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Rust代码答疑报错｜Python一对一辅导答疑

news 来源：原创 2024/9/20 13:27:54

Question

你好，我是悦创。

学员答疑：

在这里插入图片描述

https://code.bornforthis.cn/?id=4e72084d-1eaf-44ed-8067-744671491574
https://code.bornforthis.cn/?id=664ff169-41d6-409f-a05b-02ed42279759

问题代码：

// You can bring module paths into scopes and provide new names for them with
// the `use` and `as` keywords.#[allow(dead_code)]
mod delicious_snacks {// TODO: Add the following two `use` statements after fixing them.use self::fruits::PEAR as fruits;use self::veggies::CUCUMBER as veggies;pub mod fruits {pub const PEAR: &amp;str = "Pear";pub const APPLE: &amp;str = "Apple";}pub mod veggies {pub const CUCUMBER: &amp;str = "Cucumber";pub const CARROT: &amp;str = "Carrot";}
}fn main() {println!("favorite snacks: {} and {}",delicious_snacks::fruit,delicious_snacks::veggie,);
}

报错：

D:\LagerA\rust\a-ex\rustlings git:[master]
rustlings run modules2
error[E0425]: cannot find value `fruit` in module `delicious_snacks`--> exercises/10_modules/modules2.rs:25:27|
11 |         pub const PEAR: &amp;str = "Pear";|         ------------------------------ similarly named constant `fruits` defined here
...
25 |         delicious_snacks::fruit,|                           ^^^^^ help: a constant with a similar name exists: `fruits`error[E0425]: cannot find value `veggie` in module `delicious_snacks`--> exercises/10_modules/modules2.rs:26:27|
16 |         pub const CUCUMBER: &amp;str = "Cucumber";|         -------------------------------------- similarly named constant `veggies` defined here
...
26 |         delicious_snacks::veggie,|                           ^^^^^^ help: a constant with a similar name exists: `veggies`warning: unused import: `self::fruits::PEAR as fruits`--> exercises/10_modules/modules2.rs:7:9|
7 |     use self::fruits::PEAR as fruits;|         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^|= note: `#[warn(unused_imports)]` on by defaultwarning: unused import: `self::veggies::CUCUMBER as veggies`--> exercises/10_modules/modules2.rs:8:9|
8 |     use self::veggies::CUCUMBER as veggies; |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  For more information about this error, try `rustc --explain E0425`.
error: could not compile `exercises` (bin "modul
es2") due to 2 previous errors; 2 warnings emittedError: Ran exercises/10_modules/modules2.rs with errors

Solution

#[allow(dead_code)]
mod delicious_snacks {// 使用 `use` 语句将常量导入到模块的顶层作用域pub use self::fruits::PEAR as fruit;pub use self::veggies::CUCUMBER as veggie;pub mod fruits {pub const PEAR: &str = "Pear";pub const APPLE: &str = "Apple";}pub mod veggies {pub const CUCUMBER: &str = "Cucumber";pub const CARROT: &str = "Carrot";}
}fn main() {println!("favorite snacks: {} and {}",delicious_snacks::fruit,delicious_snacks::veggie,);
}