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90c3e9a2c2
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`
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| alloc | ||
| backtrace@b02ed04a7e | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@cfba59fccd | ||
| test | ||
| unwind | ||