Update Clippy

src/tools/clippy/.github/workflows/clippy.yml

@@ -58,6 +58,10 @@ jobs:
       run: cargo test --features deny-warnings,internal-lints,metadata-collector-lint
       working-directory: clippy_lints
 
+    - name: Test clippy_utils
+      run: cargo test --features deny-warnings,internal-lints,metadata-collector-lint
+      working-directory: clippy_utils
+
     - name: Test rustc_tools_util
       run: cargo test --features deny-warnings
       working-directory: rustc_tools_util

src/tools/clippy/.github/workflows/clippy_bors.yml

@@ -121,6 +121,10 @@ jobs:
       run: cargo test --features deny-warnings,internal-lints,metadata-collector-lint
       working-directory: clippy_lints
 
+    - name: Test clippy_utils
+      run: cargo test --features deny-warnings,internal-lints,metadata-collector-lint
+      working-directory: clippy_utils
+
     - name: Test rustc_tools_util
       run: cargo test --features deny-warnings
       working-directory: rustc_tools_util

src/tools/clippy/CHANGELOG.md

@@ -6,13 +6,127 @@ document.
 
 ## Unreleased / In Rust Nightly
 
-[b7f3f7f...master](https://github.com/rust-lang/rust-clippy/compare/b7f3f7f...master)
+[e181011...master](https://github.com/rust-lang/rust-clippy/compare/e181011...master)
+
+## Rust 1.58 (beta)
+
+Current beta, release 2022-01-13
+
+[00e31fa...e181011](https://github.com/rust-lang/rust-clippy/compare/00e31fa...e181011)
+
+### New lints
+
+* [`transmute_num_to_bytes`]
+  [#7805](https://github.com/rust-lang/rust-clippy/pull/7805)
+* [`match_str_case_mismatch`]
+  [#7806](https://github.com/rust-lang/rust-clippy/pull/7806)
+* [`format_in_format_args`], [`to_string_in_format_args`]
+  [#7743](https://github.com/rust-lang/rust-clippy/pull/7743)
+* [`uninit_vec`]
+  [#7682](https://github.com/rust-lang/rust-clippy/pull/7682)
+* [`fn_to_numeric_cast_any`]
+  [#7705](https://github.com/rust-lang/rust-clippy/pull/7705)
+* [`undocumented_unsafe_blocks`]
+  [#7748](https://github.com/rust-lang/rust-clippy/pull/7748)
+* [`trailing_empty_array`]
+  [#7838](https://github.com/rust-lang/rust-clippy/pull/7838)
+* [`string_slice`]
+  [#7878](https://github.com/rust-lang/rust-clippy/pull/7878)
+
+### Moves or deprecations of lints
+
+* Move [`non_send_fields_in_send_ty`] to `suspicious`
+  [#7874](https://github.com/rust-lang/rust-clippy/pull/7874)
+* Move [`non_ascii_literal`] to `restriction`
+  [#7907](https://github.com/rust-lang/rust-clippy/pull/7907)
+
+### Changes that expand what code existing lints cover
+
+* [`question_mark`] now covers `Result`
+  [#7840](https://github.com/rust-lang/rust-clippy/pull/7840)
+* Make [`useless_format`] recognize bare `format!("")`
+  [#7801](https://github.com/rust-lang/rust-clippy/pull/7801)
+* Lint on underscored variables with no side effects in [`no_effect`]
+  [#7775](https://github.com/rust-lang/rust-clippy/pull/7775)
+* Expand [`match_ref_pats`] to check for multiple reference patterns
+  [#7800](https://github.com/rust-lang/rust-clippy/pull/7800)
+
+### False positive fixes
+
+* Fix false positive of [`implicit_saturating_sub`] with `else` clause
+  [#7832](https://github.com/rust-lang/rust-clippy/pull/7832)
+* Fix [`question_mark`] when there is call in conditional predicate
+  [#7860](https://github.com/rust-lang/rust-clippy/pull/7860)
+* [`mut_mut`] no longer lints when type is defined in external macros
+  [#7795](https://github.com/rust-lang/rust-clippy/pull/7795)
+* Avoid [`eq_op`] in test functions
+  [#7811](https://github.com/rust-lang/rust-clippy/pull/7811)
+* [`cast_possible_truncation`] no longer lints when cast is coming from `signum`
+  method call [#7850](https://github.com/rust-lang/rust-clippy/pull/7850)
+* [`match_str_case_mismatch`] no longer lints on uncased characters
+  [#7865](https://github.com/rust-lang/rust-clippy/pull/7865)
+* [`ptr_arg`] no longer lints references to type aliases
+  [#7890](https://github.com/rust-lang/rust-clippy/pull/7890)
+* [`missing_safety_doc`] now also accepts "implementation safety" headers
+  [#7856](https://github.com/rust-lang/rust-clippy/pull/7856)
+* [`missing_safety_doc`] no longer lints if any parent has `#[doc(hidden)]`
+  attribute [#7849](https://github.com/rust-lang/rust-clippy/pull/7849)
+* [`if_not_else`] now ignores else-if statements
+  [#7895](https://github.com/rust-lang/rust-clippy/pull/7895)
+* Avoid linting [`cast_possible_truncation`] on bit-reducing operations
+  [#7819](https://github.com/rust-lang/rust-clippy/pull/7819)
+* Avoid linting [`field_reassign_with_default`] when `Drop` and `Copy` are
+  involved [#7794](https://github.com/rust-lang/rust-clippy/pull/7794)
+* [`unnecessary_sort_by`] now checks if argument implements `Ord` trait
+  [#7824](https://github.com/rust-lang/rust-clippy/pull/7824)
+* Fix false positive in [`match_overlapping_arm`]
+  [#7847](https://github.com/rust-lang/rust-clippy/pull/7847)
+* Prevent [`needless_lifetimes`] false positive in `async` function definition
+  [#7901](https://github.com/rust-lang/rust-clippy/pull/7901)
+
+### Suggestion fixes/improvements
+
+* Keep an initial `::` when [`doc_markdown`] suggests to use ticks
+  [#7916](https://github.com/rust-lang/rust-clippy/pull/7916)
+* Add a machine applicable suggestion for the [`doc_markdown`] missing backticks
+  lint [#7904](https://github.com/rust-lang/rust-clippy/pull/7904)
+* [`equatable_if_let`] no longer expands macros in the suggestion
+  [#7788](https://github.com/rust-lang/rust-clippy/pull/7788)
+* Make [`shadow_reuse`] suggestion less verbose
+  [#7782](https://github.com/rust-lang/rust-clippy/pull/7782)
+
+### ICE fixes
+
+* Fix ICE in [`enum_variant_names`]
+  [#7873](https://github.com/rust-lang/rust-clippy/pull/7873)
+* Fix ICE in [`undocumented_unsafe_blocks`]
+  [#7891](https://github.com/rust-lang/rust-clippy/pull/7891)
+
+### Documentation improvements
+
+* Fixed naive doc formatting for `#[must_use]` lints ([`must_use_unit`],
+  [`double_must_use`], [`must_use_candidate`], [`let_underscore_must_use`])
+  [#7827](https://github.com/rust-lang/rust-clippy/pull/7827)
+* Fix typo in example for [`match_result_ok`]
+  [#7815](https://github.com/rust-lang/rust-clippy/pull/7815)
+
+### Others
+
+* Allow giving reasons for [`disallowed_types`]
+  [#7791](https://github.com/rust-lang/rust-clippy/pull/7791)
+* Fix [`manual_assert`] and [`match_wild_err_arm`] for `#![no_std]` and Rust
+  2021. [#7851](https://github.com/rust-lang/rust-clippy/pull/7851)
+* Fix regression in [`semicolon_if_nothing_returned`] on macros containing while
+  loops [#7789](https://github.com/rust-lang/rust-clippy/pull/7789)
+* Added a new configuration `literal-suffix-style` to enforce a certain style
+  writing [`unseparated_literal_suffix`]
+  [#7726](https://github.com/rust-lang/rust-clippy/pull/7726)
 
