Matthias Krüger 90c3e9a2c2
Rollup merge of #91645 - ibraheemdev:future-join, r=joshtriplett
Implement `core::future::join!`

`join!` polls multiple futures concurrently and returns their outputs.

```rust
async fn run() {
    let (a, b) = join!(async { 0 }, async { 1 });
}
```

cc `@rust-lang/wg-async-foundations`
2021-12-09 05:02:22 +01:00
..