Merge commit '2b030eb03d' into clippyup

CHANGELOG.md

@@ -5463,6 +5463,7 @@ Released 2018-09-13
 [`string_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_to_string
 [`strlen_on_c_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#strlen_on_c_strings
 [`struct_excessive_bools`]: https://rust-lang.github.io/rust-clippy/master/index.html#struct_excessive_bools
+[`struct_field_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#struct_field_names
 [`stutter`]: https://rust-lang.github.io/rust-clippy/master/index.html#stutter
 [`suboptimal_flops`]: https://rust-lang.github.io/rust-clippy/master/index.html#suboptimal_flops
 [`suspicious_arithmetic_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_arithmetic_impl
@@ -5625,6 +5626,7 @@ Released 2018-09-13
 [`single-char-binding-names-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#single-char-binding-names-threshold
 [`too-large-for-stack`]: https://doc.rust-lang.org/clippy/lint_configuration.html#too-large-for-stack
 [`enum-variant-name-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#enum-variant-name-threshold
+[`struct-field-name-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#struct-field-name-threshold
 [`enum-variant-size-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#enum-variant-size-threshold
 [`verbose-bit-mask-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#verbose-bit-mask-threshold
 [`literal-representation-threshold`]: https://doc.rust-lang.org/clippy/lint_configuration.html#literal-representation-threshold

Cargo.toml

@@ -29,7 +29,7 @@ color-print = "0.3.4" # Sync version with Cargo
 anstream = "0.5.0"
 
 [dev-dependencies]
-ui_test = "0.20"
+ui_test = "0.21.2"
 tester = "0.9"
 regex = "1.5"
 toml = "0.7.3"

book/src/development/adding_lints.md

@@ -30,6 +30,7 @@ because that's clearly a non-descriptive name.
   - [Documentation](#documentation)
   - [Running rustfmt](#running-rustfmt)
   - [Debugging](#debugging)
+  - [Conflicting lints](#conflicting-lints)
   - [PR Checklist](#pr-checklist)
   - [Adding configuration to a lint](#adding-configuration-to-a-lint)
   - [Cheat Sheet](#cheat-sheet)
@@ -612,6 +613,24 @@ output in the `stdout` part.
 
 [`dbg!`]: https://doc.rust-lang.org/std/macro.dbg.html
 
+## Conflicting lints
+
+There are several lints that deal with the same pattern but suggest different approaches. In other words, some lints
+may suggest modifications that go in the opposite direction to what some other lints already propose for the same
+code, creating conflicting diagnostics.
+
+When you are creating a lint that ends up in this scenario, the following tips should be encouraged to guide
+classification:
+
+* The only case where they should be in the same category is if that category is `restriction`. For example,
+`semicolon_inside_block` and `semicolon_outside_block`.
+* For all the other cases, they should be in different categories with different levels of allowance. For example,
+`implicit_return` (restriction, allow) and `needless_return` (style, warn).
+
+For lints that are in different categories, it is also recommended that at least one of them should be in the
+`restriction` category. The reason for this is that the `restriction` group is the only group where we don't
+recommend to enable the entire set, but cherry pick lints out of.
+
 ## PR Checklist
 
 Before submitting your PR make sure you followed all the basic requirements:

book/src/lint_configuration.md

@@ -100,7 +100,7 @@ Suppress lints whenever the suggested change would cause breakage for other crat
 ## `msrv`
 The minimum rust version that the project supports
 
-**Default Value:** `None` (`Option<String>`)
+**Default Value:** `Msrv { stack: [] }` (`crate::Msrv`)
 
 ---
 **Affected lints:**
@@ -273,6 +273,16 @@ The minimum number of enum variants for the lints about variant names to trigger
 * [`enum_variant_names`](https://rust-lang.github.io/rust-clippy/master/index.html#enum_variant_names)
 
 
+## `struct-field-name-threshold`
+The minimum number of struct fields for the lints about field names to trigger
+
+**Default Value:** `3` (`u64`)
+
+---
+**Affected lints:**
+* [`struct_variant_names`](https://rust-lang.github.io/rust-clippy/master/index.html#struct_variant_names)
+
+
 ## `enum-variant-size-threshold`
 The maximum size of an enum's variant to avoid box suggestion
 

clippy_lints/src/async_yields_async.rs

@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_hir_and_then;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::implements_trait;
 use rustc_errors::Applicability;
-use rustc_hir::{AsyncCoroutineKind, Body, BodyId, ExprKind, CoroutineKind, QPath};
+use rustc_hir::{AsyncCoroutineKind, Body, BodyId, CoroutineKind, ExprKind, QPath};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 

clippy_lints/src/await_holding_invalid.rs

@@ -287,5 +287,8 @@ fn is_mutex_guard(cx: &LateContext<'_>, def_id: DefId) -> bool {
 }
 
 fn is_refcell_ref(cx: &LateContext<'_>, def_id: DefId) -> bool {
-    matches!(cx.tcx.get_diagnostic_name(def_id), Some(sym::RefCellRef | sym::RefCellRefMut))
+    matches!(
+        cx.tcx.get_diagnostic_name(def_id),
+        Some(sym::RefCellRef | sym::RefCellRefMut)
+    )
 }

clippy_lints/src/box_default.rs

@@ -3,8 +3,9 @@ use clippy_utils::macros::macro_backtrace;
 use clippy_utils::ty::expr_sig;
 use clippy_utils::{get_parent_node, is_default_equivalent, path_def_id};
 use rustc_errors::Applicability;
+use rustc_hir::def::Res;
 use rustc_hir::intravisit::{walk_ty, Visitor};
-use rustc_hir::{def::Res, Block, Expr, ExprKind, Local, Node, QPath, TyKind};
+use rustc_hir::{Block, Expr, ExprKind, Local, Node, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::print::with_forced_trimmed_paths;

