I think you can in rust as long as args is a slice. Rust doesn't have varargs except for c interop. A slice or Vec of function pointers is the idiomatic way to do the same thing.

Something like:

  fn compose<X, T>(start: Box<Fn(T) -> X>, args: Vec<Box<Fn(T) -> T>>) -> Fn(T) -> X {
    move |x: X| {
      let mut x = x;
      for func in args.iter(). reversed() {
        x = func(x);
      }
      start(x)
    }
  }