ghc-8.4.1: The GHC API

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tcHsTypeApp :: LHsWcType GhcRn -> Kind -> TcM Type Source #

Type-check a visible type application

tcImplicitTKBndrsType :: [Name] -> TcM Type -> TcM ([TcTyVar], Type) Source #

Convenient specialization

tcExplicitTKBndrs Source #


:: [LHsTyVarBndr GhcRn] 
-> ([TyVar] -> TcM (a, TyVarSet))

Thing inside returns the set of variables bound in the scope. See Note [Scope-check inferred kinds]

-> TcM (a, TyVarSet)

returns augmented bound vars No cloning: returned TyVars have the same Name as the incoming LHsTyVarBndrs

kcTyClTyVars :: Name -> TcM a -> TcM a Source #

Bring tycon tyvars into scope. This is used during the "kind-checking" pass in TcTyClsDecls. (Never in getInitialKind, never in the "type-checking"/desugaring pass.) Never emits constraints, though the thing_inside might.

tcTyClTyVars :: Name -> ([TyConBinder] -> Kind -> TcM a) -> TcM a Source #

Used for the type variables of a type or class decl on the second full pass (type-checking/desugaring) in TcTyClDecls. This is *not* used in the initial-kind run, nor in the "kind-checking" pass. Accordingly, everything passed to the continuation is fully zonked.

(tcTyClTyVars T [a,b] thing_inside) where T : forall k1 k2 (a:k1 -> *) (b:k1). k2 -> * calls thing_inside with arguments [k1,k2,a,b] [k1:*, k2:*, Anon (k1 -> *), Anon k1] (k2 -> *) having also extended the type environment with bindings for k1,k2,a,b

Never emits constraints.

The LHsTyVarBndrs is always user-written, and the full, generalised kind of the tycon is available in the local env.

tcDataKindSig Source #


:: DataKindCheck

Do we require the result to be *?

-> Kind 
-> TcM ([TyConBinder], Kind) 

kcLHsQTyVars Source #


:: Name

of the thing being checked

-> TyConFlavour

What sort of TyCon is being checked

-> Bool

True = the decl being checked has a CUSK

-> Bool

True = all the hsq_implicit are *kind* vars (will give these kind * if -XNoTypeInType)

-> LHsQTyVars GhcRn 
-> TcM (Kind, r)

The result kind, possibly with other info

-> TcM (TcTyCon, r)

A suitably-kinded TcTyCon

Kind-check a LHsQTyVars. If the decl under consideration has a complete, user-supplied kind signature (CUSK), generalise the result. Used in getInitialKind (for tycon kinds and other kinds) and in kind-checking (but not for tycon kinds, which are checked with tcTyClDecls). See also Note [Complete user-supplied kind signatures] in HsDecls.

This function does not do telescope checking.

tcWildCardBinders :: [Name] -> ([(Name, TcTyVar)] -> TcM a) -> TcM a Source #

tcInferApps Source #


:: TcTyMode 
-> Maybe (VarEnv Kind)

Possibly, kind info (see above)

-> LHsType GhcRn

Function (for printing only)

-> TcType

Function (could be knot-tied)

-> TcKind

Function kind (zonked)

-> [LHsType GhcRn]


-> TcM (TcType, [TcType], TcKind)

(f args, args, result kind)

Apply a type of a given kind to a list of arguments. This instantiates invisible parameters as necessary. Always consumes all the arguments, using matchExpectedFunKind as necessary. This takes an optional VarEnv Kind which maps kind variables to kinds. These kinds should be used to instantiate invisible kind variables; they come from an enclosing class for an associated type/data family.

solveEqualities :: TcM a -> TcM a Source #

Type-check a thing that emits only equality constraints, then solve those constraints. Fails outright if there is trouble.

typeLevelMode :: TcTyMode Source #

kindLevelMode :: TcTyMode Source #

instantiateTyUntilN Source #


:: Maybe (VarEnv Kind)

Possibly, instantiations for vars

-> Int
-> TcType

the type

-> TcKind

its kind

-> TcM (TcType, [TcType], TcKind)

The inst'ed type, new args, final kind

Instantiate a type to have at most n invisible arguments.

funAppCtxt :: (Outputable fun, Outputable arg) => fun -> arg -> Int -> SDoc Source #

Make an appropriate message for an error in a function argument. Used for both expressions and types.