Safe Haskell  None 

Language  Haskell2010 
Synopsis
 data TyCon
 data AlgTyConRhs
 = AbstractTyCon
  DataTyCon { }
  TupleTyCon { }
  SumTyCon {
 data_cons :: [DataCon]
 data_cons_size :: Int
  NewTyCon {
 data_con :: DataCon
 nt_rhs :: Type
 nt_etad_rhs :: ([TyVar], Type)
 nt_co :: CoAxiom Unbranched
 visibleDataCons :: AlgTyConRhs > [DataCon]
 data AlgTyConFlav
 isNoParent :: AlgTyConFlav > Bool
 data FamTyConFlav
 data Role
 data Injectivity
 = NotInjective
  Injective [Bool]
 data RuntimeRepInfo
 = NoRRI
  RuntimeRep ([Type] > [PrimRep])
  VecCount Int
  VecElem PrimElemRep
 data TyConFlavour
 type TyConBinder = TyVarBndr TyVar TyConBndrVis
 data TyConBndrVis
 mkNamedTyConBinder :: ArgFlag > TyVar > TyConBinder
 mkNamedTyConBinders :: ArgFlag > [TyVar] > [TyConBinder]
 mkAnonTyConBinder :: TyVar > TyConBinder
 mkAnonTyConBinders :: [TyVar] > [TyConBinder]
 tyConBinderArgFlag :: TyConBinder > ArgFlag
 tyConBndrVisArgFlag :: TyConBndrVis > ArgFlag
 isNamedTyConBinder :: TyConBinder > Bool
 isVisibleTyConBinder :: TyVarBndr tv TyConBndrVis > Bool
 isInvisibleTyConBinder :: TyVarBndr tv TyConBndrVis > Bool
 tyConFieldLabels :: TyCon > [FieldLabel]
 lookupTyConFieldLabel :: FieldLabelString > TyCon > Maybe FieldLabel
 mkAlgTyCon :: Name > [TyConBinder] > Kind > [Role] > Maybe CType > [PredType] > AlgTyConRhs > AlgTyConFlav > Bool > TyCon
 mkClassTyCon :: Name > [TyConBinder] > [Role] > AlgTyConRhs > Class > Name > TyCon
 mkFunTyCon :: Name > [TyConBinder] > Name > TyCon
 mkPrimTyCon :: Name > [TyConBinder] > Kind > [Role] > TyCon
 mkKindTyCon :: Name > [TyConBinder] > Kind > [Role] > Name > TyCon
 mkLiftedPrimTyCon :: Name > [TyConBinder] > Kind > [Role] > TyCon
 mkTupleTyCon :: Name > [TyConBinder] > Kind > Arity > DataCon > TupleSort > AlgTyConFlav > TyCon
 mkSumTyCon :: Name > [TyConBinder] > Kind > Arity > [TyVar] > [DataCon] > AlgTyConFlav > TyCon
 mkDataTyConRhs :: [DataCon] > AlgTyConRhs
 mkSynonymTyCon :: Name > [TyConBinder] > Kind > [Role] > Type > Bool > Bool > TyCon
 mkFamilyTyCon :: Name > [TyConBinder] > Kind > Maybe Name > FamTyConFlav > Maybe Class > Injectivity > TyCon
 mkPromotedDataCon :: DataCon > Name > TyConRepName > [TyConBinder] > Kind > [Role] > RuntimeRepInfo > TyCon
 mkTcTyCon :: Name > SDoc > [TyConBinder] > Kind > [(Name, TcTyVar)] > TyConFlavour > TyCon
 isAlgTyCon :: TyCon > Bool
 isVanillaAlgTyCon :: TyCon > Bool
 isClassTyCon :: TyCon > Bool
 isFamInstTyCon :: TyCon > Bool
 isFunTyCon :: TyCon > Bool
 isPrimTyCon :: TyCon > Bool
 isTupleTyCon :: TyCon > Bool
 isUnboxedTupleTyCon :: TyCon > Bool
 isBoxedTupleTyCon :: TyCon > Bool
 isUnboxedSumTyCon :: TyCon > Bool
 isPromotedTupleTyCon :: TyCon > Bool
 isTypeSynonymTyCon :: TyCon > Bool
 mightBeUnsaturatedTyCon :: TyCon > Bool
 isPromotedDataCon :: TyCon > Bool
 isPromotedDataCon_maybe :: TyCon > Maybe DataCon
 isKindTyCon :: TyCon > Bool
 isLiftedTypeKindTyConName :: Name > Bool
 isTauTyCon :: TyCon > Bool
 isFamFreeTyCon :: TyCon > Bool
 isDataTyCon :: TyCon > Bool
