rustling有些测试官方代码会报错

[bugparty]

评测练习: hashmaps2.rs

error[E0599]: no function or associated item named from_iter found for struct std::collections::HashMap in the current scope
--> /Users/bowmanhan/sources/learning-tools/./exercises/rustlings/exercises/11_hashmaps/hashmaps2.rs:61:18
|
61 | HashMap::from_iter(content)
| ^^^^^^^^^ function or associated item not found in HashMap<_, _, _>
|
note: if you're trying to build a new std::collections::HashMap<_, _, _> consider using one of the following associated functions:
std::collections::HashMap::<K, V>::new
std::collections::HashMap::<K, V>::with_capacity
std::collections::HashMap::<K, V, S>::with_hasher
std::collections::HashMap::<K, V, S>::with_capacity_and_hasher
--> /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/collections/hash/map.rs:261:5
= help: items from traits can only be used if the trait is in scope
help: trait FromIterator which provides from_iter is implemented but not in scope; perhaps you want to import it
|
56 + use std::iter::FromIterator;
|

error: aborting due to 1 previous error

For more information about this error, try rustc --explain E0599.

[wawahejun]

这个应该是Rust 的from_iter()方法来自FromIterator trait，需要显式导入才能使用。虽然标准库提供了这个方法，但 Rust 不会自动导入所有可能的 trait