I like that Data.Sequence bypasses this whole issue by just not doing anything special: empty |> ("one" , 1) |> ("two" , 2) |> ("three"

I like that Data.Sequence bypasses this whole issue by just not doing anything special: empty |> ("one" , 1) |> ("two" , 2) |> ("three", 3) Edit: It's interesting that, when we have things that are supposed to commute, we use infix operators that create a layout that makes it difficult to reorder them.