 isProductTyCon :: TyCon > Bool
 isDataProductTyCon_maybe :: TyCon > Maybe DataCon
 isDataSumTyCon_maybe :: TyCon > Maybe [DataCon]
 isEnumerationTyCon :: TyCon > Bool
 isNewTyCon :: TyCon > Bool
 isAbstractTyCon :: TyCon > Bool
 isFamilyTyCon :: TyCon > Bool
 isOpenFamilyTyCon :: TyCon > Bool
 isTypeFamilyTyCon :: TyCon > Bool
 isDataFamilyTyCon :: TyCon > Bool
 isOpenTypeFamilyTyCon :: TyCon > Bool
 isClosedSynFamilyTyConWithAxiom_maybe :: TyCon > Maybe (CoAxiom Branched)
 tyConInjectivityInfo :: TyCon > Injectivity
 isBuiltInSynFamTyCon_maybe :: TyCon > Maybe BuiltInSynFamily
 isUnliftedTyCon :: TyCon > Bool
 isGadtSyntaxTyCon :: TyCon > Bool
 isInjectiveTyCon :: TyCon > Role > Bool
 isGenerativeTyCon :: TyCon > Role > Bool
 isGenInjAlgRhs :: AlgTyConRhs > Bool
 isTyConAssoc :: TyCon > Bool
 tyConAssoc_maybe :: TyCon > Maybe Class
 isImplicitTyCon :: TyCon > Bool
 isTyConWithSrcDataCons :: TyCon > Bool
 isTcTyCon :: TyCon > Bool
 isTcLevPoly :: TyCon > Bool
 tyConName :: TyCon > Name
 tyConSkolem :: TyCon > Bool
 tyConKind :: TyCon > Kind
 tyConUnique :: TyCon > Unique
 tyConTyVars :: TyCon > [TyVar]
 tyConVisibleTyVars :: TyCon > [TyVar]
 tyConCType :: TyCon > Maybe CType
 tyConCType_maybe :: TyCon > Maybe CType
 tyConDataCons :: TyCon > [DataCon]
 tyConDataCons_maybe :: TyCon > Maybe [DataCon]
 tyConSingleDataCon_maybe :: TyCon > Maybe DataCon
 tyConSingleDataCon :: TyCon > DataCon
 tyConSingleAlgDataCon_maybe :: TyCon > Maybe DataCon
 tyConFamilySize :: TyCon > Int
 tyConStupidTheta :: TyCon > [PredType]
 tyConArity :: TyCon > Arity
 tyConRoles :: TyCon > [Role]
 tyConFlavour :: TyCon > TyConFlavour
 tyConTuple_maybe :: TyCon > Maybe TupleSort
 tyConClass_maybe :: TyCon > Maybe Class
 tyConATs :: TyCon > [TyCon]
 tyConFamInst_maybe :: TyCon > Maybe (TyCon, [Type])
 tyConFamInstSig_maybe :: TyCon > Maybe (TyCon, [Type], CoAxiom Unbranched)
 tyConFamilyCoercion_maybe :: TyCon > Maybe (CoAxiom Unbranched)
 tyConFamilyResVar_maybe :: TyCon > Maybe Name
 synTyConDefn_maybe :: TyCon > Maybe ([TyVar], Type)
 synTyConRhs_maybe :: TyCon > Maybe Type
 famTyConFlav_maybe :: TyCon > Maybe FamTyConFlav
 famTcResVar :: TyCon > Maybe Name
 algTyConRhs :: TyCon > AlgTyConRhs
 newTyConRhs :: TyCon > ([TyVar], Type)
 newTyConEtadArity :: TyCon > Int
 newTyConEtadRhs :: TyCon > ([TyVar], Type)
 unwrapNewTyCon_maybe :: TyCon > Maybe ([TyVar], Type, CoAxiom Unbranched)
 unwrapNewTyConEtad_maybe :: TyCon > Maybe ([TyVar], Type, CoAxiom Unbranched)
 newTyConDataCon_maybe :: TyCon > Maybe DataCon
 algTcFields :: TyCon > FieldLabelEnv
 tyConRuntimeRepInfo :: TyCon > RuntimeRepInfo
 tyConBinders :: TyCon > [TyConBinder]
 tyConResKind :: TyCon > Kind
 tyConTyVarBinders :: [TyConBinder] > [TyVarBinder]
 tcTyConScopedTyVars :: TyCon > [(Name, TyVar)]
 tcTyConUserTyVars :: TyCon > SDoc
 mkTyConTagMap :: TyCon > NameEnv ConTag
 expandSynTyCon_maybe :: TyCon > [tyco] > Maybe ([(TyVar, tyco)], Type, [tyco])
 makeRecoveryTyCon :: TyCon > TyCon
 newTyConCo :: TyCon > CoAxiom Unbranched
