File: universal_in_trait_defn_parameters.rs

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// run-pass

use std::fmt::Debug;

trait InTraitDefnParameters {
    fn in_parameters(_: impl Debug) -> String;
}

impl InTraitDefnParameters for () {
    fn in_parameters(v: impl Debug) -> String {
        format!("() + {:?}", v)
    }
}

fn main() {
    let s = <() as InTraitDefnParameters>::in_parameters(22);
    assert_eq!(s, "() + 22");
}