-assocMaybe :: (Eq a) => [(a,b)] -> a -> Maybe b
-
-assocMaybe alist key
- = lookup alist
- where
- lookup [] = Nothing
- lookup ((tv,ty):rest) = if key == tv then Just ty else lookup rest
-
-#if defined(COMPILING_GHC)
-{-# SPECIALIZE assocMaybe
- :: [(String, b)] -> String -> Maybe b,
- [(Id, b)] -> Id -> Maybe b,
- [(Class, b)] -> Class -> Maybe b,
- [(Int, b)] -> Int -> Maybe b,
- [(Name, b)] -> Name -> Maybe b,
- [(TyVar, b)] -> TyVar -> Maybe b,
- [(TyVarTemplate, b)] -> TyVarTemplate -> Maybe b
- #-}
-#endif
+mapCatMaybes :: (a -> Maybe b) -> [a] -> [b]
+mapCatMaybes f [] = []
+mapCatMaybes f (x:xs) = case f x of
+ Just y -> y : mapCatMaybes f xs
+ Nothing -> mapCatMaybes f xs