a] → Encoding Source #

decodeList ∷ Decoder s [Proxy a] Source #

type AllB (c ∷ k → Constraint) (Proxy ∷ (k → Type) → Type)

Instance details

Defined in Barbies.Internal.ConstraintsB

type AllB (c ∷ k → Constraint) (Proxy ∷ (k → Type) → Type) = ()

type Rep1 (Proxy ∷ k → Type)

@since base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep1 (Proxy ∷ k → Type) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 ∷ k → Type))

type Rep (Proxy ∷ Type → Type)

Instance details

Defined in Data.Functor.Rep

type Rep (Proxy ∷ Type → Type) = Void

type Rep (Proxy t)

@since base-4.6.0.0

Instance details

Defined in GHC.Internal.Generics

type Rep (Proxy t) = D1 ('MetaData "Proxy" "GHC.Internal.Data.Proxy" "ghc-internal" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 ∷ Type → Type))

type Element (Proxy a)

Instance details

Defined in Data.MonoTraversable

type Element (Proxy a) = a