clippy_lints/src/declared_lints.rs

@@ -154,9 +154,6 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::endian_bytes::LITTLE_ENDIAN_BYTES_INFO,
     crate::entry::MAP_ENTRY_INFO,
     crate::enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT_INFO,
-    crate::enum_variants::ENUM_VARIANT_NAMES_INFO,
-    crate::enum_variants::MODULE_INCEPTION_INFO,
-    crate::enum_variants::MODULE_NAME_REPETITIONS_INFO,
     crate::equatable_if_let::EQUATABLE_IF_LET_INFO,
     crate::error_impl_error::ERROR_IMPL_ERROR_INFO,
     crate::escape::BOXED_LOCAL_INFO,
@@ -226,6 +223,10 @@ pub(crate) static LINTS: &[&crate::LintInfo] = &[
     crate::instant_subtraction::UNCHECKED_DURATION_SUBTRACTION_INFO,
     crate::int_plus_one::INT_PLUS_ONE_INFO,
     crate::invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS_INFO,
+    crate::item_name_repetitions::ENUM_VARIANT_NAMES_INFO,
+    crate::item_name_repetitions::MODULE_INCEPTION_INFO,
+    crate::item_name_repetitions::MODULE_NAME_REPETITIONS_INFO,
+    crate::item_name_repetitions::STRUCT_FIELD_NAMES_INFO,
     crate::items_after_statements::ITEMS_AFTER_STATEMENTS_INFO,
     crate::items_after_test_module::ITEMS_AFTER_TEST_MODULE_INFO,
     crate::iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR_INFO,

clippy_lints/src/default_instead_of_iter_empty.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::source::snippet_with_context;
 use clippy_utils::last_path_segment;
+use clippy_utils::source::snippet_with_context;
 use rustc_errors::Applicability;
 use rustc_hir::{def, Expr, ExprKind, GenericArg, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/exit.rs

@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::{is_entrypoint_fn};
+use clippy_utils::is_entrypoint_fn;
 use if_chain::if_chain;
 use rustc_hir::{Expr, ExprKind, Item, ItemKind, Node};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/from_raw_with_void_ptr.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::ty::is_c_void;
 use clippy_utils::path_def_id;
+use clippy_utils::ty::is_c_void;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{Expr, ExprKind, QPath};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/functions/impl_trait_in_params.rs

@@ -1,50 +1,104 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::is_in_test_function;
 
+use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
-use rustc_hir::{Body, HirId};
+use rustc_hir::{Body, GenericParam, Generics, HirId, ImplItem, ImplItemKind, TraitItem, TraitItemKind};
 use rustc_lint::LateContext;
-use rustc_span::Span;
+use rustc_span::symbol::Ident;
+use rustc_span::{BytePos, Span};
 
 use super::IMPL_TRAIT_IN_PARAMS;
 
+fn report(
+    cx: &LateContext<'_>,
+    param: &GenericParam<'_>,
+    ident: &Ident,
+    generics: &Generics<'_>,
+    first_param_span: Span,
+) {
+    // No generics with nested generics, and no generics like FnMut(x)
+    span_lint_and_then(
+        cx,
+        IMPL_TRAIT_IN_PARAMS,
+        param.span,
+        "`impl Trait` used as a function parameter",
+        |diag| {
+            if let Some(gen_span) = generics.span_for_param_suggestion() {
+                // If there's already a generic param with the same bound, do not lint **this** suggestion.
+                diag.span_suggestion_with_style(
+                    gen_span,
+                    "add a type parameter",
+                    format!(", {{ /* Generic name */ }}: {}", &param.name.ident().as_str()[5..]),
+                    rustc_errors::Applicability::HasPlaceholders,
+                    rustc_errors::SuggestionStyle::ShowAlways,
+                );
+            } else {
+                diag.span_suggestion_with_style(
+                    Span::new(
+                        first_param_span.lo() - rustc_span::BytePos(1),
+                        ident.span.hi(),
+                        ident.span.ctxt(),
+                        ident.span.parent(),
+                    ),
+                    "add a type parameter",
+                    format!("<{{ /* Generic name */ }}: {}>", &param.name.ident().as_str()[5..]),
+                    rustc_errors::Applicability::HasPlaceholders,
+                    rustc_errors::SuggestionStyle::ShowAlways,
+                );
+            }
+        },
+    );
+}
+
 pub(super) fn check_fn<'tcx>(cx: &LateContext<'_>, kind: &'tcx FnKind<'_>, body: &'tcx Body<'_>, hir_id: HirId) {
-    if cx.tcx.visibility(cx.tcx.hir().body_owner_def_id(body.id())).is_public() && !is_in_test_function(cx.tcx, hir_id)
+    if_chain! {
-    {
+        if let FnKind::ItemFn(ident, generics, _) = kind;
-        if let FnKind::ItemFn(ident, generics, _) = kind {
+        if cx.tcx.visibility(cx.tcx.hir().body_owner_def_id(body.id())).is_public();
+        if !is_in_test_function(cx.tcx, hir_id);
+        then {
             for param in generics.params {
                 if param.is_impl_trait() {
-                    // No generics with nested generics, and no generics like FnMut(x)
+                    report(cx, param, ident, generics, body.params[0].span);
-                    span_lint_and_then(
+                };
-                        cx,
+            }
-                        IMPL_TRAIT_IN_PARAMS,
+        }
-                        param.span,
+    }
-                        "'`impl Trait` used as a function parameter'",
+}
-                        |diag| {
+
-                            if let Some(gen_span) = generics.span_for_param_suggestion() {
+pub(super) fn check_impl_item(cx: &LateContext<'_>, impl_item: &ImplItem<'_>) {
-                                diag.span_suggestion_with_style(
+    if_chain! {
-                                    gen_span,
+        if let ImplItemKind::Fn(_, body_id) = impl_item.kind;
-                                    "add a type parameter",
+        if let hir::Node::Item(item) = cx.tcx.hir().get_parent(impl_item.hir_id());
-                                    format!(", {{ /* Generic name */ }}: {}", &param.name.ident().as_str()[5..]),
+        if let hir::ItemKind::Impl(impl_) = item.kind;
-                                    rustc_errors::Applicability::HasPlaceholders,
+        if let hir::Impl { of_trait, .. } = *impl_;
-                                    rustc_errors::SuggestionStyle::ShowAlways,
+        if of_trait.is_none();
-                                );
+        let body = cx.tcx.hir().body(body_id);
-                            } else {
+        if cx.tcx.visibility(cx.tcx.hir().body_owner_def_id(body.id())).is_public();
-                                diag.span_suggestion_with_style(
+        if !is_in_test_function(cx.tcx, impl_item.hir_id());
-                                    Span::new(
+        then {
-                                        body.params[0].span.lo() - rustc_span::BytePos(1),
+            for param in impl_item.generics.params {
-                                        ident.span.hi(),
+                if param.is_impl_trait() {
-                                        ident.span.ctxt(),
+                    report(cx, param, &impl_item.ident, impl_item.generics, body.params[0].span);
-                                        ident.span.parent(),
+                }
-                                    ),
+            }
-                                    "add a type parameter",
+        }
-                                    format!("<{{ /* Generic name */ }}: {}>", &param.name.ident().as_str()[5..]),
+    }
-                                    rustc_errors::Applicability::HasPlaceholders,
+}
-                                    rustc_errors::SuggestionStyle::ShowAlways,
+
-                                );
+pub(super) fn check_trait_item(cx: &LateContext<'_>, trait_item: &TraitItem<'_>, avoid_breaking_exported_api: bool) {
-                            }
+    if_chain! {
-                        },
+        if !avoid_breaking_exported_api;
-                    );
+        if let TraitItemKind::Fn(_, _) = trait_item.kind;
+        if let hir::Node::Item(item) = cx.tcx.hir().get_parent(trait_item.hir_id());
+        // ^^ (Will always be a trait)
+        if !item.vis_span.is_empty(); // Is public
+        if !is_in_test_function(cx.tcx, trait_item.hir_id());
+        then {
+            for param in trait_item.generics.params {
+                if param.is_impl_trait() {
+                    let sp = trait_item.ident.span.with_hi(trait_item.ident.span.hi() + BytePos(1));
+                    report(cx, param, &trait_item.ident, trait_item.generics, sp.shrink_to_hi());
                 }
             }
         }

