rust/tests/ui/unused-crate-deps/warn-cmdline.rs

// Check for unused crate dep, no path

// edition:2018
// check-pass
// compile-flags: -Wunused-crate-dependencies
// aux-crate:bar=bar.rs

fn main() {}
//~^ WARNING external crate `bar` unused in
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 03:48:01 -05:00			`// Check for unused crate dep, no path`

			`// edition:2018`
			`// check-pass`
			`// compile-flags: -Wunused-crate-dependencies`
			`// aux-crate:bar=bar.rs`

			`fn main() {}`
			//~^ WARNING external crate `bar` unused in