pub struct Association {
    price       string
    association &Association = unsafe { nil }
}

// needed to check the condition for #20400
fn myprintln(s string) string {
    println('---------> ${s}')
    return s
}

fn encode_struct[U](a U) {
    mut c := 0
    $for field in U.fields {
        $if field.name == 'association' {
            x := myprintln(ptr_str(a.$(field.name)))
            println(field.name)
            c += 1
            assert ptr_str(a.$(field.name)) == '0'
        } $else {
            println(field.name)
            c += 1
            assert ptr_str(a.$(field.name)) != '0'
        }
        x := myprintln(ptr_str(a.$(field.name)))
        if field.name == 'association' {
            dump(x)
            assert x == '0'
        }
    }
    dump(c)
    assert c == 2
}

fn test_main() {
    a := Association{}

    assert ptr_str(a.price) != '0'
    assert ptr_str(a.association) == '0'
    encode_struct(a)
}