Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/prelude/List/InsertBy.hs
module List where insertBy :: (a -> a -> Ordering) -> a -> [a] -> [a] insertBy cmp x [] = [x] insertBy cmp x ys@(y:ys') = case cmp x y of GT -> y : insertBy cmp x ys' _ -> x : ys