// https://github.com/rust-lang/rust/issues/93828 use async_trait::async_trait; pub trait IntoUrl {} #[async_trait] pub trait ClientExt { async fn publish(&self, url: T); } struct Client; #[async_trait] impl ClientExt for Client { async fn publish(&self, url: T) {} } struct Client2; #[async_trait] impl ClientExt for Client2 { async fn publish(&self, url: T) {} } fn main() {}