//@ revisions: e2021 e2024
//@[e2021] edition: 2021
//@[e2021] run-rustfix
//@[e2024] edition: 2024
//@[e2024] compile-flags: -Zunstable-options
//@[e2024] check-pass

#![deny(rust_2024_prelude_collisions)]
trait Meow {
    fn into_future(&self) {}
}
impl Meow for Cat {}

struct Cat;

fn main() {
    // This is a false positive, but it should be rare enough to not matter, and checking whether
    // it implements the trait can have other nontrivial consequences, so it was decided to accept
    // this.
    Cat.into_future();
    //[e2021]~^ ERROR trait method `into_future` will become ambiguous in Rust 2024
    //[e2021]~| WARN this is accepted in the current edition (Rust 2021) but is a hard error in Rust 2024!
}