X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FUniqSet.lhs;h=6d39e00e40b7f00d279b5c1d777122106f3b0c8b;hb=9aad47f1162666431deee99884c523b1ff69cf98;hp=9a0331547d7ba406beb92aaa2669f30eb2a919bd;hpb=1370a4a360ec154b390c1da21d40e446739b24c8;p=ghc-hetmet.git

diff --git a/compiler/utils/UniqSet.lhs b/compiler/utils/UniqSet.lhs
index 9a03315..6d39e00 100644
--- a/compiler/utils/UniqSet.lhs
+++ b/compiler/utils/UniqSet.lhs
@@ -10,8 +10,10 @@ Basically, the things need to be in class @Uniquable@.
 
 \begin{code}
 module UniqSet (
+        -- * Unique set type
         UniqSet,    -- abstract type: NOT
 
+        -- ** Manipulating these sets
         mkUniqSet, uniqSetToList, emptyUniqSet, unitUniqSet,
         addOneToUniqSet, addListToUniqSet, addOneToUniqSet_C,
         delOneFromUniqSet, delListFromUniqSet, delOneFromUniqSet_Directly,
@@ -118,8 +120,8 @@ hashUniqSet (MkUniqSet set) = hashUFM set
 isEmptyUniqSet :: UniqSet a -> Bool
 isEmptyUniqSet (MkUniqSet set) = isNullUFM set {-SLOW: sizeUFM set == 0-}
 
-mapUniqSet :: (a -> a) -> UniqSet a -> UniqSet a
-  -- VERY IMPORTANT: *assumes* that the function doesn't change the unique
+-- | Invariant: the mapping function doesn't change the unique
+mapUniqSet :: (a -> b) -> UniqSet a -> UniqSet b
 mapUniqSet f (MkUniqSet set) = MkUniqSet (mapUFM f set)
 \end{code}