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.
// lib.rs
// This crate is a library
#![crate_type = "lib"]
// The library is named "erty"
#![crate_name = "erty"]
pub fn public_function() {
println!("called erty's `public_function()`");
}
fn private_function() {
println!("called erty's `private_function()`");
}
pub fn indirect_access() {
print!("called erty's `indirect_access()`, that\n> ");
private_function();
}
When the crate_type attribute is used, we no longer need to pass the
--crate-type flag to rustc.
$ rustc lib.rs
$ ls lib*
liberty.rlib