1const E = enum {
 2    a,
 3    b,
 4    c,
 5};
 6
 7const U = union(E) {
 8    a: i32,
 9    b: f64,
10};
11
12export fn entry() usize {
13    return @sizeOf(U);
14}
15
16// error
17//
18// :7:11: error: enum field(s) missing in union
19// :4:5: note: field 'c' missing, declared here
20// :1:11: note: enum declared here