Safe Haskell	None
Language	Haskell2010

GHC.Types.Unique.FM

Contents

Unique-keyed mappings
- Manipulating those mappings

Synopsis

data UniqFM key ele
newtype NonDetUniqFM key ele = NonDetUniqFM {
- getNonDet :: UniqFM key ele
}
emptyUFM :: UniqFM key elt
unitUFM :: Uniquable key => key -> elt -> UniqFM key elt
unitDirectlyUFM :: Unique -> elt -> UniqFM key elt
zipToUFM :: Uniquable key => [key] -> [elt] -> UniqFM key elt
listToUFM :: Uniquable key => [(key, elt)] -> UniqFM key elt
listToUFM_Directly :: [(Unique, elt)] -> UniqFM key elt
listToUFM_C :: Uniquable key => (elt -> elt -> elt) -> [(key, elt)] -> UniqFM key elt
listToIdentityUFM :: Uniquable key => [key] -> UniqFM key key
addToUFM :: Uniquable key => UniqFM key elt -> key -> elt -> UniqFM key elt
addToUFM_C :: Uniquable key => (elt -> elt -> elt) -> UniqFM key elt -> key -> elt -> UniqFM key elt
addToUFM_Acc :: Uniquable key => (elt -> elts -> elts) -> (elt -> elts) -> UniqFM key elts -> key -> elt -> UniqFM key elts
addToUFM_L :: Uniquable key => (key -> elt -> elt -> elt) -> key -> elt -> UniqFM key elt -> (Maybe elt, UniqFM key elt)
addListToUFM :: Uniquable key => UniqFM key elt -> [(key, elt)] -> UniqFM key elt
addListToUFM_C :: Uniquable key => (elt -> elt -> elt) -> UniqFM key elt -> [(key, elt)] -> UniqFM key elt
addToUFM_Directly :: UniqFM key elt -> Unique -> elt -> UniqFM key elt
addListToUFM_Directly :: UniqFM key elt -> [(Unique, elt)] -> UniqFM key elt
adjustUFM :: Uniquable key => (elt -> elt) -> UniqFM key elt -> key -> UniqFM key elt
alterUFM :: Uniquable key => (Maybe elt -> Maybe elt) -> UniqFM key elt -> key -> UniqFM key elt
alterUFM_Directly :: (Maybe elt -> Maybe elt) -> UniqFM key elt -> Unique -> UniqFM key elt
adjustUFM_Directly :: (elt -> elt) -> UniqFM key elt -> Unique -> UniqFM key elt
delFromUFM :: Uniquable key => UniqFM key elt -> key -> UniqFM key elt
delFromUFM_Directly :: UniqFM key elt -> Unique -> UniqFM key elt
delListFromUFM :: Uniquable key => UniqFM key elt -> [key] -> UniqFM key elt
delListFromUFM_Directly :: UniqFM key elt -> [Unique] -> UniqFM key elt
plusUFM :: UniqFM key elt -> UniqFM key elt -> UniqFM key elt
plusUFM_C :: (elt -> elt -> elt) -> UniqFM key elt -> UniqFM key elt -> UniqFM key elt
plusUFM_CD :: (elta -> eltb -> eltc) -> UniqFM key elta -> elta -> UniqFM key eltb -> eltb -> UniqFM key eltc
plusUFM_CD2 :: (Maybe elta -> Maybe eltb -> eltc) -> UniqFM key elta -> UniqFM key eltb -> UniqFM key eltc
mergeUFM :: (elta -> eltb -> Maybe eltc) -> (UniqFM key elta -> UniqFM key eltc) -> (UniqFM key eltb -> UniqFM key eltc) -> UniqFM key elta -> UniqFM key eltb -> UniqFM key eltc
plusMaybeUFM_C :: (elt -> elt -> Maybe elt) -> UniqFM key elt -> UniqFM key elt -> UniqFM key elt
