Rust by Example

Crates

The crate_type attribute can be used to tell the compiler whether a crate is a binary or a library (and even which type of library), and the crate_name attribute can be used to set the name of the crate.

However, it is important to note that both the crate_type and crate_name attributes have no effect whatsoever when using Cargo, the Rust package manager. Since Cargo is used for the majority of Rust projects, this means real-world uses of crate_type and crate_name are relatively limited.

// This crate is a library

#![crate_type = "lib"]

// The library is named "rary"

#![crate_name = "rary"]

pub fn public_function() {

println!("called rary's `public_function()`");

}

fn private_function() {

println!("called rary's `private_function()`");

}

pub fn indirect_access() {

print!("called rary's `indirect_access()`, that\n> ");

private_function();

}

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When the crate_type attribute is used, we no longer need to pass the --crate-type flag to rustc.

$ rustc lib.rs

$ ls lib*

library.rlib