Add new lint `iter_not_returning_iterator`
Add new lint [`iter_not_returning_iterator`] to detect method `iter()` or `iter_mut()` returning a type not implementing `Iterator`
changelog: Add new lint [`iter_not_returning_iterator`]
Allow giving reasons for `disallowed_methods`
Fixes#7609.
This permits writing the config for `disallowed-methods` as either a list of strings (like before) or a list of tables, where each table gives the path to the disallowed method and an optional reason for why the method is disallowed.
changelog: Allow giving reasons for [`disallowed_methods`]
`mut_range_bound` check for immediate break after mutation
closes#7532
`mut_range_bound` ignores mutation on range bounds that is placed immediately before break. Still warns if the break is not always reachable.
changelog: [`mut_range_bound`] ignore range bound mutations before immediate break
Avoid slice indexing in Clippy (down with the ICEs)
While working on #7569 I got about 23 lint reports where we can avoid slice indexing by destructing the slice early. This is a preparation PR to avoid fixing them in the lint PR. (The implementation already takes about 300 lines without tests 😅). Either way, this should hopefully be easy to review 🙃
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changelog: none
Provide `layout_of` automatically (given tcx + param_env + error handling).
After #88337, there's no longer any uses of `LayoutOf` within `rustc_target` itself, so I realized I could move the trait to `rustc_middle::ty::layout` and redesign it a bit.
This is similar to #88338 (and supersedes it), but at no ergonomic loss, since there's no funky `C: LayoutOf<Ty = Ty>` -> `Ty: TyAbiInterface<C>` generic `impl` chain, and each `LayoutOf` still corresponds to one `impl` (of `LayoutOfHelpers`) for the specific context.
After this PR, this is what's needed to get `trait LayoutOf` (with the `layout_of` method) implemented on some context type:
* `TyCtxt`, via `HasTyCtxt`
* `ParamEnv`, via `HasParamEnv`
* a way to transform `LayoutError`s into the desired error type
* an error type of `!` can be paired with having `cx.layout_of(...)` return `TyAndLayout` *without* `Result<...>` around it, such as used by codegen
* this is done through a new `LayoutOfHelpers` trait (and so is specifying the type of `cx.layout_of(...)`)
When going through this path (and not bypassing it with a manual `impl` of `LayoutOf`), the end result is that only the error case can be customized, the query itself and the success paths are guaranteed to be uniform.
(**EDIT**: just noticed that because of the supertrait relationship, you cannot actually implement `LayoutOf` yourself, the blanket `impl` fully covers all possible context types that could ever implement it)
Part of the motivation for this shape of API is that I've been working on querifying `FnAbi::of_*`, and what I want/need to introduce for that looks a lot like the setup in this PR - in particular, it's harder to express the `FnAbi` methods in `rustc_target`, since they're much more tied to `rustc` concepts.
r? `@nagisa` cc `@oli-obk` `@bjorn3`
Updating issue templates again for rustbot
It turns out that our current issue template can sometimes trigger a rustbot error message, as can be seen in [#7626](https://github.com/rust-lang/rust-clippy/issues/7626). I originally tested this in #7599, but it's apparently a bit inconsistent. This PR adds backticks to the commands, as correctly suggested by `@mikerite` in the comments. (Thank you!)
``@rustbot` label +S-blocked`
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Now I also pushed a tiny link fix as well. 🙃
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changelog: none
Extend unnecessary_unwrap to look for expect in addition to unwrap
changelog: Extend ``[`unnecessary_unwrap`]`` to also check for `Option::expect` and `Result::expect`. Also give code suggestions in some cases.
Fixes#7581