clippy_lints/src/functions/mod.rs

@@ -360,18 +360,26 @@ declare_clippy_lint! {
 }
 
 #[derive(Copy, Clone)]
+#[allow(clippy::struct_field_names)]
 pub struct Functions {
     too_many_arguments_threshold: u64,
     too_many_lines_threshold: u64,
     large_error_threshold: u64,
+    avoid_breaking_exported_api: bool,
 }
 
 impl Functions {
-    pub fn new(too_many_arguments_threshold: u64, too_many_lines_threshold: u64, large_error_threshold: u64) -> Self {
+    pub fn new(
+        too_many_arguments_threshold: u64,
+        too_many_lines_threshold: u64,
+        large_error_threshold: u64,
+        avoid_breaking_exported_api: bool,
+    ) -> Self {
         Self {
             too_many_arguments_threshold,
             too_many_lines_threshold,
             large_error_threshold,
+            avoid_breaking_exported_api,
         }
     }
 }
@@ -415,6 +423,7 @@ impl<'tcx> LateLintPass<'tcx> for Functions {
     fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
         must_use::check_impl_item(cx, item);
         result::check_impl_item(cx, item, self.large_error_threshold);
+        impl_trait_in_params::check_impl_item(cx, item);
     }
 
     fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
@@ -422,5 +431,6 @@ impl<'tcx> LateLintPass<'tcx> for Functions {
         not_unsafe_ptr_arg_deref::check_trait_item(cx, item);
         must_use::check_trait_item(cx, item);
         result::check_trait_item(cx, item, self.large_error_threshold);
+        impl_trait_in_params::check_trait_item(cx, item, self.avoid_breaking_exported_api);
     }
 }

clippy_lints/src/item_name_repetitions.rs

@@ -1,9 +1,10 @@
 //! lint on enum variants that are prefixed or suffixed by the same characters
 
 use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_hir};
+use clippy_utils::macros::span_is_local;
 use clippy_utils::source::is_present_in_source;
-use clippy_utils::str_utils::{camel_case_split, count_match_end, count_match_start};
+use clippy_utils::str_utils::{camel_case_split, count_match_end, count_match_start, to_camel_case, to_snake_case};
-use rustc_hir::{EnumDef, Item, ItemKind, OwnerId, Variant};
+use rustc_hir::{EnumDef, FieldDef, Item, ItemKind, OwnerId, Variant, VariantData};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::source_map::Span;
@@ -103,32 +104,184 @@ declare_clippy_lint! {
     style,
     "modules that have the same name as their parent module"
 }
+declare_clippy_lint! {
+    /// ### What it does
+    /// Detects struct fields that are prefixed or suffixed
+    /// by the same characters or the name of the struct itself.
+    ///
+    /// ### Why is this bad?
+    /// Information common to all struct fields is better represented in the struct name.
+    ///
+    /// ### Limitations
+    /// Characters with no casing will be considered when comparing prefixes/suffixes
+    /// This applies to numbers and non-ascii characters without casing
+    /// e.g. `foo1` and `foo2` is considered to have different prefixes
+    /// (the prefixes are `foo1` and `foo2` respectively), as also `bar螃`, `bar蟹`
+    ///
+    /// ### Example
+    /// ```rust
+    /// struct Cake {
+    ///     cake_sugar: u8,
+    ///     cake_flour: u8,
+    ///     cake_eggs: u8
+    /// }
+    /// ```
+    /// Use instead:
+    /// ```rust
+    /// struct Cake {
+    ///     sugar: u8,
+    ///     flour: u8,
+    ///     eggs: u8
+    /// }
+    /// ```
+    #[clippy::version = "1.75.0"]
+    pub STRUCT_FIELD_NAMES,
+    pedantic,
+    "structs where all fields share a prefix/postfix or contain the name of the struct"
+}
 
