It doesn't. They are useful for the REPL only, to tell it that a statement is over. I prefer this over what Python does, which is to consider that an empty li

It doesn't. They are useful for the REPL only, to tell it that a statement is over. I prefer this over what Python does, which is to consider that an empty line is the end of a statement. Copy-pasting functions from a file to the REPL can be a bit tedious because of this. In OCaml, all I have to do is to add ;;<enter>, and I'm good to go.