 newTyConCo_maybe :: TyCon > Maybe (CoAxiom Unbranched)
 pprPromotionQuote :: TyCon > SDoc
 mkTyConKind :: [TyConBinder] > Kind > Kind
 tcFlavourCanBeUnsaturated :: TyConFlavour > Bool
 tcFlavourIsOpen :: TyConFlavour > Bool
 type TyConRepName = Name
 tyConRepName_maybe :: TyCon > Maybe TyConRepName
 mkPrelTyConRepName :: Name > TyConRepName
 tyConRepModOcc :: Module > OccName > (Module, OccName)
 data PrimRep
 data PrimElemRep
 isVoidRep :: PrimRep > Bool
 isGcPtrRep :: PrimRep > Bool
 primRepSizeB :: DynFlags > PrimRep > Int
 primElemRepSizeB :: PrimElemRep > Int
 primRepIsFloat :: PrimRep > Maybe Bool
 data RecTcChecker
 initRecTc :: RecTcChecker
 checkRecTc :: RecTcChecker > TyCon > Maybe RecTcChecker
Main TyCon data types
TyCons represent type constructors. Type constructors are introduced by things such as:
1) Data declarations: data Foo = ...
creates the Foo
type constructor of
kind *
2) Type synonyms: type Foo = ...
creates the Foo
type constructor
3) Newtypes: newtype Foo a = MkFoo ...
creates the Foo
type constructor
of kind * > *
4) Class declarations: class Foo where
creates the Foo
type constructor
of kind *
This data type also encodes a number of primitive, built in type constructors such as those for function and tuple types.
Instances
Eq TyCon #  
Data TyCon #  
Defined in TyCon gfoldl :: (forall d b. Data d => c (d > b) > d > c b) > (forall g. g > c g) > TyCon > c TyCon Source # gunfold :: (forall b r. Data b => c (b > r) > c r) > (forall r. r > c r) > Constr > c TyCon Source # toConstr :: TyCon > Constr Source # dataTypeOf :: TyCon > DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) > Maybe (c TyCon) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) > Maybe (c TyCon) Source # gmapT :: (forall b. Data b => b > b) > TyCon > TyCon Source # gmapQl :: (r > r' > r) > r > (forall d. Data d => d > r') > TyCon > r Source # gmapQr :: (r' > r > r) > r > (forall d. Data d => d > r') > TyCon > r Source # gmapQ :: (forall d. Data d => d > u) > TyCon > [u] Source # gmapQi :: Int > (forall d. Data d => d > u) > TyCon > u Source # gmapM :: Monad m => (forall d. Data d => d > m d) > TyCon > m TyCon Source # gmapMp :: MonadPlus m => (forall d. Data d => d > m d) > TyCon > m TyCon Source # gmapMo :: MonadPlus m => (forall d. Data d => d > m d) > TyCon > m TyCon Source #  
Outputable TyCon #  
Uniquable TyCon #  
NamedThing TyCon #  
data AlgTyConRhs Source #
Represents righthandsides of TyCon
s for algebraic types
AbstractTyCon  Says that we know nothing about this data type, except that it's represented by a pointer. Used when we export a data type abstractly into an .hi file. 
DataTyCon  Information about those 
 
TupleTyCon  
SumTyCon  An unboxed sum type. 
 
NewTyCon  Information about those 

visibleDataCons :: AlgTyConRhs > [DataCon] Source #
Both type classes as well as family instances imply implicit type constructors. These implicit type constructors refer to their parent structure (ie, the class or family from which they derive) using a type of the following form.