-pub struct EnumVariantNames {
+pub struct ItemNameRepetitions {
     modules: Vec<(Symbol, String, OwnerId)>,
-    threshold: u64,
+    enum_threshold: u64,
+    struct_threshold: u64,
     avoid_breaking_exported_api: bool,
     allow_private_module_inception: bool,
 }
 
-impl EnumVariantNames {
+impl ItemNameRepetitions {
     #[must_use]
-    pub fn new(threshold: u64, avoid_breaking_exported_api: bool, allow_private_module_inception: bool) -> Self {
+    pub fn new(
+        enum_threshold: u64,
+        struct_threshold: u64,
+        avoid_breaking_exported_api: bool,
+        allow_private_module_inception: bool,
+    ) -> Self {
         Self {
             modules: Vec::new(),
-            threshold,
+            enum_threshold,
+            struct_threshold,
             avoid_breaking_exported_api,
             allow_private_module_inception,
         }
     }
 }
 
-impl_lint_pass!(EnumVariantNames => [
+impl_lint_pass!(ItemNameRepetitions => [
     ENUM_VARIANT_NAMES,
+    STRUCT_FIELD_NAMES,
     MODULE_NAME_REPETITIONS,
     MODULE_INCEPTION
 ]);
 
+#[must_use]
+fn have_no_extra_prefix(prefixes: &[&str]) -> bool {
+    prefixes.iter().all(|p| p == &"" || p == &"_")
+}
+
+fn check_fields(cx: &LateContext<'_>, threshold: u64, item: &Item<'_>, fields: &[FieldDef<'_>]) {
+    if (fields.len() as u64) < threshold {
+        return;
+    }
+
+    check_struct_name_repetition(cx, item, fields);
+
+    // if the SyntaxContext of the identifiers of the fields and struct differ dont lint them.
+    // this prevents linting in macros in which the location of the field identifier names differ
+    if !fields.iter().all(|field| item.ident.span.eq_ctxt(field.ident.span)) {
+        return;
+    }
+
+    let mut pre: Vec<&str> = match fields.first() {
+        Some(first_field) => first_field.ident.name.as_str().split('_').collect(),
+        None => return,
+    };
+    let mut post = pre.clone();
+    post.reverse();
+    for field in fields {
+        let field_split: Vec<&str> = field.ident.name.as_str().split('_').collect();
+        if field_split.len() == 1 {
+            return;
+        }
+
+        pre = pre
+            .into_iter()
+            .zip(field_split.iter())
+            .take_while(|(a, b)| &a == b)
+            .map(|e| e.0)
+            .collect();
+        post = post
+            .into_iter()
+            .zip(field_split.iter().rev())
+            .take_while(|(a, b)| &a == b)
+            .map(|e| e.0)
+            .collect();
+    }
+    let prefix = pre.join("_");
+    post.reverse();
+    let postfix = match post.last() {
+        Some(&"") => post.join("_") + "_",
+        Some(_) | None => post.join("_"),
+    };
+    if fields.len() > 1 {
+        let (what, value) = match (
+            prefix.is_empty() || prefix.chars().all(|c| c == '_'),
+            postfix.is_empty(),
+        ) {
+            (true, true) => return,
+            (false, _) => ("pre", prefix),
+            (true, false) => ("post", postfix),
+        };
+        span_lint_and_help(
+            cx,
+            STRUCT_FIELD_NAMES,
+            item.span,
+            &format!("all fields have the same {what}fix: `{value}`"),
+            None,
+            &format!("remove the {what}fixes"),
+        );
+    }
+}
+
+fn check_struct_name_repetition(cx: &LateContext<'_>, item: &Item<'_>, fields: &[FieldDef<'_>]) {
+    let snake_name = to_snake_case(item.ident.name.as_str());
+    let item_name_words: Vec<&str> = snake_name.split('_').collect();
+    for field in fields {
+        if field.ident.span.eq_ctxt(item.ident.span) {
+            //consider linting only if the field identifier has the same SyntaxContext as the item(struct)
+            let field_words: Vec<&str> = field.ident.name.as_str().split('_').collect();
+            if field_words.len() >= item_name_words.len() {
+                // if the field name is shorter than the struct name it cannot contain it
+                if field_words.iter().zip(item_name_words.iter()).all(|(a, b)| a == b) {
+                    span_lint_hir(
+                        cx,
+                        STRUCT_FIELD_NAMES,
+                        field.hir_id,
+                        field.span,
+                        "field name starts with the struct's name",
+                    );
+                }
+                if field_words.len() > item_name_words.len() {
+                    // lint only if the end is not covered by the start
+                    if field_words
+                        .iter()
+                        .rev()
+                        .zip(item_name_words.iter().rev())
+                        .all(|(a, b)| a == b)
+                    {
+                        span_lint_hir(
+                            cx,
+                            STRUCT_FIELD_NAMES,
+                            field.hir_id,
+                            field.span,
+                            "field name ends with the struct's name",
+                        );
+                    }
+                }
+            }
+        }
+    }
+}
+
 fn check_enum_start(cx: &LateContext<'_>, item_name: &str, variant: &Variant<'_>) {
     let name = variant.ident.name.as_str();
     let item_name_chars = item_name.chars().count();
@@ -218,35 +371,7 @@ fn check_variant(cx: &LateContext<'_>, threshold: u64, def: &EnumDef<'_>, item_n
     );
 }
 
