src/test/ui-fulldeps/proc-macro/edition-imports-2018.rs

// compile-pass
// edition:2018
// aux-build:edition-imports-2015.rs

#[macro_use]
extern crate edition_imports_2015;

mod import {
    pub struct Path;
}
mod absolute {
    pub struct Path;
}

mod check {
    #[derive(Derive2015)] // OK
    struct S;

    fn check() {
        Path;
    }
}

fn main() {}