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// edition:2018 // check-pass mod windows { pub trait WinFoo { fn foo(&self) {} } impl WinFoo for () {} } #[cfg(any(windows, doc))] use windows::*; mod unix { pub trait UnixFoo { fn foo(&self) {} } impl UnixFoo for () {} } #[cfg(any(unix, doc))] use unix::*; async fn bar() { ().foo() }