Extract those DataCon
s that we are able to learn about. Note
that visibility in this sense does not correspond to visibility in
the context of any particular user program!
data AlgTyConFlav Source #
VanillaAlgTyCon TyConRepName  An ordinary type constructor has no parent. 
UnboxedAlgTyCon (Maybe TyConRepName)  An unboxed type constructor. The TyConRepName is a Maybe since we currently don't allow unboxed sums to be Typeable since there are too many of them. See #13276. 
ClassTyCon Class TyConRepName  Type constructors representing a class dictionary. See Note [ATyCon for classes] in TyCoRep 
DataFamInstTyCon (CoAxiom Unbranched) TyCon [Type]  Type constructors representing an *instance* of a *data* family. Parameters: 1) The type family in question 2) Instance types; free variables are the 3) A 
Instances
Outputable AlgTyConFlav #  
isNoParent :: AlgTyConFlav > Bool Source #
data FamTyConFlav Source #
Information pertaining to the expansion of a type synonym (type
)
DataFamilyTyCon TyConRepName  Represents an open type family without a fixed right hand side. Additional instances can appear at any time. These are introduced by either a top level declaration: data family T a :: * Or an associated data type declaration, within a class declaration: class C a b where data T b :: * 
OpenSynFamilyTyCon  An open type synonym family e.g. 
ClosedSynFamilyTyCon (Maybe (CoAxiom Branched))  A closed type synonym family e.g.

AbstractClosedSynFamilyTyCon  A closed type synonym family declared in an hsboot file with type family F a where .. 
BuiltInSynFamTyCon BuiltInSynFamily  Builtin type family used by the TypeNats solver 
Instances
Outputable FamTyConFlav #  
Instances
Eq Role #  
Data Role #  
Defined in CoAxiom gfoldl :: (forall d b. Data d => c (d > b) > d > c b) > (forall g. g > c g) > Role > c Role Source # gunfold :: (forall b r. Data b => c (b > r) > c r) > (forall r. r > c r) > Constr > c Role Source # toConstr :: Role > Constr Source # dataTypeOf :: Role > DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) > Maybe (c Role) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) > Maybe (c Role) Source # gmapT :: (forall b. Data b => b > b) > Role > Role Source # gmapQl :: (r > r' > r) > r > (forall d. Data d => d > r') > Role > r Source # gmapQr :: (r' > r > r) > r > (forall d. Data d => d > r') > Role > r Source # gmapQ :: (forall d. Data d => d > u) > Role > [u] Source # gmapQi :: Int > (forall d. Data d => d > u) > Role > u Source # gmapM :: Monad m => (forall d. Data d => d > m d) > Role > m Role Source # gmapMp :: MonadPlus m => (forall d. Data d => d > m d) > Role > m Role Source # gmapMo :: MonadPlus m => (forall d. Data d => d > m d) > Role > m Role Source #  
Ord Role #  
Outputable Role #  
Binary Role #  
data Injectivity Source #
Instances
Eq Injectivity #  
Defined in TyCon (==) :: Injectivity > Injectivity > Bool # (/=) :: Injectivity > Injectivity > Bool #  
Binary Injectivity #  
data RuntimeRepInfo Source #
Some promoted datacons signify extra info relevant to GHC. For example,
the IntRep
constructor of RuntimeRep
corresponds to the IntRep
constructor of PrimRep
. This data structure allows us to store this
information right in the TyCon
. The other approach would be to look
up things like RuntimeRep
's PrimRep
by knownkey every time.
NoRRI  an ordinary promoted data con 
RuntimeRep ([Type] > [PrimRep])  A constructor of 
VecCount Int  A constructor of 
VecElem PrimElemRep  A constructor of 
data TyConFlavour Source #
Paints a picture of what a TyCon
represents, in broad strokes.
This is used towards more informative error messages.
