I don't remember exactly how it works in OCaml (it might be similar!) but in Haskell, I think functions beginning with certain characters are automatically oper

I don't remember exactly how it works in OCaml (it might be similar!) but in Haskell, I think functions beginning with certain characters are automatically operators, but you can use them prefix by wrapping them in parens, e.g. `2 + 2` is the same as `(+) 2 2`. Similarly, a two-parameter function can be used infix by wrapping in backticks. Off the top of my head, I think I remember getting warnings from the linter about saying something like "elem some_list some_elem" to check if an element existed in the list instead of the preferred "some_list `elem` some_elem". The idea that functions are operators are interchangeable and have first-class syntax for swapping between them is a lot of fun, but also one of those things where I feel like I'm kinda glad it's not mainstream due to the shenanigans that I might have to deal with in production code.