如何在Rust 2018中习惯性地使用板条箱别名? [英] How to idiomatically alias a crate in Rust 2018?

问题描述

我有一个板条箱foo_sys.在Rust 2015中，为了方便起见，我使用extern crate foo_sys as foo，但是在Rust 2018中，不再需要extern crate，我不想仅将其用于别名.放下extern crate时，我得到

I have a crate foo_sys. In Rust 2015 I used extern crate foo_sys as foo for convenience, but in Rust 2018 extern crate isn't needed anymore and I don't want to use it only for aliasing. When dropping extern crate, I get

错误 [E0463] :找不到foo

推荐答案

这可以通过

This can be achieved with the rename-dependency Cargo feature, available in Rust 1.31. With this feature, it's possible to provide a package attribute to the dependencies:

重命名依赖项功能允许您导入名称与源名称不同的依赖项.在某些情况下这可能很有用:

The rename-dependency feature allows you to import a dependency with a different name from the source. This can be useful in a few scenarios:

• 取决于来自不同注册表的同名箱子.
• 取决于板条箱的多个版本.
• 避免在Rust源中使用extern crate foo as bar.

代替写作

[dependencies]
foo_sys = "0.2"

package键可以添加到Cargo.toml中的依赖项:

the package key can be added to the dependency in Cargo.toml:

[dependencies]
foo = { package = "foo_sys", version = "0.2" }

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