plusUFMList :: [UniqFM key elt] -> UniqFM key elt
plusUFMListWith :: (elt -> elt -> elt) -> [UniqFM key elt] -> UniqFM key elt
sequenceUFMList :: [UniqFM key elt] -> UniqFM key [elt]
minusUFM :: UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1
minusUFM_C :: (elt1 -> elt2 -> Maybe elt1) -> UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1
intersectUFM :: UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1
intersectUFM_C :: (elt1 -> elt2 -> elt3) -> UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt3
disjointUFM :: UniqFM key elt1 -> UniqFM key elt2 -> Bool
equalKeysUFM :: UniqFM key a -> UniqFM key b -> Bool
nonDetStrictFoldUFM :: (elt -> a -> a) -> a -> UniqFM key elt -> a
nonDetFoldUFM :: (elt -> a -> a) -> a -> UniqFM key elt -> a
nonDetStrictFoldUFM_DirectlyM :: Monad m => (Unique -> b -> elt -> m b) -> b -> UniqFM key elt -> m b
nonDetFoldWithKeyUFM :: (Unique -> elt -> a -> a) -> a -> UniqFM key elt -> a
nonDetStrictFoldUFM_Directly :: (Unique -> elt -> a -> a) -> a -> UniqFM key elt -> a
anyUFM :: (elt -> Bool) -> UniqFM key elt -> Bool
allUFM :: (elt -> Bool) -> UniqFM key elt -> Bool
seqEltsUFM :: (elt -> ()) -> UniqFM key elt -> ()
mapUFM :: (elt1 -> elt2) -> UniqFM key elt1 -> UniqFM key elt2
mapUFM_Directly :: (Unique -> elt1 -> elt2) -> UniqFM key elt1 -> UniqFM key elt2
strictMapUFM :: (a -> b) -> UniqFM k a -> UniqFM k b
mapMaybeUFM :: (elt1 -> Maybe elt2) -> UniqFM key elt1 -> UniqFM key elt2
mapMaybeWithKeyUFM :: (Unique -> elt1 -> Maybe elt2) -> UniqFM key elt1 -> UniqFM key elt2
elemUFM :: Uniquable key => key -> UniqFM key elt -> Bool
elemUFM_Directly :: Unique -> UniqFM key elt -> Bool
filterUFM :: (elt -> Bool) -> UniqFM key elt -> UniqFM key elt
filterUFM_Directly :: (Unique -> elt -> Bool) -> UniqFM key elt -> UniqFM key elt
partitionUFM :: (elt -> Bool) -> UniqFM key elt -> (UniqFM key elt, UniqFM key elt)
sizeUFM :: UniqFM key elt -> Int
isNullUFM :: UniqFM key elt -> Bool
lookupUFM :: Uniquable key => UniqFM key elt -> key -> Maybe elt
lookupUFM_Directly :: UniqFM key elt -> Unique -> Maybe elt
lookupWithDefaultUFM :: Uniquable key => UniqFM key elt -> elt -> key -> elt
lookupWithDefaultUFM_Directly :: UniqFM key elt -> elt -> Unique -> elt
nonDetEltsUFM :: UniqFM key elt -> [elt]
nonDetKeysUFM :: UniqFM key elt -> [Unique]
ufmToSet_Directly :: UniqFM key elt -> Word64Set
nonDetUFMToList :: UniqFM key elt -> [(Unique, elt)]
ufmToIntMap :: UniqFM key elt -> Word64Map elt
unsafeIntMapToUFM :: Word64Map elt -> UniqFM key elt
unsafeCastUFMKey :: UniqFM key1 elt -> UniqFM key2 elt
pprUniqFM :: (a -> SDoc) -> UniqFM key a -> SDoc
pprUFM :: UniqFM key a -> ([a] -> SDoc) -> SDoc
pprUFMWithKeys :: UniqFM key a -> ([(Unique, a)] -> SDoc) -> SDoc
pluralUFM :: UniqFM key a -> SDoc