-#[must_use]
+impl LateLintPass<'_> for ItemNameRepetitions {
-fn have_no_extra_prefix(prefixes: &[&str]) -> bool {
-    prefixes.iter().all(|p| p == &"" || p == &"_")
-}
-
-#[must_use]
-fn to_camel_case(item_name: &str) -> String {
-    let mut s = String::new();
-    let mut up = true;
-    for c in item_name.chars() {
-        if c.is_uppercase() {
-            // we only turn snake case text into CamelCase
-            return item_name.to_string();
-        }
-        if c == '_' {
-            up = true;
-            continue;
-        }
-        if up {
-            up = false;
-            s.extend(c.to_uppercase());
-        } else {
-            s.push(c);
-        }
-    }
-    s
-}
-
-impl LateLintPass<'_> for EnumVariantNames {
     fn check_item_post(&mut self, _cx: &LateContext<'_>, _item: &Item<'_>) {
         let last = self.modules.pop();
         assert!(last.is_some());
@@ -303,9 +428,15 @@ impl LateLintPass<'_> for EnumVariantNames {
                 }
             }
         }
-        if let ItemKind::Enum(ref def, _) = item.kind {
+        if !(self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(item.owner_id.def_id))
-            if !(self.avoid_breaking_exported_api && cx.effective_visibilities.is_exported(item.owner_id.def_id)) {
+            && span_is_local(item.span)
-                check_variant(cx, self.threshold, def, item_name, item.span);
+        {
+            match item.kind {
+                ItemKind::Enum(def, _) => check_variant(cx, self.enum_threshold, &def, item_name, item.span),
+                ItemKind::Struct(VariantData::Struct(fields, _), _) => {
+                    check_fields(cx, self.struct_threshold, item, fields);
+                },
+                _ => (),
             }
         }
         self.modules.push((item.ident.name, item_camel, item.owner_id));

clippy_lints/src/iter_without_into_iter.rs

@@ -9,6 +9,7 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{self, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::{sym, Symbol};
+use std::iter;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -52,12 +53,13 @@ declare_clippy_lint! {
 declare_clippy_lint! {
     /// ### What it does
     /// This is the opposite of the `iter_without_into_iter` lint.
-    /// It looks for `IntoIterator for (&|&mut) Type` implementations without an inherent `iter` or `iter_mut` method.
+    /// It looks for `IntoIterator for (&|&mut) Type` implementations without an inherent `iter` or `iter_mut` method
+    /// on the type or on any of the types in its `Deref` chain.
     ///
     /// ### Why is this bad?
     /// It's not bad, but having them is idiomatic and allows the type to be used in iterator chains
-    /// by just calling `.iter()`, instead of the more awkward `<&Type>::into_iter` or `(&val).iter()` syntax
+    /// by just calling `.iter()`, instead of the more awkward `<&Type>::into_iter` or `(&val).into_iter()` syntax
-    /// in case of ambiguity with another `Intoiterator` impl.
+    /// in case of ambiguity with another `IntoIterator` impl.
     ///
     /// ### Example
     /// ```rust
@@ -102,7 +104,20 @@ fn is_nameable_in_impl_trait(ty: &rustc_hir::Ty<'_>) -> bool {
     !matches!(ty.kind, TyKind::OpaqueDef(..))
 }
 
-fn type_has_inherent_method(cx: &LateContext<'_>, ty: Ty<'_>, method_name: Symbol) -> bool {
+/// Returns the deref chain of a type, starting with the type itself.
+fn deref_chain<'cx, 'tcx>(cx: &'cx LateContext<'tcx>, ty: Ty<'tcx>) -> impl Iterator<Item = Ty<'tcx>> + 'cx {
+    iter::successors(Some(ty), |&ty| {
+        if let Some(deref_did) = cx.tcx.lang_items().deref_trait()
+            && implements_trait(cx, ty, deref_did, &[])
+        {
+            make_normalized_projection(cx.tcx, cx.param_env, deref_did, sym::Target, [ty])
+        } else {
+            None
+        }
+    })
+}
+
+fn adt_has_inherent_method(cx: &LateContext<'_>, ty: Ty<'_>, method_name: Symbol) -> bool {
     if let Some(ty_did) = ty.ty_adt_def().map(ty::AdtDef::did) {
         cx.tcx.inherent_impls(ty_did).iter().any(|&did| {
             cx.tcx
@@ -127,7 +142,11 @@ impl LateLintPass<'_> for IterWithoutIntoIter {
                 Mutability::Mut => sym::iter_mut,
                 Mutability::Not => sym::iter,
             }
-            && !type_has_inherent_method(cx, ty, expected_method_name)
+            && !deref_chain(cx, ty)
+                .any(|ty| {
+                    // We can't check inherent impls for slices, but we know that they have an `iter(_mut)` method
+                    ty.peel_refs().is_slice() || adt_has_inherent_method(cx, ty, expected_method_name)
+                })
             && let Some(iter_assoc_span) = imp.items.iter().find_map(|item| {
                 if item.ident.name == sym!(IntoIter) {
                     Some(cx.tcx.hir().impl_item(item.id).expect_type().span)

clippy_lints/src/lib.rs

@@ -50,9 +50,6 @@ extern crate clippy_utils;
 #[macro_use]
 extern crate declare_clippy_lint;
 
-use std::io;
-use std::path::PathBuf;
-
 use clippy_utils::msrvs::Msrv;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_lint::{Lint, LintId};
@@ -121,7 +118,6 @@ mod empty_structs_with_brackets;
 mod endian_bytes;
 mod entry;
 mod enum_clike;
-mod enum_variants;
 mod equatable_if_let;
 mod error_impl_error;
 mod escape;
@@ -166,6 +162,7 @@ mod inline_fn_without_body;
 mod instant_subtraction;
 mod int_plus_one;
 mod invalid_upcast_comparisons;
+mod item_name_repetitions;
 mod items_after_statements;
 mod items_after_test_module;
 mod iter_not_returning_iterator;
@@ -362,7 +359,6 @@ mod zero_sized_map_values;
 // end lints modules, do not remove this comment, it’s used in `update_lints`
 
 use crate::utils::conf::metadata::get_configuration_metadata;
-use crate::utils::conf::TryConf;
 pub use crate::utils::conf::{lookup_conf_file, Conf};
 use crate::utils::FindAll;
 
