Don't show no_effect warning on unit structs implementing fn_once
Fixes#7792
changelog: Don't show [`no_effect`] or [`unecessary_operation`] warning for unit struct implementing FnOnce
Fix for #7889 and add new lint needless_splitn
fixes: #7889
1. Fix the problem of manual_split_once changing the original behavior.
2. Add a new lint needless_splitn.
changelog: Fix the problem of manual_split_once changing the original behavior and add a new lint needless_splitn.
1. Fix the problem of manual_split_once changing the original behavior.
2. Add a new lint needless_splitn.
changelog: Fix the problem of manual_split_once changing the original behavior and add a new lint needless_splitn.
Fix `needless_collect`'s tendency to suggest code requiring multiple mutable borrows of the same value.
Fixes error specified in #7975.
changelog: [`needless_collect`] no longer suggests removal of `collect` when removal would create code requiring mutably borrowing a value multiple times.
1. Make the lifetime contained in LateContext `'tcx`.
2. Fix `'txc` to `'tcx` because it was a typo.
3. Refactor `IterFunctionVisitor`'s `visit_block` method to be more readable.
4. Replace uses of `rustc_middle::ty::TyKind` with `rustc::middle::ty`, and remove the `#[allow(...)]`.
(Thank you llogiq for all these suggestions!)
Improve heuristic for eagerness suggestion
Still to be done:
* a more complete list of cheap functions
* a way to limit the complexity of cheap expressions
changelog: Improve heuristics for `or_fun_call` and `unnecessary_lazy_evaluations`
Support suggestion for #7854
I think the detection of parking_lot's mutex and rwlock is valuable, so submit this pr, please help judge and review, thank you.
Make let_underscore_lock support parking_lot.(Fixes#7854)
changelog: Make let_underscore_lock support parking_lot
I think the detection of parking_lot's mutex and rwlock is valuable, so submit this pr, please help judge and review, thank you.
Make let_underscore_lock support parking_lot.
changelog: Make let_underscore_lock support parking_lot
Run rustfmt on batches of multiple files
changelog: none
This gives `cargo dev fmt` a nice speed boost, down from 90s (because old) on my laptop and 120s (because windows) on my desktop to ~5s on both
250 at a time was to give windows a good amount of headroom (failed at ~800, https://github.com/rust-lang/rust/issues/40384)
Also adds rustfmt to the toolchain file and has the clippy_dev workflow test using the pinned version as a follow up to #7963
Lint for bool to integer casts in `cast_lossless`
The lint description says
> Checks for casts between *numerical* types that may be replaced by safe conversion functions.
Which is strictly speaking being violated here, but it seems within the spirit of the lint. I think it is still a useful lint to have, and having a different lint for just this feels excessive. Thoughts?
Fixes#7947
changelog: Lint for bool to integer casts in [`cast_lossless`]
Author improvements
changelog: none
Various aspects of the author implementation are re-imagined to be much less repetitive. Also fixes some bugs. I hope this makes author more fun to work on for future contributors.
The last commit is pretty heavy but I tried to at least separate some changes so that the test file diffs per commit are simple.
New lint `index_refutable_slice` to avoid slice indexing
A new lint to check for slices that could be deconstructed to avoid indexing. This lint should hopefully prevent some panics in other projects and ICEs for us. See #7569 for an example
The implementation specifically checks for immutable bindings in `if let` statements to slices and arrays. Then it checks if these bindings are only used for value access using indices and that these indices are lower than the configured limit. I did my best to keep the implementation small, however the check was sadly quite complex. Now it's around 300 lines for the implementation and the rest are test.
---
Optional future improvements:
* Check for these instances also in `match` statements
* Check for mutable slice bindings that could also be destructed
---
changelog: New lint [`index_refutable_slice`]
I've already fixed a bunch of lint triggers in #7638 to make this PR smaller
Closes: #7569
