Check for loops/closures in `local_used_after_expr`
Follow up to #8646, catches when a local is used multiple times because it's in a loop or a closure
changelog: none
errors: lazily load fallback fluent bundle
Addresses (hopefully) https://github.com/rust-lang/rust/pull/95667#issuecomment-1094794087.
Loading the fallback bundle in compilation sessions that won't go on to emit any errors unnecessarily degrades compile time performance, so lazily create the Fluent bundle when it is first required.
r? `@ghost` (just for perf initially)
Use mir constant in thir instead of ty::Const
This is blocked on https://github.com/rust-lang/rust/pull/94059 (does include its changes, the first two commits in this PR correspond to those changes) and https://github.com/rust-lang/rust/pull/93800 being reinstated (which had to be reverted). Mainly opening since `@lcnr` offered to give some feedback and maybe also for a perf-run (if necessary).
This currently contains a lot of duplication since some of the logic of `ty::Const` had to be copied to `mir::ConstantKind`, but with the introduction of valtrees a lot of that functionality will disappear from `ty::Const`.
Only the last commit contains changes that need to be reviewed here. Did leave some `FIXME` comments regarding future implementation decisions and some things that might be incorrectly implemented.
r? `@oli-obk`
Loading the fallback bundle in compilation sessions that won't go on to
emit any errors unnecessarily degrades compile time performance, so
lazily create the Fluent bundle when it is first required.
Signed-off-by: David Wood <david.wood@huawei.com>
fix unnecessary_to_owned about msrv
This PR fixes ``[`unnecessary_owned`]``.
## What
```rust
# sample code
fn _msrv_1_35() {
#![clippy::msrv = "1.35"]
let _ = &["x"][..].to_vec().into_iter();
}
fn _msrv_1_36() {
#![clippy::msrv = "1.36"]
let _ = &["x"][..].to_vec().into_iter();
}
```
If we will check this code using clippy, ``[`unnecessary_owned`]`` will modify the code as follows.
```rust
error: unnecessary use of `to_vec`
--> $DIR/unnecessary_to_owned.rs:219:14
|
LL | let _ = &["x"][..].to_vec().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()`
error: unnecessary use of `to_vec`
--> $DIR/unnecessary_to_owned.rs:224:14
|
LL | let _ = &["x"][..].to_vec().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `["x"][..].iter().copied()`
```
This is incorrect. Because `Iterator::copied` was estabilished in 1.36.
## Why
This bug was caused by not separating "copied" and "clone" by reference to msrv.
89ee6aa6e3/clippy_lints/src/methods/unnecessary_to_owned.rs (L195)
So, I added a conditional branch and described the corresponding test.
Thank you in advance.
changelog: fix wrong suggestions about msrv in [`unnecessary_to_owned`]
r! `@giraffate`
Don't lint `manual_non_exhaustive` when the enum variant is used
fixes#5714
changelog: Don't lint `manual_non_exhaustive` when the enum variant is used
Do not trigger ``[`rest_pat_in_fully_bound_structs`]`` on `#[non_exhaustive]` structs
fixes#8029
Just adds an additional check to ensure that the`ty::VariantDef` is not marked as `#[non_exhaustive]`.
changelog: Do not apply ``[`rest_pat_in_fully_bound_structs`]`` on structs marked as non exhaustive.
Prevent infinite (exponential) recursion in only_used_in_recursion
This simplifies the visitor code a bit and prevents checking expressions
multiple times. I still think this lint should be removed for now,
because its code isn't really tested.
Fixes#8689
**NOTE:** Before merging this, we should talk about removing and revisiting this lint. See my comment in #8689
changelog: prevent infinite recursion in [`only_used_in_recursion`]
This simplifies the visitor code a bit and prevents checking expressions
multiple times. I still think this lint should be removed for now,
because its code isn't really tested.
adding condition for map_clone message
This PR fixes the message about `map_clone`.
if msrv >= 1.36, the message is correct.
```bash
$ cat main.rs
fn main() {
let x: Vec<&i32> = vec![&1, &2];
let y: Vec<_> = x.iter().map(|i| *i).collect();
println!("{:?}", y);
}
$ cargo clippy
warning: you are using an explicit closure for copying elements
--> main.rs:3:20
|
3 | let y: Vec<_> = x.iter().map(|i| *i).collect();
| ^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `copied` method: `x.iter().copied()`
|
= note: `#[warn(clippy::map_clone)]` on by default
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
warning: `test` (build script) generated 1 warning
warning: `test` (bin "test") generated 1 warning (1 duplicate)
Finished dev [unoptimized + debuginfo] target(s) in 0.00s
```
but, if msrv < 1.36, the suggestion is `cloned`, but the message is `copying`.
