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Diffstat (limited to 'compiler/GHC/Utils/Monad.hs')
| -rw-r--r-- | compiler/GHC/Utils/Monad.hs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/GHC/Utils/Monad.hs b/compiler/GHC/Utils/Monad.hs index d91570223c..e5a8007865 100644 --- a/compiler/GHC/Utils/Monad.hs +++ b/compiler/GHC/Utils/Monad.hs @@ -11,6 +11,7 @@ module GHC.Utils.Monad , MonadIO(..) , zipWith3M, zipWith3M_, zipWith4M, zipWithAndUnzipM + , zipWith3MNE , mapAndUnzipM, mapAndUnzip3M, mapAndUnzip4M, mapAndUnzip5M , mapAccumLM , mapSndM @@ -97,6 +98,15 @@ zipWithAndUnzipM f (x:xs) (y:ys) ; return (c:cs, d:ds) } zipWithAndUnzipM _ _ _ = return ([], []) +-- | 'zipWith3M' for 'NonEmpty' lists. +zipWith3MNE :: Monad m + => (a -> b -> c -> m d) + -> NonEmpty a -> NonEmpty b -> NonEmpty c -> m (NonEmpty d) +zipWith3MNE f ~(x :| xs) ~(y :| ys) ~(z :| zs) + = do { w <- f x y z + ; ws <- zipWith3M f xs ys zs + ; return $ w :| ws } + {- Note [Inline @mapAndUnzipNM@ functions] |