Instances
Eq TyConFlavour #  
Defined in TyCon (==) :: TyConFlavour > TyConFlavour > Bool # (/=) :: TyConFlavour > TyConFlavour > Bool #  
Outputable TyConFlavour #  
TyConBinder
type TyConBinder = TyVarBndr TyVar TyConBndrVis Source #
data TyConBndrVis Source #
Instances
Outputable TyConBndrVis #  
Binary TyConBndrVis #  
Outputable tv => Outputable (TyVarBndr tv TyConBndrVis) #  
mkNamedTyConBinder :: ArgFlag > TyVar > TyConBinder Source #
mkNamedTyConBinders :: ArgFlag > [TyVar] > [TyConBinder] Source #
mkAnonTyConBinder :: TyVar > TyConBinder Source #
mkAnonTyConBinders :: [TyVar] > [TyConBinder] Source #
isNamedTyConBinder :: TyConBinder > Bool Source #
isVisibleTyConBinder :: TyVarBndr tv TyConBndrVis > Bool Source #
isInvisibleTyConBinder :: TyVarBndr tv TyConBndrVis > Bool Source #
Field labels
tyConFieldLabels :: TyCon > [FieldLabel] Source #
The labels for the fields of this particular TyCon
lookupTyConFieldLabel :: FieldLabelString > TyCon > Maybe FieldLabel Source #
Look up a field label belonging to this TyCon
Constructing TyCons
:: Name  
> [TyConBinder]  Binders of the 
> Kind  Result kind 
> [Role]  The roles for each TyVar 
> Maybe CType  The C type this type corresponds to when using the CAPI FFI 
> [PredType]  Stupid theta: see 
> AlgTyConRhs  Information about data constructors 
> AlgTyConFlav  What flavour is it? (e.g. vanilla, type family) 
> Bool  Was the 
> TyCon 
This is the making of an algebraic TyCon
. Notably, you have to
pass in the generic (in the XGenerics sense) information about the
type constructor  you can get hold of it easily (see Generics
module)
mkClassTyCon :: Name > [TyConBinder] > [Role] > AlgTyConRhs > Class > Name > TyCon Source #
Simpler specialization of mkAlgTyCon
for classes
mkFunTyCon :: Name > [TyConBinder] > Name > TyCon Source #
:: Name  
> [TyConBinder]  
> Kind  result kind, never levitypolymorphic 
> [Role]  
> TyCon 
Create an unlifted primitive TyCon
, such as Int#
.
Kind constructors
:: Name  
> [TyConBinder]  
> Kind  result kind 
> [Role]  
> TyCon 
Create a lifted primitive TyCon
such as RealWorld
:: Name  
> [TyConBinder]  
> Kind  Result kind of the 
> Arity  Arity of the tuple 
> DataCon  
> TupleSort  Whether the tuple is boxed or unboxed 
> AlgTyConFlav  
> TyCon 
:: Name  
> [TyConBinder]  
> Kind  Kind of the resulting 
> Arity  Arity of the sum 
> [TyVar] 

> [DataCon]  
> AlgTyConFlav  
> TyCon 
mkDataTyConRhs :: [DataCon] > AlgTyConRhs Source #
Create a type synonym TyCon
:: Name  
> [TyConBinder]  
> Kind  result kind 
> Maybe Name  
> FamTyConFlav  
> Maybe Class  
> Injectivity  
> TyCon 
Create a type family TyCon
mkPromotedDataCon :: DataCon > Name > TyConRepName > [TyConBinder] > Kind > [Role] > RuntimeRepInfo > TyCon Source #
Create a promoted data constructor TyCon
Somewhat dodgily, we give it the same Name
as the data constructor itself; when we prettyprint
the TyCon we add a quote; see the Outputable TyCon instance
:: Name  
> SDoc  userwritten tycon tyvars 
> [TyConBinder]  
> Kind  result kind only 
> [(Name, TcTyVar)]  Scoped type variables; see Note [How TcTyCons work] in TcTyClsDecls 
> TyConFlavour  What sort of 
> TyCon 
Makes a tycon suitable for use during typechecking. It stores a variety of details about the definition of the TyCon, but no righthand side. It lives only during the typechecking of a mutuallyrecursive group of tycons; it is then zonked to a proper TyCon in zonkTcTyCon. See also Note [Kind checking recursive type and class declarations] in TcTyClsDecls.
Predicates on TyCons
isAlgTyCon :: TyCon > Bool Source #
Returns True
if the supplied TyCon
resulted from either a
data
or newtype
declaration
isVanillaAlgTyCon :: TyCon > Bool Source #
Returns True
for vanilla AlgTyCons  that is, those created
with a data
or newtype
declaration.
isFunTyCon :: TyCon > Bool Source #
isPrimTyCon :: TyCon > Bool Source #
Does this TyCon
represent something that cannot be defined in Haskell?
isTupleTyCon :: TyCon > Bool Source #
Does this TyCon
represent a tuple?
