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Glasgow Haskell Compiler
GHC
Commits
74721612
Commit
74721612
authored
Jul 08, 2007
by
Ian Lynagh
Browse files
Implement -XFunctionalDependencies
parent
c71662b2
Changes
2
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compiler/main/DynFlags.hs
View file @
74721612
...
...
@@ -184,6 +184,7 @@ data DynFlag
|
Opt_GADTs
|
Opt_RelaxedPolyRec
-- -X=RelaxedPolyRec
|
Opt_MultiParamTypeClasses
|
Opt_FunctionalDependencies
|
Opt_MagicHash
|
Opt_EmptyDataDecls
|
Opt_KindSignatures
...
...
@@ -1133,6 +1134,7 @@ xFlags = [
(
"ImplicitParams"
,
Opt_ImplicitParams
),
(
"ScopedTypeVariables"
,
Opt_ScopedTypeVariables
),
(
"MultiParamTypeClasses"
,
Opt_MultiParamTypeClasses
),
(
"FunctionalDependencies"
,
Opt_FunctionalDependencies
),
(
"GeneralizedNewtypeDeriving"
,
Opt_GeneralizedNewtypeDeriving
),
(
"AllowOverlappingInstances"
,
Opt_AllowOverlappingInstances
),
(
"AllowUndecidableInstances"
,
Opt_AllowUndecidableInstances
),
...
...
@@ -1150,6 +1152,7 @@ glasgowExtsFlags = [ Opt_GlasgowExts
,
Opt_ImplicitParams
,
Opt_ScopedTypeVariables
,
Opt_MultiParamTypeClasses
,
Opt_FunctionalDependencies
,
Opt_MagicHash
,
Opt_RecursiveDo
,
Opt_ParallelListComp
...
...
compiler/typecheck/TcTyClsDecls.lhs
View file @
74721612
...
...
@@ -1061,10 +1061,12 @@ checkValidClass cls
= do { -- CHECK ARITY 1 FOR HASKELL 1.4
gla_exts <- doptM Opt_GlasgowExts
; multi_param_type_classes <- doptM Opt_MultiParamTypeClasses
; fundep_classes <- doptM Opt_FunctionalDependencies
-- Check that the class is unary, unless GlaExs
; checkTc (notNull tyvars) (nullaryClassErr cls)
; checkTc (multi_param_type_classes || unary) (classArityErr cls)
; checkTc (fundep_classes || null fundeps) (classFunDepsErr cls)
-- Check the super-classes
; checkValidTheta (ClassSCCtxt (className cls)) theta
...
...
@@ -1078,7 +1080,7 @@ checkValidClass cls
; checkTc (unary || no_generics) (genericMultiParamErr cls)
}
where
(tyvars, theta, _, op_stuff) = classBigSig cls
(tyvars,
fundeps,
theta, _,
_,
op_stuff) = class
Extra
BigSig cls
unary = isSingleton tyvars
no_generics = null [() | (_, GenDefMeth) <- op_stuff]
...
...
@@ -1141,6 +1143,10 @@ classArityErr cls
= vcat [ptext SLIT("Too many parameters for class") <+> quotes (ppr cls),
parens (ptext SLIT("Use -XMultiParamTypeClasses to allow multi-parameter classes"))]
classFunDepsErr cls
= vcat [ptext SLIT("Fundeps in class") <+> quotes (ppr cls),
parens (ptext SLIT("Use -XFunctionalDependencies to allow fundeps"))]
noClassTyVarErr clas op
= sep [ptext SLIT("The class method") <+> quotes (ppr op),
ptext SLIT("mentions none of the type variables of the class") <+>
...
...
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