Unique-keyed mappings

data UniqFM key ele Source #

A finite map from uniques of one type to elements in another type.

The key is just here to keep us honest. It's always safe to use a single type as key. If two types don't overlap in their uniques it's also safe to index the same map at multiple key types. But this is very much discouraged.

Instances

Instances details

Functor (UniqFM key) Source #
Instance details Defined in GHC.Types.Unique.FM Methods fmap :: (a -> b) -> UniqFM key a -> UniqFM key b Source # (<$) :: a -> UniqFM key b -> UniqFM key a Source #
(Data key, Data ele) => Data (UniqFM key ele) Source #
Instance details Defined in GHC.Types.Unique.FM Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> UniqFM key ele -> c (UniqFM key ele) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (UniqFM key ele) Source # toConstr :: UniqFM key ele -> Constr Source # dataTypeOf :: UniqFM key ele -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (UniqFM key ele)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (UniqFM key ele)) Source # gmapT :: (forall b. Data b => b -> b) -> UniqFM key ele -> UniqFM key ele Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> UniqFM key ele -> r Source # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> UniqFM key ele -> r Source # gmapQ :: (forall d. Data d => d -> u) -> UniqFM key ele -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> UniqFM key ele -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> UniqFM key ele -> m (UniqFM key ele) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> UniqFM key ele -> m (UniqFM key ele) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> UniqFM key ele -> m (UniqFM key ele) Source #
Monoid (UniqFM key a) Source #
Instance details Defined in GHC.Types.Unique.FM Methods mempty :: UniqFM key a Source # mappend :: UniqFM key a -> UniqFM key a -> UniqFM key a Source # mconcat :: [UniqFM key a] -> UniqFM key a Source #
Semigroup (UniqFM key a) Source #
Instance details Defined in GHC.Types.Unique.FM Methods (<>) :: UniqFM key a -> UniqFM key a -> UniqFM key a Source # sconcat :: NonEmpty (UniqFM key a) -> UniqFM key a Source # stimes :: Integral b => b -> UniqFM key a -> UniqFM key a Source #
Outputable a => Outputable (UniqFM key a) Source #
Instance details Defined in GHC.Types.Unique.FM Methods ppr :: UniqFM key a -> SDoc Source #
Eq ele => Eq (UniqFM key ele) Source #
Instance details Defined in GHC.Types.Unique.FM Methods (==) :: UniqFM key ele -> UniqFM key ele -> Bool # (/=) :: UniqFM key ele -> UniqFM key ele -> Bool #

newtype NonDetUniqFM key ele Source #

A wrapper around UniqFM with the sole purpose of informing call sites that the provided Foldable and Traversable instances are nondeterministic. If you use this please provide a justification why it doesn't introduce nondeterminism. See Note [Deterministic UniqFM] in GHC.Types.Unique.DFM to learn about determinism.

Constructors

NonDetUniqFM
Fields getNonDet :: UniqFM key ele

Instances

Instances details

Foldable (NonDetUniqFM key) Source #	Inherently nondeterministic. If you use this please provide a justification why it doesn't introduce nondeterminism. See Note [Deterministic UniqFM] in GHC.Types.Unique.DFM to learn about determinism.
Instance details Defined in GHC.Types.Unique.FM Methods fold :: Monoid m => NonDetUniqFM key m -> m Source # foldMap :: Monoid m => (a -> m) -> NonDetUniqFM key a -> m Source # foldMap' :: Monoid m => (a -> m) -> NonDetUniqFM key a -> m Source # foldr :: (a -> b -> b) -> b -> NonDetUniqFM key a -> b Source # foldr' :: (a -> b -> b) -> b -> NonDetUniqFM key a -> b Source # foldl :: (b -> a -> b) -> b -> NonDetUniqFM key a -> b Source # foldl' :: (b -> a -> b) -> b -> NonDetUniqFM key a -> b Source # foldr1 :: (a -> a -> a) -> NonDetUniqFM key a -> a Source # foldl1 :: (a -> a -> a) -> NonDetUniqFM key a -> a Source # toList :: NonDetUniqFM key a -> [a] Source # null :: NonDetUniqFM key a -> Bool Source # length :: NonDetUniqFM key a -> Int Source # elem :: Eq a => a -> NonDetUniqFM key a -> Bool Source # maximum :: Ord a => NonDetUniqFM key a -> a Source # minimum :: Ord a => NonDetUniqFM key a -> a Source # sum :: Num a => NonDetUniqFM key a -> a Source # product :: Num a => NonDetUniqFM key a -> a Source #
Traversable (NonDetUniqFM key) Source #	Inherently nondeterministic. If you use this please provide a justification why it doesn't introduce nondeterminism. See Note [Deterministic UniqFM] in GHC.Types.Unique.DFM to learn about determinism.
Instance details Defined in GHC.Types.Unique.FM Methods traverse :: Applicative f => (a -> f b) -> NonDetUniqFM key a -> f (NonDetUniqFM key b) Source # sequenceA :: Applicative f => NonDetUniqFM key (f a) -> f (NonDetUniqFM key a) Source # mapM :: Monad m => (a -> m b) -> NonDetUniqFM key a -> m (NonDetUniqFM key b) Source # sequence :: Monad m => NonDetUniqFM key (m a) -> m (NonDetUniqFM key a) Source #
Functor (NonDetUniqFM key) Source #
Instance details Defined in GHC.Types.Unique.FM Methods fmap :: (a -> b) -> NonDetUniqFM key a -> NonDetUniqFM key b Source # (<$) :: a -> NonDetUniqFM key b -> NonDetUniqFM key a Source #

