struct Aaa {}
enum Color {
red
green
blue
}
fn main() {
println(Aaa{} - 10)
println(10 - Aaa{})
println([1, 2, 3] - 10)
println(10 - [1, 2, 3])
a := map[string]int{}
println(a - 10)
println(10 - a)
println(-Aaa{})
println(-a)
println(-Color.red)