struct FooParams[K, V] {
    k  K
    v  V
    k2 K
}

struct Foo[K, V] {
    k K
mut:
    m map[K]V
}

fn new_foo[K, V](params FooParams[K, V]) Foo[K, V] {
    return Foo[K, V]{
        k: params.k2
        m: {
            params.k: params.v
        }
    }
}

fn (mut p Foo[K, V]) f() {
    mut y := p.m.move()
    y.clear()
    y.reserve(6)
    y.delete(p.k)
    assert y.keys().len == 0
    assert y.values().len == 0
    assert y.clone().len == 0
    unsafe { y.free() }
}

fn test_main() {
    mut foo := new_foo(FooParams{ k: 'abc', v: 42, k2: 'def' })
    foo.f()
}