forked from mirrors/nixpkgs
34 lines
1.4 KiB
Diff
34 lines
1.4 KiB
Diff
diff --git a/server/src-lib/Data/HashMap/Strict/Extended.hs b/server/src-lib/Data/HashMap/Strict/Extended.hs
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index eaff0dfba..9902cadd0 100644
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--- a/src-lib/Data/HashMap/Strict/Extended.hs
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+++ b/src-lib/Data/HashMap/Strict/Extended.hs
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@@ -7,7 +7,6 @@ module Data.HashMap.Strict.Extended
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, groupOnNE
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, differenceOn
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, lpadZip
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- , mapKeys
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, unionsWith
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) where
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@@ -54,20 +53,6 @@ lpadZip left = catMaybes . flip A.alignWith left \case
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That b -> Just (Nothing, b)
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These a b -> Just (Just a, b)
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--- | @'mapKeys' f s@ is the map obtained by applying @f@ to each key of @s@.
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---
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--- The size of the result may be smaller if @f@ maps two or more distinct
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--- keys to the same new key. In this case the value at the greatest of the
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--- original keys is retained.
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---
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--- > mapKeys (+ 1) (fromList [(5,"a"), (3,"b")]) == fromList [(4, "b"), (6, "a")]
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--- > mapKeys (\ _ -> 1) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 1 "c"
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--- > mapKeys (\ _ -> 3) (fromList [(1,"b"), (2,"a"), (3,"d"), (4,"c")]) == singleton 3 "c"
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---
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--- copied from https://hackage.haskell.org/package/containers-0.6.4.1/docs/src/Data.Map.Internal.html#mapKeys
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-mapKeys :: (Ord k2, Hashable k2) => (k1 -> k2) -> HashMap k1 a -> HashMap k2 a
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-mapKeys f = fromList . foldrWithKey (\k x xs -> (f k, x) : xs) []
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-
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-- | The union of a list of maps, with a combining operation:
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-- (@'unionsWith' f == 'Prelude.foldl' ('unionWith' f) 'empty'@).
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--
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