 ## Rust 1.57
 
-Current beta, release 2021-12-02
+Current stable, released 2021-12-02
 
-[7bfc26e...b7f3f7f](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...b7f3f7f)
+[7bfc26e...00e31fa](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...00e31fa)
 
 ### New Lints
 
@@ -161,7 +275,7 @@ Current beta, release 2021-12-02
 
 ## Rust 1.56
 
-Current stable, released 2021-10-21
+Released 2021-10-21
 
 [74d1561...7bfc26e](https://github.com/rust-lang/rust-clippy/compare/74d1561...7bfc26e)
 
@@ -2912,6 +3026,7 @@ Released 2018-09-13
 [`infinite_iter`]: https://rust-lang.github.io/rust-clippy/master/index.html#infinite_iter
 [`inherent_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#inherent_to_string
 [`inherent_to_string_shadow_display`]: https://rust-lang.github.io/rust-clippy/master/index.html#inherent_to_string_shadow_display
+[`init_numbered_fields`]: https://rust-lang.github.io/rust-clippy/master/index.html#init_numbered_fields
 [`inline_always`]: https://rust-lang.github.io/rust-clippy/master/index.html#inline_always
 [`inline_asm_x86_att_syntax`]: https://rust-lang.github.io/rust-clippy/master/index.html#inline_asm_x86_att_syntax
 [`inline_asm_x86_intel_syntax`]: https://rust-lang.github.io/rust-clippy/master/index.html#inline_asm_x86_intel_syntax

src/tools/clippy/CONTRIBUTING.md

@@ -118,16 +118,16 @@ which `IntelliJ Rust` will be able to understand.
 Run `cargo dev setup intellij --repo-path <repo-path>` where `<repo-path>` is a path to the rustc repo
 you just cloned.
 The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to
-Clippys `Cargo.toml`s and should allow `IntelliJ Rust` to understand most of the types that Clippy uses.
+Clippy's `Cargo.toml`s and should allow `IntelliJ Rust` to understand most of the types that Clippy uses.
 Just make sure to remove the dependencies again before finally making a pull request!
 
