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 extern crate `bar` is 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 16:48:01 +08:00			`// Check for unused crate dep, no path`

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

			`fn main() {}`
Spruce up the diagnostics of some early lints 2024-06-03 13:17:19 +08:00			//~^ WARNING extern crate `bar` is unused in