```bash
$ cat clippy.toml
msrv = "1.35"
$ cargo clippy
warning: you are using an explicit closure for copying elements
--> main.rs:3:20
|
3 | let y: Vec<_> = x.iter().map(|i| *i).collect();
| ^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `cloned` method: `x.iter().cloned()`
```
I think the separation of messages will make it more user-friendly.
thank you in advance.
changelog: Fixed a message in map_clone.
New lint `is_digit_ascii_radix`
Closes#6399
changelog: Added [`is_digit_ascii_radix`]: recommend `is_ascii_digit()` or `is_ascii_hexdigit()` in place of `is_digit(10)` and `is_digit(16)`
Fix subtraction overflow in `cast_possible_truncation`
changelog: Fix false negative due to subtraction overflow in `cast_possible_truncation`
I *think* a false negative is the worst that can happen from this
Don't lint various match lints when expanded by a proc-macro
fixes#4952
As always for proc-macro output this is a hack-job of a fix. It would be really nice if more proc-macro authors would set spans correctly.
changelog: Don't lint various lints on proc-macro output.
Remove overlap between `manual_split_once` and `needless_splitn`
changelog: Remove overlap between [`manual_split_once`] and [`needless_splitn`]. Fixes some incorrect `rsplitn` suggestions for [`manual_split_once`]
Things that can trigger `needless_splitn` no longer trigger `manual_split_once`, e.g.
```rust
s.[r]splitn(2, '=').next();
s.[r]splitn(2, '=').nth(0);
s.[r]splitn(3, '=').next_tuple();
```
Fixes some suggestions:
```rust
let s = "should not match";
s.rsplitn(2, '.').nth(1);
// old -> Some("should not match")
Some(s.rsplit_once('.').map_or(s, |x| x.0));
// new -> None
s.rsplit_once('.').map(|x| x.0);
s.rsplitn(2, '.').nth(1)?;
// old -> "should not match"
s.rsplit_once('.').map_or(s, |x| x.0);
// new -> early returns
s.rsplit_once('.')?.0;
```
Cached stable hash cleanups
r? `@nnethercote`
Add a sanity assertion in debug mode to check that the cached hashes are actually the ones we get if we compute the hash each time.
Add a new data structure that bundles all the hash-caching work to make it easier to re-use it for different interned data structures
- Create hir_crate_items query which traverses tcx.hir_crate(()).owners to return a hir::ModuleItems
- use tcx.hir_crate_items in tcx.hir().items() to return an iterator of hir::ItemId
- add par_items(impl Fn(hir::ItemId)) to traverse all items in parallel
Signed-off-by: Miguel Guarniz <mi9uel9@gmail.com>
ignore `&x | &y` in unnested_or_patterns
replacing it with `&(x | y)` is actually more characters
Fixes#6973
changelog: [`unnested_or_patterns`] ignore `&x | &y`, nesting would result in more characters
Add a lint to detect cast to unsigned for abs() and suggest unsigned_…
…abs()
changelog: Add a [`cast_abs_to_unsigned`] that checks for uses of `abs()` that are cast to the corresponding unsigned integer type and suggest to replace them with `unsigned_abs()`.
Fix `as_deref_mut` false positives in `needless_option_as_deref`
Also moves it into `methods/`
Fixes#7846Fixes#8047
changelog: [`needless_option_as_deref`]: No longer lints for `as_deref_mut` on Options that cannot be moved
supersedes #8064
fix FP in lint `[needless_match]`
fixes: #8542fixes: #8551fixes: #8595fixes: #8599
---
changelog: check for more complex custom type, and ignore type coercion in [`needless_match`]
Suggest from_utf8_unchecked in const contexts
Unfortunately I couldn't figure out how to check whether a given expression is in an `unsafe` context or not, so I just unconditionally emit the wrapping `unsafe {}` block in the suggestion. If there is an easy way to get it to work better then I would love to hear it.
changelog: Suggest `from_utf8_unchecked` instead of `from_utf8` in const contexts for ``[`transmute_bytes_to_str`]``
refs: #8379
Fix unnecessary_cast suggestion for type aliasses
Fix#6923. The [`unnecessary_cast`] lint now will skip casting to non-primitive type.
changelog: fix lint [`unnecessary_cast `]
`indexing_slicing` should not fire if a valid array index comes from a constant function that is evaluated at compile-time
fix#8348
changelog: [`indexing_slicing`] fewer false positives in `const` contexts and with `const` indices
Add an option for enabling and disabling Fluent's directionality
isolation markers in output. Disabled by default as these can render in
some terminals and applications.
