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Diffstat (limited to 'compiler/GHC/Utils/Misc.hs')
| -rw-r--r-- | compiler/GHC/Utils/Misc.hs | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/compiler/GHC/Utils/Misc.hs b/compiler/GHC/Utils/Misc.hs index a115c61336..50ede55909 100644 --- a/compiler/GHC/Utils/Misc.hs +++ b/compiler/GHC/Utils/Misc.hs @@ -637,8 +637,9 @@ all2 _ [] [] = True all2 p (x:xs) (y:ys) = p x y && all2 p xs ys all2 _ _ _ = False --- Count the number of times a predicate is true - +-- | Count the number of times a predicate is true +-- +-- A manually fused alternative to @length . filter p@ count :: (a -> Bool) -> [a] -> Int count p = go 0 where go !n [] = n |