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When originally added, this test used to contain a `#![plugin(clippy)]`. This was removed at some point along the way, at which point this test no longer tests anything. It prints: warning: unknown lint: `identity_op` --> src/main.rs:1:9 | 1 | #![deny(identity_op)] | ^^^^^^^^^^^ | = note: #[warn(unknown_lints)] on by default which is swallowed and ignored by compiletest. Nowadays Clippy handles warnings inside of macro expanded code intelligently and this is something they would be responsible for testing.