@@ -374,65 +370,13 @@ use crate::utils::FindAll;
 /// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass.
 ///
 /// Used in `./src/driver.rs`.
-pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, conf: &'static Conf) {
     // NOTE: Do not add any more pre-expansion passes. These should be removed eventually.
-    let msrv = Msrv::read(&conf.msrv, sess);
+    let msrv = || conf.msrv.clone();
-    let msrv = move || msrv.clone();
 
     store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv: msrv() }));
 }
 
-#[doc(hidden)]
-pub fn read_conf(sess: &Session, path: &io::Result<(Option<PathBuf>, Vec<String>)>) -> Conf {
-    if let Ok((_, warnings)) = path {
-        for warning in warnings {
-            sess.warn(warning.clone());
-        }
-    }
-    let file_name = match path {
-        Ok((Some(path), _)) => path,
-        Ok((None, _)) => return Conf::default(),
-        Err(error) => {
-            sess.err(format!("error finding Clippy's configuration file: {error}"));
-            return Conf::default();
-        },
-    };
-
-    let TryConf { conf, errors, warnings } = utils::conf::read(sess, file_name);
-    // all conf errors are non-fatal, we just use the default conf in case of error
-    for error in errors {
-        if let Some(span) = error.span {
-            sess.span_err(
-                span,
-                format!("error reading Clippy's configuration file: {}", error.message),
-            );
-        } else {
-            sess.err(format!(
-                "error reading Clippy's configuration file `{}`: {}",
-                file_name.display(),
-                error.message
-            ));
-        }
-    }
-
-    for warning in warnings {
-        if let Some(span) = warning.span {
-            sess.span_warn(
-                span,
-                format!("error reading Clippy's configuration file: {}", warning.message),
-            );
-        } else {
-            sess.warn(format!(
-                "error reading Clippy's configuration file `{}`: {}",
-                file_name.display(),
-                warning.message
-            ));
-        }
-    }
-
-    conf
-}
-
 #[derive(Default)]
 struct RegistrationGroups {
     all: Vec<LintId>,
@@ -558,7 +502,7 @@ fn register_categories(store: &mut rustc_lint::LintStore) {
 ///
 /// Used in `./src/driver.rs`.
 #[expect(clippy::too_many_lines)]
-pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &'static Conf) {
     register_removed_non_tool_lints(store);
     register_categories(store);
 
@@ -660,8 +604,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(|_| Box::new(non_octal_unix_permissions::NonOctalUnixPermissions));
     store.register_early_pass(|| Box::new(unnecessary_self_imports::UnnecessarySelfImports));
 
-    let msrv = Msrv::read(&conf.msrv, sess);
+    let msrv = || conf.msrv.clone();
-    let msrv = move || msrv.clone();
     let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
     let allow_expect_in_tests = conf.allow_expect_in_tests;
     let allow_unwrap_in_tests = conf.allow_unwrap_in_tests;
@@ -762,6 +705,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
             too_many_arguments_threshold,
             too_many_lines_threshold,
             large_error_threshold,
+            avoid_breaking_exported_api,
         ))
     });
     let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>();
@@ -806,7 +750,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
             suppress_restriction_lint_in_const,
         ))
     });
-    store.register_late_pass(|_| Box::new(non_copy_const::NonCopyConst));
+    let ignore_interior_mutability = conf.ignore_interior_mutability.clone();
+    store.register_late_pass(move |_| Box::new(non_copy_const::NonCopyConst::new(ignore_interior_mutability.clone())));
     store.register_late_pass(|_| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
     store.register_late_pass(|_| Box::new(redundant_clone::RedundantClone));
     store.register_late_pass(|_| Box::new(slow_vector_initialization::SlowVectorInit));
@@ -851,10 +796,12 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         ))
     });
     let enum_variant_name_threshold = conf.enum_variant_name_threshold;
+    let struct_field_name_threshold = conf.struct_field_name_threshold;
     let allow_private_module_inception = conf.allow_private_module_inception;
     store.register_late_pass(move |_| {
-        Box::new(enum_variants::EnumVariantNames::new(
+        Box::new(item_name_repetitions::ItemNameRepetitions::new(
             enum_variant_name_threshold,
+            struct_field_name_threshold,
             avoid_breaking_exported_api,
             allow_private_module_inception,
         ))

clippy_lints/src/loops/same_item_push.rs

@@ -185,7 +185,7 @@ fn get_vec_push<'tcx>(
             if let StmtKind::Semi(semi_stmt) = &stmt.kind;
             if let ExprKind::MethodCall(path, self_expr, args, _) = &semi_stmt.kind;
             // Figure out the parameters for the method call
-            if let Some(pushed_item) = args.get(0);
+            if let Some(pushed_item) = args.first();
             // Check that the method being called is push() on a Vec
             if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(self_expr), sym::Vec);
             if path.ident.name.as_str() == "push";

clippy_lints/src/manual_async_fn.rs

@@ -4,7 +4,7 @@ use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
-    AsyncCoroutineKind, Block, Body, Closure, Expr, ExprKind, FnDecl, FnRetTy, CoroutineKind, GenericArg, GenericBound,
+    AsyncCoroutineKind, Block, Body, Closure, CoroutineKind, Expr, ExprKind, FnDecl, FnRetTy, GenericArg, GenericBound,
     ImplItem, Item, ItemKind, LifetimeName, Node, Term, TraitRef, Ty, TyKind, TypeBindingKind,
 };
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/manual_bits.rs

