type TestSum = int | string

struct Bar {
    y int
}

struct Foo {
mut:
    a TestSum
    b int
    c string
    d Bar
}

fn main() {
    $for f in Foo.fields {
        $if f.typ is $sumtype {
            dump(f.name)
            $for f2 in f.variants {
                $if f2.typ is $int {
                    assert f2.typ == typeof[int]().idx
                    dump('int')
                } $else $if f2.typ is $string {
                    dump('string')
                    assert f2.typ == typeof[string]().idx
                }
            }
        } $else $if f.typ is Bar {
            $for f3 in f.fields {
                assert f3.typ == typeof[int]().idx
                dump(f3.name)
            }
        }
    }
}