Manipulating those mappings

emptyUFM :: UniqFM key elt Source #

unitUFM :: Uniquable key => key -> elt -> UniqFM key elt Source #

unitDirectlyUFM :: Unique -> elt -> UniqFM key elt Source #

zipToUFM :: Uniquable key => [key] -> [elt] -> UniqFM key elt Source #

listToUFM :: Uniquable key => [(key, elt)] -> UniqFM key elt Source #

listToUFM_Directly :: [(Unique, elt)] -> UniqFM key elt Source #

listToUFM_C :: Uniquable key => (elt -> elt -> elt) -> [(key, elt)] -> UniqFM key elt Source #

listToIdentityUFM :: Uniquable key => [key] -> UniqFM key key Source #

addToUFM :: Uniquable key => UniqFM key elt -> key -> elt -> UniqFM key elt Source #

addToUFM_C Source #

Arguments

:: Uniquable key
=> (elt -> elt -> elt)	old -> new -> result
-> UniqFM key elt	old
-> key
-> elt	new
-> UniqFM key elt	result Arguments of combining function of M.insertWith and addToUFM_C are flipped.

addToUFM_Acc :: Uniquable key => (elt -> elts -> elts) -> (elt -> elts) -> UniqFM key elts -> key -> elt -> UniqFM key elts Source #

addToUFM_L Source #

Arguments

:: Uniquable key
=> (key -> elt -> elt -> elt)	key,old,new
-> key
-> elt
-> UniqFM key elt
-> (Maybe elt, UniqFM key elt)	old, result

Add an element, returns previous lookup result and new map. If old element doesn't exist, add the passed element directly, otherwise compute the element to add using the passed function.

addListToUFM :: Uniquable key => UniqFM key elt -> [(key, elt)] -> UniqFM key elt Source #

addListToUFM_C :: Uniquable key => (elt -> elt -> elt) -> UniqFM key elt -> [(key, elt)] -> UniqFM key elt Source #

Add elements to the map, combining existing values with inserted ones using the given function.

addToUFM_Directly :: UniqFM key elt -> Unique -> elt -> UniqFM key elt Source #

addListToUFM_Directly :: UniqFM key elt -> [(Unique, elt)] -> UniqFM key elt Source #

adjustUFM :: Uniquable key => (elt -> elt) -> UniqFM key elt -> key -> UniqFM key elt Source #

alterUFM Source #

Arguments

:: Uniquable key
=> (Maybe elt -> Maybe elt)	How to adjust
-> UniqFM key elt	old
-> key	new
-> UniqFM key elt	result

alterUFM_Directly Source #

Arguments

:: (Maybe elt -> Maybe elt)	How to adjust
-> UniqFM key elt	old
-> Unique	new
-> UniqFM key elt	result

adjustUFM_Directly :: (elt -> elt) -> UniqFM key elt -> Unique -> UniqFM key elt Source #

