1const U = union {
2 a: void,
3 b: u64,
4};
5comptime {
6 var u: U = .{ .a = {} };
7 const v = u.b;
8 _ = &u;
9 _ = v;
10}
11
12// error
13//
14// :7:16: error: access of union field 'b' while field 'a' is active
15// :1:11: note: union declared here