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Update await desugaring #674

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Oct 3, 2019
Merged

Update await desugaring #674

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13 changes: 7 additions & 6 deletions src/expressions/await-expr.md
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Original file line number Diff line number Diff line change
Expand Up @@ -52,12 +52,13 @@ Effectively, an `<expr>.await` expression is roughly
equivalent to the following (this desugaring is not normative):

```rust,ignore
let future = /* <expr> */;
loop {
let mut pin = unsafe { Pin::new_unchecked(&mut future) };
match Pin::future::poll(Pin::borrow(&mut pin), &mut current_context) {
Poll::Ready(r) => break r,
Poll::Pending => yield Poll::Pending,
match /* <expr> */ {
mut pinned => loop {
let mut pin = unsafe { Pin::new_unchecked(&mut pinned) };
match Pin::future::poll(Pin::borrow(&mut pin), &mut current_context) {
Poll::Ready(r) => break r,
Poll::Pending => yield Poll::Pending,
}
}
}
```
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