如何声明一个接受任何可以转换为HashMap<String,String>的函数的函数

我有一个看起来像这样的结构:

struct Fields {
    map: HashMap
}

对于人体工程学,我想要一个接受&str和的功能String.我读到它HashMap有一个特征FromIterator<(K, V)>,所以在抽象层面上,我可以从产生成对的迭代器的任何东西中变成字符串.

类似地,如果我想要一个接受任何可以转换为a的函数的函数String,我可以使用该约束T: Into.

可以对可以转换为字符串的对的迭代器进行相同的操作吗？概念:

fn set_map, Into)>>(fields: I) {
    // ...
}

这个错误

error[E0277]: the trait bound `std::convert::Into + 'static: std::marker::Sized` is not satisfied
 --> src/main.rs:1:1
  |
1 | / fn set_map, Into)>>(fields: I) {
2 | |     // ...
3 | | }
  | |_^ `std::convert::Into + 'static` does not have a constant size known at compile-time
  |
  = help: the trait `std::marker::Sized` is not implemented for `std::convert::Into + 'static`
  = note: only the last element of a tuple may have a dynamically sized type

error[E0038]: the trait `std::convert::Into` cannot be made into an object
 --> src/main.rs:1:1
  |
1 | fn set_map, Into)>>(fields: I) {
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::Into` cannot be made into an object
  |
  = note: the trait cannot require that `Self : Sized`

fn set_map, T: Into, I: IntoIterator>(fields: I) {
    ...
}

fn set_map, T: Into, I: IntoIterator>(fields: I) {
    ...
}