NB: when compiling Data.Tuple
, the tycons won't reply True
to
isTupleTyCon
, because they are built as AlgTyCons
. However they
get spat into the interface file as tuple tycons, so I don't think
it matters.
isTypeSynonymTyCon :: TyCon > Bool Source #
Is this a TyCon
representing a regular H98 type synonym (type
)?
mightBeUnsaturatedTyCon :: TyCon > Bool Source #
True iff we can decompose (T a b c) into ((T a b) c) I.e. is it injective and generative w.r.t nominal equality? That is, if (T a b) ~N d e f, is it always the case that (T ~N d), (a ~N e) and (b ~N f)? Specifically NOT true of synonyms (open and otherwise)
It'd be unusual to call mightBeUnsaturatedTyCon on a regular H98 type synonym, because you should probably have expanded it first But regardless, it's not decomposable
isPromotedDataCon :: TyCon > Bool Source #
Is this a PromotedDataCon?
isPromotedDataCon_maybe :: TyCon > Maybe DataCon Source #
Retrieves the promoted DataCon if this is a PromotedDataCon;
isKindTyCon :: TyCon > Bool Source #
Is this tycon really meant for use at the kind level? That is, should it be permitted without XDataKinds?
isLiftedTypeKindTyConName :: Name > Bool Source #
isTauTyCon :: TyCon > Bool Source #
isFamFreeTyCon :: TyCon > Bool Source #
isDataTyCon :: TyCon > Bool Source #
Returns True
for data types that are definitely represented by
heapallocated constructors. These are scrutinised by Corelevel
case
expressions, and they get info tables allocated for them.
Generally, the function will be true for all data
types and false
for newtype
s, unboxed tuples, unboxed sums and type family
TyCon
s. But it is not guaranteed to return True
in all cases
that it could.
NB: for a data type family, only the instance TyCon
s
get an info table. The family declaration TyCon
does not
isProductTyCon :: TyCon > Bool Source #
isEnumerationTyCon :: TyCon > Bool Source #
Is this an algebraic TyCon
which is just an enumeration of values?
isAbstractTyCon :: TyCon > Bool Source #
Test if the TyCon
is algebraic but abstract (invisible data constructors)
isFamilyTyCon :: TyCon > Bool Source #
Is this a TyCon
, synonym or otherwise, that defines a family?
isOpenFamilyTyCon :: TyCon > Bool Source #
Is this a TyCon
, synonym or otherwise, that defines a family with
instances?
isTypeFamilyTyCon :: TyCon > Bool Source #
Is this a synonym TyCon
that can have may have further instances appear?
isDataFamilyTyCon :: TyCon > Bool Source #
Is this a synonym TyCon
that can have may have further instances appear?
isOpenTypeFamilyTyCon :: TyCon > Bool Source #
Is this an open type family TyCon?
isClosedSynFamilyTyConWithAxiom_maybe :: TyCon > Maybe (CoAxiom Branched) Source #
Is this a nonempty closed type family? Returns Nothing
for
abstract or empty closed families.
tyConInjectivityInfo :: TyCon > Injectivity Source #
returns tyConInjectivityInfo
tc
is Injective
istc
is an
injective tycon (where is
states for which tyConBinders
tc
is
injective), or NotInjective
otherwise.
isUnliftedTyCon :: TyCon > Bool Source #
isGadtSyntaxTyCon :: TyCon > Bool Source #
Is this an algebraic TyCon
declared with the GADT syntax?
isInjectiveTyCon :: TyCon > Role > Bool Source #
isInjectiveTyCon
is true of TyCon
s for which this property holds
(where X is the role passed in):
If (T a1 b1 c1) ~X (T a2 b2 c2), then (a1 ~X1 a2), (b1 ~X2 b2), and (c1 ~X3 c2)
(where X1, X2, and X3, are the roles given by tyConRolesX tc X)
See also Note [Decomposing equality] in TcCanonical
isGenerativeTyCon :: TyCon > Role > Bool Source #
isGenerativeTyCon
is true of TyCon
s for which this property holds
(where X is the role passed in):
If (T tys ~X t), then (t's head ~X T).
