Consider the following recursive implementation of the fibonacci numbers:
async
The compiler helpfully tells us that:
error[E0733]: recursion in an `async fn` requires boxing
--> src/main.rs:1:26
|
1 | async fn fib(n : u32) -> u64 {
| ^^^ recursive `async fn`
|
= note: a recursive `async fn` must be rewritten to return a boxed `dyn Future`.
This crate provides an attribute macro to automatically convert an async recursive function to one returning a boxed Future.
Example
use async_recursion;
async
Limitations
Currently the macro doesn't consider lifetimes at all; this is something I plan to work on in the future.
License
Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.