module main

type Foo = string | int | f32

struct Svc {
mut:
    log ?Foo
}

fn t(v string) !string {
    return v
}

fn Svc.init(log ?Foo) Svc {
    mut svc := Svc{
        log: log
    }
    if svc.log != none {
        if svc.log is string {
            assert svc.log.str() == 'foo'
            _ := t(svc.log) or { panic(err) }
        } else {
            assert false
        }
        assert true
    }
    return svc
}

struct CSvc {
    Svc
pub mut:
    log ?Foo
}

pub fn CSvc.init(log ?Foo) CSvc {
    mut c := CSvc{
        log: log
    }
    c.Svc = Svc.init(log)
    return c
}

fn test_main() {
    CSvc.init('foo')
}