module main

type Float = f32

struct Note {
mut:
    seen string
}

fn (mut n Note) bad_call(value ?Float) {
    if val := value {
        n.seen += ', ${val}'
    }
}

fn (mut n Note) good_call(value ?f32) {
    if val := value {
        n.seen += ', ${val}'
    }
}

fn test_main() {
    mut good := Note{}
    mut bad := Note{}
    mut c := 0
    for {
        good.good_call(f32(c))
        bad.bad_call(Float(c))
        c += 1
        if c >= 5 {
            break
        }
    }
    assert '${good.seen}' == '${bad.seen}'
}