ghc-9.10.1: The GHC API
Safe HaskellNone
LanguageGHC2021

GHC.Core.Coercion.Axiom

Description

Module for coercion axioms, used to represent type family instances and newtypes

Synopsis

Documentation

type Branched = 'Branched Source #

type Unbranched = 'Unbranched Source #

fromBranches :: forall (br :: BranchFlag). Branches br -> [CoAxBranch] Source #

numBranches :: forall (br :: BranchFlag). Branches br -> Int Source #

mapAccumBranches :: forall (br :: BranchFlag). ([CoAxBranch] -> CoAxBranch -> CoAxBranch) -> Branches br -> Branches br Source #

The [CoAxBranch] passed into the mapping function is a list of all previous branches, reversed

data CoAxiom (br :: BranchFlag) Source #

A CoAxiom is a "coercion constructor", i.e. a named equality axiom.

Instances

Instances details
NamedThing (CoAxiom br) Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Uniquable (CoAxiom br) Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

getUnique :: CoAxiom br -> Unique Source #

Outputable (CoAxiom br) Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

ppr :: CoAxiom br -> SDoc Source #

Typeable br => Data (CoAxiom br) Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CoAxiom br -> c (CoAxiom br) #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CoAxiom br) #

toConstr :: CoAxiom br -> Constr #

dataTypeOf :: CoAxiom br -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (CoAxiom br)) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CoAxiom br)) #

gmapT :: (forall b. Data b => b -> b) -> CoAxiom br -> CoAxiom br #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CoAxiom br -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CoAxiom br -> r #

gmapQ :: (forall d. Data d => d -> u) -> CoAxiom br -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CoAxiom br -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CoAxiom br -> m (CoAxiom br) #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxiom br -> m (CoAxiom br) #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxiom br -> m (CoAxiom br) #

Eq (CoAxiom br) Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

(==) :: CoAxiom br -> CoAxiom br -> Bool #

(/=) :: CoAxiom br -> CoAxiom br -> Bool #

data CoAxBranch Source #

A branch of a coercion axiom, which provides the evidence for unwrapping a newtype or a type-family reduction step using a single equation.

Constructors

CoAxBranch 

Fields

  • cab_loc :: SrcSpan

    Location of the defining equation See Note [CoAxiom locations]

  • cab_tvs :: [TyVar]

    Bound type variables; not necessarily fresh See Note [CoAxBranch type variables]

  • cab_eta_tvs :: [TyVar]

    Eta-reduced tyvars cab_tvs and cab_lhs may be eta-reduced; see Note [Eta reduction for data families]

  • cab_cvs :: [CoVar]

    Bound coercion variables Always empty, for now. See Note [Constraints in patterns] in GHC.Tc.TyCl

  • cab_roles :: [Role]

    See Note [CoAxBranch roles]

  • cab_lhs :: [Type]

    Type patterns to match against

  • cab_rhs :: Type

    Right-hand side of the equality See Note [CoAxioms are homogeneous]

  • cab_incomps :: [CoAxBranch]

    The previous incompatible branches See Note [Storing compatibility]

Instances

Instances details
Outputable CoAxBranch Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

ppr :: CoAxBranch -> SDoc Source #

Data CoAxBranch Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CoAxBranch -> c CoAxBranch #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c CoAxBranch #

toConstr :: CoAxBranch -> Constr #

dataTypeOf :: CoAxBranch -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c CoAxBranch) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c CoAxBranch) #

gmapT :: (forall b. Data b => b -> b) -> CoAxBranch -> CoAxBranch #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CoAxBranch -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CoAxBranch -> r #

gmapQ :: (forall d. Data d => d -> u) -> CoAxBranch -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CoAxBranch -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CoAxBranch -> m CoAxBranch #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxBranch -> m CoAxBranch #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxBranch -> m CoAxBranch #

coAxiomName :: forall (br :: BranchFlag). CoAxiom br -> Name Source #

coAxiomBranches :: forall (br :: BranchFlag). CoAxiom br -> Branches br Source #

coAxiomTyCon :: forall (br :: BranchFlag). CoAxiom br -> TyCon Source #

isImplicitCoAxiom :: forall (br :: BranchFlag). CoAxiom br -> Bool Source #

coAxiomNumPats :: forall (br :: BranchFlag). CoAxiom br -> Int Source #

coAxiomRole :: forall (br :: BranchFlag). CoAxiom br -> Role Source #

data Role Source #

See Note [Roles] in GHC.Core.Coercion

Order of constructors matters: the Ord instance coincides with the *super*typing relation on roles.

Instances

Instances details
Binary Role Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Outputable Role Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

ppr :: Role -> SDoc Source #

Data Role Source # 
Instance details

Defined in Language.Haskell.Syntax.Basic

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Role -> c Role #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Role #

toConstr :: Role -> Constr #

dataTypeOf :: Role -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Role) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Role) #

gmapT :: (forall b. Data b => b -> b) -> Role -> Role #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Role -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Role -> r #

gmapQ :: (forall d. Data d => d -> u) -> Role -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Role -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Role -> m Role #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Role -> m Role #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Role -> m Role #

Eq Role Source # 
Instance details

Defined in Language.Haskell.Syntax.Basic

Methods

(==) :: Role -> Role -> Bool #

(/=) :: Role -> Role -> Bool #

Ord Role Source # 
Instance details

Defined in Language.Haskell.Syntax.Basic

Methods

compare :: Role -> Role -> Ordering #

(<) :: Role -> Role -> Bool #

(<=) :: Role -> Role -> Bool #

(>) :: Role -> Role -> Bool #

(>=) :: Role -> Role -> Bool #

max :: Role -> Role -> Role #

min :: Role -> Role -> Role #

type Anno (Maybe Role) Source # 
Instance details

Defined in GHC.Hs.Decls

type Anno (Maybe Role) Source # 
Instance details

Defined in GHC.Hs.Decls

data CoAxiomRule Source #

For now, we work only with nominal equality.

Constructors

CoAxiomRule 

Fields

Instances

Instances details
Uniquable CoAxiomRule Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Outputable CoAxiomRule Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

ppr :: CoAxiomRule -> SDoc Source #

Data CoAxiomRule Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CoAxiomRule -> c CoAxiomRule #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c CoAxiomRule #

toConstr :: CoAxiomRule -> Constr #

dataTypeOf :: CoAxiomRule -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c CoAxiomRule) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c CoAxiomRule) #

gmapT :: (forall b. Data b => b -> b) -> CoAxiomRule -> CoAxiomRule #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CoAxiomRule -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CoAxiomRule -> r #

gmapQ :: (forall d. Data d => d -> u) -> CoAxiomRule -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CoAxiomRule -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CoAxiomRule -> m CoAxiomRule #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxiomRule -> m CoAxiomRule #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CoAxiomRule -> m CoAxiomRule #

Eq CoAxiomRule Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

Ord CoAxiomRule Source # 
Instance details

Defined in GHC.Core.Coercion.Axiom

type TypeEqn = Pair Type Source #

A more explicit representation for `t1 ~ t2`.

Orphan instances

Binary Role Source # 
Instance details

Outputable Role Source # 
Instance details

Methods

ppr :: Role -> SDoc Source #