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Tweak errors coming from `for`-loop, `?` and `.await` desugaring by estebank · P...

 2 years ago
source link: https://github.com/rust-lang/rust/pull/90939
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estebank commented on Nov 16, 2021 •

edited
  • Suggest removal of .await on non-Future expression
  • Keep track of obligations introduced by desugaring
  • Remove span pointing at method for obligation errors coming from desugaring
  • Point at called local sync fn and suggest making it async
error[E0277]: `()` is not a future
  --> $DIR/unnecessary-await.rs:9:10
   |
LL |     boo().await;
   |     -----^^^^^^ `()` is not a future
   |     |
   |     this call returns `()`
   |
   = help: the trait `Future` is not implemented for `()`
help: do not `.await` the expression
   |
LL -     boo().await;
LL +     boo();
   | 
help: alternatively, consider making `fn boo` asynchronous
   |
LL | async fn boo () {}
   | +++++

Fix #66731.


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