struct Foo[T] {
pub:
    data T
}

fn (f Foo[int]) value() string {
    return f.data.str()
}

type DB = string

struct Repo[T, U] {
    db DB
pub mut:
    model      T
    permission U
}

struct User {
mut:
    name string
}

struct Permission {
pub mut:
    name string
}

fn main() {
    foo_int := Foo[int]{2}
    assert foo_int.value() == '2'
    println(foo_int)
    //
    x := Repo[int, f64]{'abc', 3, 1.5}
    println(x.db)
    println(x.model)
    println(x.permission)
    //
    mut a := Repo[User, Permission]{
        model: User{
            name: 'joe'
        }
    }
    println(a.model.name)
}