Remove confusing 'while checking' note from opaque future type mismatches #107201
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I'm not entirely convinced that removing the span is an unambiguous improvement, but the current output isn't great either. |
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@estebank - I agree, but I think the current wording is bordering on actively confusing. I'm open to suggestions for a wording, but getting it to fit into the existing machinery might be hard. |
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I can't further review this now, but I think r=me. |
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@bors r=estebank rollup |
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🌲 The tree is currently closed for pull requests below priority 50. This pull request will be tested once the tree is reopened. |
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…-note, r=estebank
Remove confusing 'while checking' note from opaque future type mismatches
Maybe I'm just misinterpreting the wording of the note. The only value I can see in this note is that it points out where the async's opaque future is coming from, but the way it's doing it is misleading IMO.
For example:
```rust
note: while checking the return type of the `async fn`
--> $DIR/dont-suggest-missing-await.rs:7:24
|
LL | async fn make_u32() -> u32 {
| ^^^ checked the `Output` of this `async fn`, found opaque type
```
We point at the type `u32` in the HIR, but then say "found opaque type". We also say "while checking"... but we're typechecking a totally different function when we get this type mismatch!
r? `@estebank` but feel free to reassign and/or take your time reviewing this. I'd be inclined to also discuss reworking the presentation of this type mismatch to restore some of these labels in a way that makes it more clear what it's trying to point out.
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…iaskrgr Rollup of 5 pull requests Successful merges: - rust-lang#107201 (Remove confusing 'while checking' note from opaque future type mismatches) - rust-lang#107312 (Add Style Guide rules for let-else statements) - rust-lang#107488 (Fix syntax in `-Zunpretty-expanded` output for derived `PartialEq`.) - rust-lang#107531 (Inline CSS background images directly into the CSS) - rust-lang#107576 (Add proc-macro boilerplate to crt-static test) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Maybe I'm just misinterpreting the wording of the note. The only value I can see in this note is that it points out where the async's opaque future is coming from, but the way it's doing it is misleading IMO.
For example:
We point at the type
u32in the HIR, but then say "found opaque type". We also say "while checking"... but we're typechecking a totally different function when we get this type mismatch!r? @estebank but feel free to reassign and/or take your time reviewing this. I'd be inclined to also discuss reworking the presentation of this type mismatch to restore some of these labels in a way that makes it more clear what it's trying to point out.