1const Foo = union {
 2    Bar: i32,
 3    Bar: usize,
 4};
 5export fn entry() void {
 6    const a: Foo = undefined;
 7    _ = a;
 8}
 9
10// error
11//
12// :2:5: error: duplicate union member name 'Bar'
13// :3:5: note: duplicate name here
14// :1:13: note: union declared here