Signed-off-by: David Wood <david.wood@huawei.com>
Extend loading of Fluent bundles so that bundles can be loaded from the
sysroot based on the language requested by the user, or using a nightly
flag.
Sysroot bundles are loaded from `$sysroot/share/locale/$locale/*.ftl`.
Signed-off-by: David Wood <david.wood@huawei.com>
This commit updates the signatures of all diagnostic functions to accept
types that can be converted into a `DiagnosticMessage`. This enables
existing diagnostic calls to continue to work as before and Fluent
identifiers to be provided. The `SessionDiagnostic` derive just
generates normal diagnostic calls, so these APIs had to be modified to
accept Fluent identifiers.
In addition, loading of the "fallback" Fluent bundle, which contains the
built-in English messages, has been implemented.
Each diagnostic now has "arguments" which correspond to variables in the
Fluent messages (necessary to render a Fluent message) but no API for
adding arguments has been added yet. Therefore, diagnostics (that do not
require interpolation) can be converted to use Fluent identifiers and
will be output as before.
`MultiSpan` contains labels, which are more complicated with the
introduction of diagnostic translation and will use types from
`rustc_errors` - however, `rustc_errors` depends on `rustc_span` so
`rustc_span` cannot use types like `DiagnosticMessage` without
dependency cycles. Introduce a new `rustc_error_messages` crate that can
contain `DiagnosticMessage` and `MultiSpan`.
Signed-off-by: David Wood <david.wood@huawei.com>
Rework `undocumented_unsafe_blocks`
fixes: #8264fixes: #8449
One thing came up while working on this. Currently comments on the same line are supported like so:
```rust
/* SAFETY: reason */ unsafe {}
```
Is this worth supporting at all? Anything other than a couple of words doesn't really fit well.
edit: [zulip topic](https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/.60undocumented_unsafe_blocks.60.20same.20line.20comment)
changelog: Don't lint `undocumented_unsafe_blocks` when the unsafe block comes from a proc-macro.
changelog: Don't lint `undocumented_unsafe_blocks` when the preceding line has a safety comment and the unsafe block is a sub-expression.
add `empty_structs_with_brackets`
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Closes#8591
I'm already sorry for the massive diff 😅
changelog: New lint [`empty_structs_with_brackets`]
Handle relative paths in module_files lints
The problem being that when clippy is run in the project's directory `lp` would be a relative path, this wasn't caught by the tests as there `lp` is an absolute path. Being a relative path it did not start with `trim_src_path` and so was ignored
Also allowed the removal of some `.to_os_string`/`.to_owned`s
changelog: Fixes [`self_named_module_files`] and [`mod_module_files`] not linting
Fixes#8123, cc `@DevinR528`
single_element_loop: handle arrays for Edition2021
changelog: [`single_element_loop`] handle arrays in Edition 2021, handle `.iter_mut()` and `.into_iter()`, and wrap in parens if necessary
Rollup of 6 pull requests
Successful merges:
- #93901 (Stabilize native library modifier syntax and the `whole-archive` modifier specifically)
- #94806 (Fix `cargo run tidy`)
- #94869 (Add the generic_associated_types_extended feature)
- #95011 (async: Give predictable name to binding generated from .await expressions.)
- #95251 (Reduce max hash in raw strings from u16 to u8)
- #95298 (Fix double drop of allocator in IntoIter impl of Vec)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Remember mutability in `DefKind::Static`.
This allows to compute the `BodyOwnerKind` from `DefKind` only, and
removes a direct dependency of some MIR queries onto HIR.
As a side effect, it also simplifies metadata, since we don't need 4
flavours of `EntryKind::*Static` any more.
Add `crate_in_macro_def` lint
This PR adds a lint to check for `crate` as opposed to `$crate` used in a macro definition.
I think this can close#4798. That issue focused on the case where the macro author "imports something into said macro."
But I think use of `crate` is likely to be a bug whether it appears in a `use` statement or not. There could be some use case I am failing to see, though. (cc: `@nilscript` `@flip1995)`
changelog: `crate_in_macro_def`
This allows to compute the `BodyOwnerKind` from `DefKind` only, and
removes a direct dependency of some MIR queries onto HIR.
As a side effect, it also simplifies metadata, since we don't need 4
flavours of `EntryKind::*Static` any more.
