File: issue-58888.rs

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rustc 1.86.0%2Bdfsg1-1
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//@ run-pass
//@ compile-flags: -g

#![feature(coroutines, coroutine_trait)]

use std::ops::Coroutine;

struct Database;

impl Database {
    fn get_connection(&self) -> impl Iterator<Item = ()> {
        Some(()).into_iter()
    }

    fn check_connection(&self) -> impl Coroutine<Yield = (), Return = ()> + '_ {
        #[coroutine]
        move || {
            let iter = self.get_connection();
            for i in iter {
                yield i
            }
        }
    }
}

fn main() {
    let _ = Database.check_connection();
}