1export fn a() void {
 2    const E = enum {};
 3    var e: E = undefined;
 4    _ = &e;
 5    _ = @intFromEnum(e);
 6}
 7
 8// error
 9//
10// :5:22: error: cannot use @intFromEnum on empty enum 'tmp.a.E'
11// :2:15: note: enum declared here