rust - 如何更好地理解 Rust 中的 Crate？

Question

在本书中- Rust By Example ,第 11 章:

A crate is a compilation unit in Rust. Whenever rustc some_file.rs is called, some_file.rs is treated as the crate file.

按照这本书，源文件呢？

The Rust Reference | Crates and source files

The compilation model centers on artifacts called crates. Each compilation processes a single crate in source form, and if successful, produces a single crate in binary form: either an executable or some sort of library.

The Rust compiler is always invoked with a single source file as input, and always produces a single output crate. The processing of that source file may result in other source files being loaded as modules. Source files have the extension .rs.

根据这个说法，我认为:

Source file(.rs file) --> corresponding crate

Just like : .java --> .class

现在我无法理解这个问题；我都在海上。

Answer 1

这是您引用的 Material 的关键部分:

The processing of that source file may result in other source files being loaded as modules.

如果您检查一个典型的库，您会发现一个名为 src/lib.rs 的文件，其中包含几行，例如 mod foo;。每一个都标识另一个文件 src/foo.rs ，编译器会将其解释为另一个模块，构成 crate 的一部分(或者它可以直接包含模块，在同一个文件中)。

并不是一个源文件组成一个 crate:从那个源文件开始，您可以找到构成 crate 的所有文件，这与其他编译模型不同编译器可能会给出许多文件名作为开头。