有没有可能构建一个宏，它不输出任何东西，而是例如存储状态以构建一个列表，然后第二个宏将实际使用该数据并输出一些结果？
例如：

trait SomeTrait {}

#[derive(mark)]
struct Person {}

impl SomeTrait for Person {}

#[derive(mark)]
struct Item {}

impl SomeTrait for Item  {}

#[derive(mark)]
struct Object {}

impl SomeTrait for Object {}

create_mapper!() // this then outputs the below function
//assuming for the fact that data is loaded correctly before this macro is used

fn select_item(kind: String) -> impl SomeTrait {
    match kind {
        "person" => Person,
        "item" => Item,
        "object" => Object,        
    }
}