See also Note [Decomposing equality] in TcCanonical
isGenInjAlgRhs :: AlgTyConRhs > Bool Source #
Is this an AlgTyConRhs
of a TyCon
that is generative and injective
with respect to representational equality?
isTyConAssoc :: TyCon > Bool Source #
isImplicitTyCon :: TyCon > Bool Source #
Identifies implicit tycons that, in particular, do not go into interface files (because they are implicitly reconstructed when the interface is read).
Note that:
 Associated families are implicit, as they are reconstructed from the class declaration in which they reside, and
 Family instances are not implicit as they represent the instance body
(similar to a
dfun
does that for a class instance).  Tuples are implicit iff they have a wiredin name (namely: boxed and unboxed tupeles are wiredin and implicit, but constraint tuples are not)
isTyConWithSrcDataCons :: TyCon > Bool Source #
Check if the tycon actually refers to a proper `data` or `newtype` with user defined constructors rather than one from a class or other construction.
isTcTyCon :: TyCon > Bool Source #
Is this a TcTyCon? (That is, one only used during typechecking?)
isTcLevPoly :: TyCon > Bool Source #
Could this TyCon ever be levitypolymorphic when fully applied? True is safe. False means we're sure. Does only a quick check based on the TyCon's category. Precondition: The fullyapplied TyCon has kind (TYPE blah)
Extracting information out of TyCons
tyConSkolem :: TyCon > Bool Source #
Returns whether or not this TyCon
is definite, or a hole
that may be filled in at some later point. See Note [Skolem abstract data]
tyConUnique :: TyCon > Unique Source #
A Unique of this TyCon. Invariant: identical to Unique of Name stored in tyConName field.
tyConTyVars :: TyCon > [TyVar] Source #
TyVar binders
tyConVisibleTyVars :: TyCon > [TyVar] Source #
tyConCType :: TyCon > Maybe CType Source #
The C type that should be used for this type when using the FFI and CAPI
tyConDataCons :: TyCon > [DataCon] Source #
As tyConDataCons_maybe
, but returns the empty list of constructors if no
constructors could be found
tyConSingleDataCon_maybe :: TyCon > Maybe DataCon Source #
If the given TyCon
has a single data constructor, i.e. it is a data
type with one alternative, a tuple type or a newtype
then that constructor
is returned. If the TyCon
has more than one constructor, or represents a
primitive or function type constructor then Nothing
is returned. In any
other case, the function panics
tyConSingleDataCon :: TyCon > DataCon Source #
tyConFamilySize :: TyCon > Int Source #
tyConStupidTheta :: TyCon > [PredType] Source #
Find the "stupid theta" of the TyCon
. A "stupid theta" is the context
to the left of an algebraic type declaration, e.g. Eq a
in the declaration
data Eq a => T a ...
tyConArity :: TyCon > Arity Source #
Arity
tyConRoles :: TyCon > [Role] Source #
Get the list of roles for the type parameters of a TyCon
tyConFlavour :: TyCon > TyConFlavour Source #
tyConClass_maybe :: TyCon > Maybe Class Source #
If this TyCon
is that for a class instance, return the class it is for.
Otherwise returns Nothing
tyConFamInst_maybe :: TyCon > Maybe (TyCon, [Type]) Source #
If this TyCon
is that of a data family instance, return the family in question
and the instance types. Otherwise, return Nothing
tyConFamInstSig_maybe :: TyCon > Maybe (TyCon, [Type], CoAxiom Unbranched) Source #
tyConFamilyResVar_maybe :: TyCon > Maybe Name Source #
Extract type variable naming the result of injective type family
synTyConDefn_maybe :: TyCon > Maybe ([TyVar], Type) Source #
Extract the TyVar
s bound by a vanilla type synonym
and the corresponding (unsubstituted) right hand side.
synTyConRhs_maybe :: TyCon > Maybe Type Source #
Extract the information pertaining to the right hand side of a type synonym
(type
) declaration.
famTyConFlav_maybe :: TyCon > Maybe FamTyConFlav Source #
Extract the flavour of a type family (with all the extra information that it carries)
famTcResVar :: TyCon > Maybe Name Source #
Name of result type variable, used for prettyprinting with showiface and for reifying TyCon in Template Haskell
algTyConRhs :: TyCon > AlgTyConRhs Source #
Extract an AlgTyConRhs
with information about data constructors from an
algebraic or tuple TyCon
. Panics for any other sort of TyCon
newTyConEtadArity :: TyCon > Int Source #
The number of type parameters that need to be passed to a newtype to resolve it. May be less than in the definition if it can be etacontracted.
