import "io" for Directory

var isEmptyDir = Fn.new { |path|
    if (!Directory.exists(path)) Fiber.abort("Directory at '%(path)' does not exist.")
    return Directory.list(path).count == 0
}

var path = "test"
var empty = isEmptyDir.call(path)
System.print("'%(path)' is %(empty ? "empty" : "not empty")")