 [rustc_repo]: https://github.com/rust-lang/rust/
 [IntelliJ_rust_homepage]: https://intellij-rust.github.io/
 
 ### Rust Analyzer
 As of [#6869][6869], [`rust-analyzer`][ra_homepage] can understand that Clippy uses compiler-internals
-using `extern crate` when `package.metadata.rust-analyzer.rustc_private` is set to `true` in Clippys `Cargo.toml.`
-You will required a `nightly` toolchain with the `rustc-dev` component installed.
+using `extern crate` when `package.metadata.rust-analyzer.rustc_private` is set to `true` in Clippy's `Cargo.toml.`
+You will require a `nightly` toolchain with the `rustc-dev` component installed.
 Make sure that in the `rust-analyzer` configuration, you set
 ```
 { "rust-analyzer.rustcSource": "discover" }
@@ -228,7 +228,7 @@ about `subtree`s in the Rust repository see [Rust's `CONTRIBUTING.md`][subtree].
 
 ### Patching git-subtree to work with big repos
 
-Currently there's a bug in `git-subtree` that prevents it from working properly
+Currently, there's a bug in `git-subtree` that prevents it from working properly
 with the [`rust-lang/rust`] repo. There's an open PR to fix that, but it's stale.
 Before continuing with the following steps, we need to manually apply that fix to
 our local copy of `git-subtree`.

src/tools/clippy/README.md

@@ -144,7 +144,7 @@ line. (You can swap `clippy::all` with the specific lint category you are target
 ## Configuration
 
 Some lints can be configured in a TOML file named `clippy.toml` or `.clippy.toml`. It contains a basic `variable =
-value` mapping eg.
+value` mapping e.g.
 
 ```toml
 avoid-breaking-exported-api = false
@@ -155,6 +155,10 @@ cognitive-complexity-threshold = 30
 See the [list of lints](https://rust-lang.github.io/rust-clippy/master/index.html) for more information about which
 lints can be configured and the meaning of the variables.
 
+Note that configuration changes will not apply for code that has already been compiled and cached under `./target/`;
+for example, adding a new string to `doc-valid-idents` may still result in Clippy flagging that string. To be sure that
+any configuration changes are applied, you may want to run `cargo clean` and re-compile your crate from scratch.
+
 To deactivate the “for further information visit *lint-link*” message you can
 define the `CLIPPY_DISABLE_DOCS_LINKS` environment variable.
 
@@ -193,7 +197,7 @@ And to warn on `lint_name`, run
 cargo clippy -- -W clippy::lint_name
 ```
 
-This also works with lint groups. For example you
+This also works with lint groups. For example, you
 can run Clippy with warnings for all lints enabled:
 ```terminal
 cargo clippy -- -W clippy::pedantic
@@ -228,7 +232,7 @@ fn main() {
 You can also omit the patch version when specifying the MSRV, so `msrv = 1.30`
 is equivalent to `msrv = 1.30.0`.
 
-Note: `custom_inner_attributes` is an unstable feature so it has to be enabled explicitly.
+Note: `custom_inner_attributes` is an unstable feature, so it has to be enabled explicitly.
 
 Lints that recognize this configuration option can be found [here](https://rust-lang.github.io/rust-clippy/master/index.html#msrv)
 

src/tools/clippy/clippy_lints/src/approx_const.rs

@@ -87,7 +87,7 @@ impl ApproxConstant {
         let s = s.as_str();
         if s.parse::<f64>().is_ok() {
             for &(constant, name, min_digits, msrv) in &KNOWN_CONSTS {
-                if is_approx_const(constant, &s, min_digits)
+                if is_approx_const(constant, s, min_digits)
                     && msrv.as_ref().map_or(true, |msrv| meets_msrv(self.msrv.as_ref(), msrv))
                 {
                     span_lint_and_help(

src/tools/clippy/clippy_lints/src/attrs.rs

@@ -310,8 +310,10 @@ impl<'tcx> LateLintPass<'tcx> for Attributes {
                                             || is_word(lint, sym::deprecated)
                                             || is_word(lint, sym!(unreachable_pub))
                                             || is_word(lint, sym!(unused))
-                                            || extract_clippy_lint(lint).map_or(false, |s| s.as_str() == "wildcard_imports")
-                                            || extract_clippy_lint(lint).map_or(false, |s| s.as_str() == "enum_glob_use")
+                                            || extract_clippy_lint(lint)
+                                                .map_or(false, |s| s.as_str() == "wildcard_imports")
+                                            || extract_clippy_lint(lint)
+                                                .map_or(false, |s| s.as_str() == "enum_glob_use")
                                         {
                                             return;
                                         }

src/tools/clippy/clippy_lints/src/casts/unnecessary_cast.rs

@@ -49,8 +49,9 @@ pub(super) fn check(
                 if cast_from.kind() == cast_to.kind() =>
             {
                 if let Some(src) = snippet_opt(cx, lit.span) {
-                    let num_lit = NumericLiteral::from_lit_kind(&src, &lit.node).unwrap();
-                    lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+                    if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit.node) {
+                        lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+                    }
                 }
             },
             _ => {