error[E0733]: recursion in an `async fn` requires boxing --> $DIR/async-recursive-generic.rs:11:48 | LL | async fn foo_recursive(&self, n: usize) -> T { | ^ recursive `async fn` | = note: a recursive `async fn` must be rewritten to return a boxed `dyn Future` = note: consider using the `async_recursion` crate: https://crates.io/crates/async_recursion error: aborting due to previous error For more information about this error, try `rustc --explain E0733`.