On outer attr not found, avoid knock-down errors #118511
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r? @TaKO8Ki (rustbot has picked a reviewer for you, use r? to override) |
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Dec 3, 2023
When we encounter code like
```rust
struct S;
fn main() {
S.clone();
}
```
we avoid emitting errors about the `derive` (which isn't early resolved
as normal, but *has* a later resolution) and stop the compiler from
advancing to later stages, to avoid knock down errors from the `derive`
not being evaluated. Recovering these would be possible, but would
produce incorrect errors in the cases where had the outer attribute been
present it would have modified the behavior/evaluation of the `derive`
attributes.
Fix rust-lang#118455.
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@bors r=TaKO8Ki |
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can we hold on this PR since it will conflict with #118533 My PR may suppress more these kinds of errors by checking builtin macros and attrs. Let's wait for @petrochenkov 's comments. |
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@chenyukang Ok. I will cancel my approval temporarily. @bors r- |
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☔ The latest upstream changes (presumably #119751) made this pull request unmergeable. Please resolve the merge conflicts. |
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Closing in favor of #118533. |
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When we encounter code like
we avoid emitting errors about the
derive(which isn't early resolved as normal, but has a later resolution) and stop the compiler from advancing to later stages, to avoid knock down errors from thederivenot being evaluated. Recovering these would be possible, but would produce incorrect errors in the cases where had the outer attribute been present it would have modified the behavior/evaluation of thederiveattributes.Furthermore, the fan-out of knock down errors caused by this case is incredibly high, easily causing thousands of errors by the introduction of a single incorrect outer attribute in the crate root.
Fix #118455.