Import Rust.rs失败

我的

src/

文件夹中有三个文件：

main.rs

、

lib.rs

和

cfgtools.rs

。我想导入

cfgtools.rs

main.rs

extern crate cfgtools;

use cfgtools::*;

fn main() {
    let os = get_os();
    println!("Your OS: {}",os);
}

pub mod cfgtools;

pub fn get_os() -> &'static str {
        let mut sys:&'static str = "unknown";
        if cfg!(target_os = "windows")   { sys = "windows" };
        if cfg!(target_os = "macos")     { sys = "macos" };
        if cfg!(target_os = "ios")       { sys = "ios" };
        if cfg!(target_os = "linux")     { sys = "linux" };
        if cfg!(target_os = "android")   { sys = "android" };
        if cfg!(target_os = "freebsd")   { sys = "freebsd" };
        if cfg!(target_os = "dragonfly") { sys = "dragonfly" };
        if cfg!(target_os = "bitrig")    { sys = "bitrig" };
        if cfg!(target_os = "openbsd")   { sys = "openbsd" };
        if cfg!(target_os = "netbsd")    { sys = "netbsd" };
        return sys;
}

lib.rs

extern crate cfgtools;

use cfgtools::*;

fn main() {
    let os = get_os();
    println!("Your OS: {}",os);
}

pub mod cfgtools;

pub fn get_os() -> &'static str {
        let mut sys:&'static str = "unknown";
        if cfg!(target_os = "windows")   { sys = "windows" };
        if cfg!(target_os = "macos")     { sys = "macos" };
        if cfg!(target_os = "ios")       { sys = "ios" };
        if cfg!(target_os = "linux")     { sys = "linux" };
        if cfg!(target_os = "android")   { sys = "android" };
        if cfg!(target_os = "freebsd")   { sys = "freebsd" };
        if cfg!(target_os = "dragonfly") { sys = "dragonfly" };
        if cfg!(target_os = "bitrig")    { sys = "bitrig" };
        if cfg!(target_os = "openbsd")   { sys = "openbsd" };
        if cfg!(target_os = "netbsd")    { sys = "netbsd" };
        return sys;
}

cfgtools.rs

extern crate cfgtools;

use cfgtools::*;

fn main() {
    let os = get_os();
    println!("Your OS: {}",os);
}

pub mod cfgtools;

pub fn get_os() -> &'static str {
        let mut sys:&'static str = "unknown";
        if cfg!(target_os = "windows")   { sys = "windows" };
        if cfg!(target_os = "macos")     { sys = "macos" };
        if cfg!(target_os = "ios")       { sys = "ios" };
        if cfg!(target_os = "linux")     { sys = "linux" };
        if cfg!(target_os = "android")   { sys = "android" };
        if cfg!(target_os = "freebsd")   { sys = "freebsd" };
        if cfg!(target_os = "dragonfly") { sys = "dragonfly" };
        if cfg!(target_os = "bitrig")    { sys = "bitrig" };
        if cfg!(target_os = "openbsd")   { sys = "openbsd" };
        if cfg!(target_os = "netbsd")    { sys = "netbsd" };
        return sys;
}

尽管如此，我还是得到了一个错误：

编译系统记录v0.1.0(file:///home/sessho/rust/sys_recog)
错误[E0463]：找不到“cfgtools”的板条箱`
-->main.rs:17:1
|
17 |外部板条箱cfgtools；
|^^^^^^^^^^^^^^^^^^^^^^^^^^^找不到板条箱

---

我不熟悉锈菌和这种进口概念。

这里的问题是板条箱和模块之间存在一些混淆。所有源文件都是同一机箱中的模块。听起来好像不需要

lib.rs

，您只需要一个

cfgtools

模块<代码>外部板条箱用于导入单独保存的其他库；外部板条箱也需要在

Cargo.toml

中声明，以便货物能够找到它们

所以应该是这样的：

main.rs

：

// Declare the module, which will be there as cfgtools.rs in the same directory.
mod cfgtools;

// Make things in cfgtools visible.  Note that wildcard imports
// aren't recommended as they can make it confusing to find where
// things actually come from.
use cfgtools::foo;

// and use it:
fn main() {
    foo();
}

// Note pub to make it visible outside the module
pub fn foo() {
    println!("Hello, world!");
}

和

cfgtools.rs

：

// Declare the module, which will be there as cfgtools.rs in the same directory.
mod cfgtools;

// Make things in cfgtools visible.  Note that wildcard imports
// aren't recommended as they can make it confusing to find where
// things actually come from.
use cfgtools::foo;

// and use it:
fn main() {
    foo();
}

// Note pub to make it visible outside the module
pub fn foo() {
    println!("Hello, world!");
}

---

我将这些文件放在

src/

的

cargo init--bin之后。

创建一个新的空白板条箱，然后

cargo run

打印出消息。

这里的问题是板条箱和模块之间存在一些混淆。所有源文件都是同一机箱中的模块。听起来好像不需要

lib.rs

，您只需要一个

cfgtools

模块<代码>外部板条箱用于导入单独保存的其他库；外部板条箱也需要在

Cargo.toml

中声明，以便货物能够找到它们

所以应该是这样的：

main.rs

：

// Declare the module, which will be there as cfgtools.rs in the same directory.
mod cfgtools;

// Make things in cfgtools visible.  Note that wildcard imports
// aren't recommended as they can make it confusing to find where
// things actually come from.
use cfgtools::foo;

// and use it:
fn main() {
    foo();
}

// Note pub to make it visible outside the module
pub fn foo() {
    println!("Hello, world!");
}

和

cfgtools.rs

：

// Declare the module, which will be there as cfgtools.rs in the same directory.
mod cfgtools;

// Make things in cfgtools visible.  Note that wildcard imports
// aren't recommended as they can make it confusing to find where
// things actually come from.
use cfgtools::foo;

// and use it:
fn main() {
    foo();
}

// Note pub to make it visible outside the module
pub fn foo() {
    println!("Hello, world!");
}

---

我将这些文件放在

src/

的

cargo init--bin之后。

创建一个新的空白板条箱，然后

cargo run

打印消息。

如何编译？您在终端中执行什么命令？它只是

货物构建

。您可以编辑您的问题以包括您的

货物。toml

然后？：）（PS:StackOverflow pro提示：如果你想通知某人，最好在评论中写上@UserName！）@LukasKalbertodt没关系，已经解决了如何编译？您在终端中执行什么命令？它只是

货物构建

。您可以编辑您的问题以包括您的

货物。toml

然后？：）（PS:StackOverflow pro提示：如果你想通知某人，最好在评论中写上@UserName！）@LukasKalbertodt没关系，已经解决了