unwrapNewTyCon_maybe :: TyCon > Maybe ([TyVar], Type, CoAxiom Unbranched) Source #
unwrapNewTyConEtad_maybe :: TyCon > Maybe ([TyVar], Type, CoAxiom Unbranched) Source #
algTcFields :: TyCon > FieldLabelEnv Source #
Maps a label to information about the field
tyConRuntimeRepInfo :: TyCon > RuntimeRepInfo Source #
Extract any RuntimeRepInfo
from this TyCon
tyConBinders :: TyCon > [TyConBinder] Source #
Full binders
tyConResKind :: TyCon > Kind Source #
Result kind
tyConTyVarBinders :: [TyConBinder] > [TyVarBinder] Source #
tcTyConScopedTyVars :: TyCon > [(Name, TyVar)] Source #
Scoped tyvars over the tycon's body See Note [How TcTyCons work] in TcTyClsDecls Order does *not* matter.
tcTyConUserTyVars :: TyCon > SDoc Source #
Original, userwritten tycon tyvars
Manipulating TyCons
:: TyCon  
> [tyco]  Arguments to 
> Maybe ([(TyVar, tyco)], Type, [tyco])  Returns a 
Expand a type synonym application, if any
makeRecoveryTyCon :: TyCon > TyCon Source #
Make a fake, recovery TyCon
from an existing one.
Used when recovering from errors
newTyConCo :: TyCon > CoAxiom Unbranched Source #
newTyConCo_maybe :: TyCon > Maybe (CoAxiom Unbranched) Source #
pprPromotionQuote :: TyCon > SDoc Source #
mkTyConKind :: [TyConBinder] > Kind > Kind Source #
Predicated on TyConFlavours
tcFlavourCanBeUnsaturated :: TyConFlavour > Bool Source #
Can this flavour of TyCon
appear unsaturated?
tcFlavourIsOpen :: TyConFlavour > Bool Source #
Is this flavour of TyCon
an open type family or a data family?
Runtime type representation
type TyConRepName = Name Source #
mkPrelTyConRepName :: Name > TyConRepName Source #
Make a Name
for the Typeable
representation of the given wiredin type
tyConRepModOcc :: Module > OccName > (Module, OccName) Source #
The name (and defining module) for the Typeable representation (TyCon) of a type constructor.
See Note [Grand plan for Typeable] in TcTypeable
in TcTypeable.
Primitive representations of Types
A PrimRep
is an abstraction of a type. It contains information that
the code generator needs in order to pass arguments, return results,
and store values of this type.
VoidRep  
LiftedRep  
UnliftedRep  Unlifted pointer 
IntRep  Signed, wordsized value 
WordRep  Unsigned, wordsized value 
Int64Rep  Signed, 64 bit value (with 32bit words only) 
Word64Rep  Unsigned, 64 bit value (with 32bit words only) 
AddrRep  A pointer, but not to a Haskell value (use '(Un)liftedRep') 
FloatRep  
DoubleRep  
VecRep Int PrimElemRep  A vector 
data PrimElemRep Source #
Int8ElemRep  
Int16ElemRep  
Int32ElemRep  
Int64ElemRep  
Word8ElemRep  
Word16ElemRep  
Word32ElemRep  
Word64ElemRep  
FloatElemRep  
DoubleElemRep 
Instances
Eq PrimElemRep #  
Defined in TyCon (==) :: PrimElemRep > PrimElemRep > Bool # (/=) :: PrimElemRep > PrimElemRep > Bool #  
Show PrimElemRep #  
Outputable PrimElemRep #  
isGcPtrRep :: PrimRep > Bool Source #
primRepSizeB :: DynFlags > PrimRep > Int Source #
The size of a PrimRep
in bytes.
This applies also when used in a constructor, where we allow packing the
fields. For instance, in data Foo = Foo Float
the two fields will
take only 8 bytes, which for 64bit arch will be equal to 1 word.
See also mkVirtHeapOffsetsWithPadding for details of how data fields are
layed out.
primElemRepSizeB :: PrimElemRep > Int Source #
primRepIsFloat :: PrimRep > Maybe Bool Source #
Return if Rep stands for floating type, returns Nothing for vector types.
Recursion breaking
data RecTcChecker Source #
checkRecTc :: RecTcChecker > TyCon > Maybe RecTcChecker Source #