@@ -103,9 +103,9 @@ fn get_size_of_ty<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<
         if let ExprKind::Path(ref count_func_qpath) = count_func.kind;
 
         if let QPath::Resolved(_, count_func_path) = count_func_qpath;
-        if let Some(segment_zero) = count_func_path.segments.get(0);
+        if let Some(segment_zero) = count_func_path.segments.first();
         if let Some(args) = segment_zero.args;
-        if let Some(GenericArg::Type(real_ty)) = args.args.get(0);
+        if let Some(GenericArg::Type(real_ty)) = args.args.first();
 
         if let Some(def_id) = cx.qpath_res(count_func_qpath, count_func.hir_id).opt_def_id();
         if cx.tcx.is_diagnostic_item(sym::mem_size_of, def_id);

clippy_lints/src/manual_is_ascii_check.rs

@@ -15,12 +15,13 @@ use rustc_span::{sym, Span};
 declare_clippy_lint! {
     /// ### What it does
     /// Suggests to use dedicated built-in methods,
-    /// `is_ascii_(lowercase|uppercase|digit)` for checking on corresponding ascii range
+    /// `is_ascii_(lowercase|uppercase|digit|hexdigit)` for checking on corresponding
+    /// ascii range
     ///
     /// ### Why is this bad?
     /// Using the built-in functions is more readable and makes it
     /// clear that it's not a specific subset of characters, but all
-    /// ASCII (lowercase|uppercase|digit) characters.
+    /// ASCII (lowercase|uppercase|digit|hexdigit) characters.
     /// ### Example
     /// ```rust
     /// fn main() {
@@ -28,6 +29,7 @@ declare_clippy_lint! {
     ///     assert!(matches!(b'X', b'A'..=b'Z'));
     ///     assert!(matches!('2', '0'..='9'));
     ///     assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+    ///     assert!(matches!('C', '0'..='9' | 'a'..='f' | 'A'..='F'));
     ///
     ///     ('0'..='9').contains(&'0');
     ///     ('a'..='z').contains(&'a');
@@ -41,6 +43,7 @@ declare_clippy_lint! {
     ///     assert!(b'X'.is_ascii_uppercase());
     ///     assert!('2'.is_ascii_digit());
     ///     assert!('x'.is_ascii_alphabetic());
+    ///     assert!('C'.is_ascii_hexdigit());
     ///
     ///     '0'.is_ascii_digit();
     ///     'a'.is_ascii_lowercase();
@@ -75,6 +78,12 @@ enum CharRange {
     FullChar,
     /// '0..=9'
     Digit,
+    /// 'a..=f'
+    LowerHexLetter,
+    /// 'A..=F'
+    UpperHexLetter,
+    /// '0..=9' | 'a..=f' | 'A..=F'
+    HexDigit,
     Otherwise,
 }
 
@@ -116,7 +125,8 @@ fn check_is_ascii(cx: &LateContext<'_>, span: Span, recv: &Expr<'_>, range: &Cha
         CharRange::LowerChar => Some("is_ascii_lowercase"),
         CharRange::FullChar => Some("is_ascii_alphabetic"),
         CharRange::Digit => Some("is_ascii_digit"),
-        CharRange::Otherwise => None,
+        CharRange::HexDigit => Some("is_ascii_hexdigit"),
+        CharRange::Otherwise | CharRange::LowerHexLetter | CharRange::UpperHexLetter => None,
     } {
         let default_snip = "..";
         let mut app = Applicability::MachineApplicable;
@@ -141,6 +151,12 @@ fn check_pat(pat_kind: &PatKind<'_>) -> CharRange {
 
             if ranges.len() == 2 && ranges.contains(&CharRange::UpperChar) && ranges.contains(&CharRange::LowerChar) {
                 CharRange::FullChar
+            } else if ranges.len() == 3
+                && ranges.contains(&CharRange::Digit)
+                && ranges.contains(&CharRange::LowerHexLetter)
+                && ranges.contains(&CharRange::UpperHexLetter)
+            {
+                CharRange::HexDigit
             } else {
                 CharRange::Otherwise
             }
@@ -156,6 +172,8 @@ fn check_range(start: &Expr<'_>, end: &Expr<'_>) -> CharRange {
         match (&start_lit.node, &end_lit.node) {
             (Char('a'), Char('z')) | (Byte(b'a'), Byte(b'z')) => CharRange::LowerChar,
             (Char('A'), Char('Z')) | (Byte(b'A'), Byte(b'Z')) => CharRange::UpperChar,
+            (Char('a'), Char('f')) | (Byte(b'a'), Byte(b'f')) => CharRange::LowerHexLetter,
+            (Char('A'), Char('F')) | (Byte(b'A'), Byte(b'F')) => CharRange::UpperHexLetter,
             (Char('0'), Char('9')) | (Byte(b'0'), Byte(b'9')) => CharRange::Digit,
             _ => CharRange::Otherwise,
         }

clippy_lints/src/matches/mod.rs

@@ -967,7 +967,6 @@ declare_clippy_lint! {
     "checks for unnecessary guards in match expressions"
 }
 
-#[derive(Default)]
 pub struct Matches {
     msrv: Msrv,
     infallible_destructuring_match_linted: bool,
@@ -978,7 +977,7 @@ impl Matches {
     pub fn new(msrv: Msrv) -> Self {
         Self {
             msrv,
-            ..Matches::default()
+            infallible_destructuring_match_linted: false,
         }
     }
 }

clippy_lints/src/methods/filter_map_identity.rs

@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::{is_expr_identity_function, is_trait_method};
+use clippy_utils::{is_expr_untyped_identity_function, is_trait_method};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -9,7 +9,7 @@ use rustc_span::sym;
 use super::FILTER_MAP_IDENTITY;
 
 pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, filter_map_arg: &hir::Expr<'_>, filter_map_span: Span) {
-    if is_trait_method(cx, expr, sym::Iterator) && is_expr_identity_function(cx, filter_map_arg) {
+    if is_trait_method(cx, expr, sym::Iterator) && is_expr_untyped_identity_function(cx, filter_map_arg) {
         span_lint_and_sugg(
             cx,
             FILTER_MAP_IDENTITY,

clippy_lints/src/methods/flat_map_identity.rs

@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::{is_expr_identity_function, is_trait_method};
+use clippy_utils::{is_expr_untyped_identity_function, is_trait_method};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -15,7 +15,7 @@ pub(super) fn check<'tcx>(
     flat_map_arg: &'tcx hir::Expr<'_>,
     flat_map_span: Span,
 ) {
-    if is_trait_method(cx, expr, sym::Iterator) && is_expr_identity_function(cx, flat_map_arg) {
+    if is_trait_method(cx, expr, sym::Iterator) && is_expr_untyped_identity_function(cx, flat_map_arg) {
         span_lint_and_sugg(
             cx,
             FLAT_MAP_IDENTITY,

