import String from "string"
import File from "sys/file"
let rec fib = n => if (n < 2) {
  n
} else {
  fib(n - 1) + fib(n - 2)
}
for (let mut i = 0; i <= 20; i += 1) {
  File.fdWrite(File.stdout, Pervasives.toString(fib(i)))
  ignore(File.fdWrite(File.stdout, " "))
}