rust/tests/ui/proc-macro/no-macro-use-attr.rs

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// aux-build:test-macros.rs
#![feature(rustc_attrs)]
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#![warn(unused_extern_crates)]
extern crate test_macros;
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//~^ WARN unused extern crate
#[rustc_error]
fn main() {} //~ ERROR fatal error triggered by #[rustc_error]