rust/tests/ui/unused-crate-deps/use_extern_crate_2015.rs

// Suppress by using crate

// edition:2015
// check-pass
// aux-crate:bar=bar.rs

#![warn(unused_crate_dependencies)]

extern crate bar;

fn main() {
    println!("bar {}", bar::BAR);
}
Implement warning for unused dependencies. This will print a diagnostic for crates which are mentioned as `--extern` arguments on the command line, but are never referenced from the source. This diagnostic is controlled by `-Wunused-crate-dependencies` or `#![warn(unused_crate_dependencies)]` and is "allow" by default. There are cases where certain crates need to be linked in but are not directly referenced - for example if they are providing symbols for C linkage. In this case the warning can be suppressed with `use needed_crate as _;`. Thanks to @petrochenkov for simplified core. Resolves issue #57274 2020-05-17 08:48:01 +00:00			`// Suppress by using crate`

			`// edition:2015`
			`// check-pass`
			`// aux-crate:bar=bar.rs`

			`#![warn(unused_crate_dependencies)]`

			`extern crate bar;`

			`fn main() {`
			`println!("bar {}", bar::BAR);`
			`}`