delFromUFM :: Uniquable key => UniqFM key elt -> key -> UniqFM key elt Source #

delFromUFM_Directly :: UniqFM key elt -> Unique -> UniqFM key elt Source #

delListFromUFM :: Uniquable key => UniqFM key elt -> [key] -> UniqFM key elt Source #

delListFromUFM_Directly :: UniqFM key elt -> [Unique] -> UniqFM key elt Source #

plusUFM :: UniqFM key elt -> UniqFM key elt -> UniqFM key elt Source #

plusUFM_C :: (elt -> elt -> elt) -> UniqFM key elt -> UniqFM key elt -> UniqFM key elt Source #

plusUFM_CD :: (elta -> eltb -> eltc) -> UniqFM key elta -> elta -> UniqFM key eltb -> eltb -> UniqFM key eltc Source #

`plusUFM_CD f m1 d1 m2 d2` merges the maps using f as the combinding function and d1 resp. d2 as the default value if there is no entry in m1 reps. m2. The domain is the union of the domains of m1 and m2.

IMPORTANT NOTE: This function strictly applies the modification function and forces the result unlike most the other functions in this module.

Representative example:

plusUFM_CD f {A: 1, B: 2} 23 {B: 3, C: 4} 42
   == {A: f 1 42, B: f 2 3, C: f 23 4 }

plusUFM_CD2 :: (Maybe elta -> Maybe eltb -> eltc) -> UniqFM key elta -> UniqFM key eltb -> UniqFM key eltc Source #

`plusUFM_CD2 f m1 m2` merges the maps using f as the combining function. Unlike plusUFM_CD, a missing value is not defaulted: it is instead passed as Nothing to f. f can never have both its arguments be Nothing.

IMPORTANT NOTE: This function strictly applies the modification function and forces the result.

`plusUFM_CD2 f m1 m2` is the same as `plusUFM_CD f (mapUFM Just m1) Nothing (mapUFM Just m2) Nothing`.

mergeUFM :: (elta -> eltb -> Maybe eltc) -> (UniqFM key elta -> UniqFM key eltc) -> (UniqFM key eltb -> UniqFM key eltc) -> UniqFM key elta -> UniqFM key eltb -> UniqFM key eltc Source #

plusMaybeUFM_C :: (elt -> elt -> Maybe elt) -> UniqFM key elt -> UniqFM key elt -> UniqFM key elt Source #

plusUFMList :: [UniqFM key elt] -> UniqFM key elt Source #

plusUFMListWith :: (elt -> elt -> elt) -> [UniqFM key elt] -> UniqFM key elt Source #

sequenceUFMList :: [UniqFM key elt] -> UniqFM key [elt] Source #

minusUFM :: UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1 Source #

minusUFM_C :: (elt1 -> elt2 -> Maybe elt1) -> UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1 Source #

minusUFC_C f map1 map2 returns map1, except that every mapping key |-> value1 in map1 that shares a key with a mapping key |-> value2 in map2 is altered by f: value1 is replaced by f value1 value2, where Just means that the new value is used and Nothing means that the mapping is deleted.

intersectUFM :: UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt1 Source #

intersectUFM_C :: (elt1 -> elt2 -> elt3) -> UniqFM key elt1 -> UniqFM key elt2 -> UniqFM key elt3 Source #

disjointUFM :: UniqFM key elt1 -> UniqFM key elt2 -> Bool Source #

equalKeysUFM :: UniqFM key a -> UniqFM key b -> Bool Source #

nonDetStrictFoldUFM :: (elt -> a -> a) -> a -> UniqFM key elt -> a Source #

nonDetFoldUFM :: (elt -> a -> a) -> a -> UniqFM key elt -> a Source #

Fold over a UniqFM.

