Jacob Pratt
1e6df58e77
Rollup merge of #140794 - karolzwolak:allow-unused-doc-65464, r=davidtwco
...
mention lint group in default level lint note
### Summary
This PR updates lint diagnostics so that default-level notes now mention the lint group they belong to, if any.
Fixes : rust-lang/rust#65464 .
### Example
```rust
fn main() {
let x = 5;
}
```
Before:
```
= note: `#[warn(unused_variables)]` on by default
```
After:
```
= note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
```
### Unchanged Cases
Messages remain the same when the lint level is explicitly set, e.g.:
* Attribute on the lint `#[warn(unused_variables)]`:
```
note: the lint level is defined here
LL | #[warn(unused_variables)]
| ^^^^^^^^^^^^^^^^
```
* Attribute on the group `#[warn(unused)]:`:
```
= note: `#[warn(unused_variables)]` implied by `#[warn(unused)]`
```
* CLI option `-W unused`:
```
= note: `-W unused-variables` implied by `-W unused`
= help: to override `-W unused` add `#[allow(unused_variables)]`
```
* CLI option `-W unused-variables`:
```
= note: requested on the command line with `-W unused-variables`
```
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