struct MapRefShapes {
mut:
    rectangles []MapRefRectangle
}

struct MapRefRectangle {
mut:
    id     int
    square bool
}

fn (shapes MapRefShapes) get_squares() []&MapRefRectangle {
    return shapes.rectangles.filter(it.square).filter(it.id > 0).map(&it)
}

fn test_array_map_ref_it_after_filter_keeps_struct_fields() {
    mut shapes := MapRefShapes{}
    shapes.rectangles << MapRefRectangle{
        id:     1
        square: true
    }
    shapes.rectangles << MapRefRectangle{
        id:     2
        square: false
    }

    squares := shapes.get_squares()
    rendered := '${squares}'

    assert squares.len == 1
    assert squares[0].id == 1
    assert squares[0].square
    assert rendered.contains('id: 1')
    assert rendered.contains('square: true')
}