struct CmdA {
int a, b;
}
struct CmdB {
float a, b;
union AnyCmd {
CmdA a;
CmdB b;
struct Cmd {
int type;
AnyCmd cmd;
fn int main()
{
Cmd c;
c.type = 1;
c.cmd.a = {.a = 1, .b = 2};
return 0;
