struct Test {
    something string
}

struct Dependency {}

struct Factory {
    build fn () !
}

fn inject[T](mut serv T) ! {
    $for field in T.fields {
        if field.typ is string {
            serv.$(field.name) = 'Hello world!'
        }
    }
}

fn use_factory[F, E](factory fn (dep F) !E) Factory {
    return Factory{
        build: fn [factory] [F]() ! {
            mut dep := F{}
            inject[F](mut dep)!
            dump(factory(dep)!)
        }
    }
}

use_factory[Dependency, Test](fn (dep Dependency) !Test {
    return Test{
        something: 'daleks!'
    }
}).build()!