Non-deterministic, unless the folding function is commutative (i.e. a1 f ( a2 f b ) == a2 f ( a1 f b ) for all a1, a2, b).

nonDetStrictFoldUFM_DirectlyM :: Monad m => (Unique -> b -> elt -> m b) -> b -> UniqFM key elt -> m b Source #

In essence foldM See Note [Deterministic UniqFM] to learn about nondeterminism. If you use this please provide a justification why it doesn't introduce nondeterminism.

nonDetFoldWithKeyUFM :: (Unique -> elt -> a -> a) -> a -> UniqFM key elt -> a Source #

Like nonDetFoldUFM, but with the Unique key as well.

nonDetStrictFoldUFM_Directly :: (Unique -> elt -> a -> a) -> a -> UniqFM key elt -> a Source #

anyUFM :: (elt -> Bool) -> UniqFM key elt -> Bool Source #

allUFM :: (elt -> Bool) -> UniqFM key elt -> Bool Source #

seqEltsUFM :: (elt -> ()) -> UniqFM key elt -> () Source #

mapUFM :: (elt1 -> elt2) -> UniqFM key elt1 -> UniqFM key elt2 Source #

mapUFM_Directly :: (Unique -> elt1 -> elt2) -> UniqFM key elt1 -> UniqFM key elt2 Source #

strictMapUFM :: (a -> b) -> UniqFM k a -> UniqFM k b Source #

mapMaybeUFM :: (elt1 -> Maybe elt2) -> UniqFM key elt1 -> UniqFM key elt2 Source #

mapMaybeWithKeyUFM :: (Unique -> elt1 -> Maybe elt2) -> UniqFM key elt1 -> UniqFM key elt2 Source #

elemUFM :: Uniquable key => key -> UniqFM key elt -> Bool Source #

elemUFM_Directly :: Unique -> UniqFM key elt -> Bool Source #

filterUFM :: (elt -> Bool) -> UniqFM key elt -> UniqFM key elt Source #

filterUFM_Directly :: (Unique -> elt -> Bool) -> UniqFM key elt -> UniqFM key elt Source #

partitionUFM :: (elt -> Bool) -> UniqFM key elt -> (UniqFM key elt, UniqFM key elt) Source #

sizeUFM :: UniqFM key elt -> Int Source #

isNullUFM :: UniqFM key elt -> Bool Source #

lookupUFM :: Uniquable key => UniqFM key elt -> key -> Maybe elt Source #

lookupUFM_Directly :: UniqFM key elt -> Unique -> Maybe elt Source #

lookupWithDefaultUFM :: Uniquable key => UniqFM key elt -> elt -> key -> elt Source #

lookupWithDefaultUFM_Directly :: UniqFM key elt -> elt -> Unique -> elt Source #

nonDetEltsUFM :: UniqFM key elt -> [elt] Source #

nonDetKeysUFM :: UniqFM key elt -> [Unique] Source #

ufmToSet_Directly :: UniqFM key elt -> Word64Set Source #

nonDetUFMToList :: UniqFM key elt -> [(Unique, elt)] Source #

ufmToIntMap :: UniqFM key elt -> Word64Map elt Source #

unsafeIntMapToUFM :: Word64Map elt -> UniqFM key elt Source #

unsafeCastUFMKey :: UniqFM key1 elt -> UniqFM key2 elt Source #

Cast the key domain of a UniqFM.

As long as the domains don't overlap in their uniques this is safe.

pprUniqFM :: (a -> SDoc) -> UniqFM key a -> SDoc Source #

pprUFM Source #

Arguments

:: UniqFM key a	The things to be pretty printed
-> ([a] -> SDoc)	The pretty printing function to use on the elements
-> SDoc	`SDoc` where the things have been pretty printed

Pretty-print a non-deterministic set. The order of variables is non-deterministic and for pretty-printing that shouldn't be a problem. Having this function helps contain the non-determinism created with nonDetEltsUFM.

pprUFMWithKeys Source #

Arguments

:: UniqFM key a	The things to be pretty printed
-> ([(Unique, a)] -> SDoc)	The pretty printing function to use on the elements
-> SDoc	`SDoc` where the things have been pretty printed

Pretty-print a non-deterministic set. The order of variables is non-deterministic and for pretty-printing that shouldn't be a problem. Having this function helps contain the non-determinism created with nonDetUFMToList.

pluralUFM :: UniqFM key a -> SDoc Source #

Determines the pluralisation suffix appropriate for the length of a set in the same way that plural from Outputable does for lists.