联合体方法

    2. mut:
    3.     bytes [10]byte
    4.     xu64  u64
    5.     xu16  u16
    7. }
    9. pub fn (m MyAnything) str() string {
    10.     return 'from union'
    12. fn main() {
    13.     mut x := MyAnything{}
    14.     x.xint = 1234
    15.     println(x.str())
    16. }