typedef a = enum();
typedef b = enum(x);
typedef c = enum(x,y);
typedef d = enum(x,y,);
typedef e = enum(x=10, y);

typedef f = int enum();
typedef g = int enum(x,y);
typedef h = int enum(x=10,y);
typedef i = (int x,int y) enum(
    left=(-1,0), right=(1,0), up=(0,-1), down=(0,1)
);

typedef j = enum(x,y);