clippy_lints/src/methods/get_first.rs

@@ -1,5 +1,4 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::is_slice_of_primitives;
 use clippy_utils::source::snippet_with_applicability;
 use if_chain::if_chain;
 use rustc_ast::LitKind;
@@ -20,7 +19,6 @@ pub(super) fn check<'tcx>(
         if let Some(method_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
         if let Some(impl_id) = cx.tcx.impl_of_method(method_id);
         if cx.tcx.type_of(impl_id).instantiate_identity().is_slice();
-        if let Some(_) = is_slice_of_primitives(cx, recv);
         if let hir::ExprKind::Lit(Spanned { node: LitKind::Int(0, _), .. }) = arg.kind;
         then {
             let mut app = Applicability::MachineApplicable;

clippy_lints/src/methods/map_identity.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::ty::is_type_diagnostic_item;
-use clippy_utils::{is_expr_identity_function, is_trait_method};
+use clippy_utils::{is_expr_untyped_identity_function, is_trait_method};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -23,7 +23,7 @@ pub(super) fn check(
         if is_trait_method(cx, expr, sym::Iterator)
             || is_type_diagnostic_item(cx, caller_ty, sym::Result)
             || is_type_diagnostic_item(cx, caller_ty, sym::Option);
-        if is_expr_identity_function(cx, map_arg);
+        if is_expr_untyped_identity_function(cx, map_arg);
         if let Some(sugg_span) = expr.span.trim_start(caller.span);
         then {
             span_lint_and_sugg(

clippy_lints/src/methods/search_is_some.rs

@@ -39,7 +39,7 @@ pub(super) fn check<'tcx>(
                 if search_method == "find";
                 if let hir::ExprKind::Closure(&hir::Closure { body, .. }) = search_arg.kind;
                 let closure_body = cx.tcx.hir().body(body);
-                if let Some(closure_arg) = closure_body.params.get(0);
+                if let Some(closure_arg) = closure_body.params.first();
                 then {
                     if let hir::PatKind::Ref(..) = closure_arg.pat.kind {
                         Some(search_snippet.replacen('&', "", 1))

clippy_lints/src/methods/unnecessary_lazy_eval.rs

@@ -2,6 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::is_type_diagnostic_item;
 use clippy_utils::{eager_or_lazy, is_from_proc_macro, usage};
+use hir::FnRetTy;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -27,7 +28,7 @@ pub(super) fn check<'tcx>(
     let is_bool = cx.typeck_results().expr_ty(recv).is_bool();
 
     if is_option || is_result || is_bool {
-        if let hir::ExprKind::Closure(&hir::Closure { body, .. }) = arg.kind {
+        if let hir::ExprKind::Closure(&hir::Closure { body, fn_decl, .. }) = arg.kind {
             let body = cx.tcx.hir().body(body);
             let body_expr = &body.value;
 
@@ -48,7 +49,14 @@ pub(super) fn check<'tcx>(
                     .iter()
                     // bindings are checked to be unused above
                     .all(|param| matches!(param.pat.kind, hir::PatKind::Binding(..) | hir::PatKind::Wild))
-                {
+                    && matches!(
+                        fn_decl.output,
+                        FnRetTy::DefaultReturn(_)
+                            | FnRetTy::Return(hir::Ty {
+                                kind: hir::TyKind::Infer,
+                                ..
+                            })
+                    ) {
                     Applicability::MachineApplicable
                 } else {
                     // replacing the lambda may break type inference

clippy_lints/src/missing_doc.rs

@@ -67,7 +67,7 @@ impl MissingDoc {
         if_chain! {
             if let Some(meta) = meta;
             if let MetaItemKind::List(list) = meta.kind;
-            if let Some(meta) = list.get(0);
+            if let Some(meta) = list.first();
             if let Some(name) = meta.ident();
             then {
                 name.name == sym::include

clippy_lints/src/missing_enforced_import_rename.rs

@@ -17,6 +17,9 @@ declare_clippy_lint! {
     /// Checks for imports that do not rename the item as specified
     /// in the `enforce-import-renames` config option.
     ///
+    /// Note: Even though this lint is warn-by-default, it will only trigger if
+    /// import renames are defined in the clippy.toml file.
+    ///
     /// ### Why is this bad?
     /// Consistency is important, if a project has defined import
     /// renames they should be followed. More practically, some item names are too
@@ -38,7 +41,7 @@ declare_clippy_lint! {
     /// ```
     #[clippy::version = "1.55.0"]
     pub MISSING_ENFORCED_IMPORT_RENAMES,
-    restriction,
+    style,
     "enforce import renames"
 }
 

clippy_lints/src/missing_fields_in_debug.rs

@@ -1,9 +1,9 @@
 use std::ops::ControlFlow;
 
 use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::is_path_lang_item;
 use clippy_utils::ty::is_type_diagnostic_item;
 use clippy_utils::visitors::{for_each_expr, Visitable};
-use clippy_utils::is_path_lang_item;
 use rustc_ast::LitKind;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::{DefKind, Res};

clippy_lints/src/multiple_unsafe_ops_per_block.rs

@@ -9,7 +9,7 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::Span;
+use rustc_span::{DesugaringKind, Span};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -64,7 +64,10 @@ declare_lint_pass!(MultipleUnsafeOpsPerBlock => [MULTIPLE_UNSAFE_OPS_PER_BLOCK])
 
 impl<'tcx> LateLintPass<'tcx> for MultipleUnsafeOpsPerBlock {
     fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
-        if !matches!(block.rules, BlockCheckMode::UnsafeBlock(_)) || in_external_macro(cx.tcx.sess, block.span) {
+        if !matches!(block.rules, BlockCheckMode::UnsafeBlock(_))
+            || in_external_macro(cx.tcx.sess, block.span)
+            || block.span.is_desugaring(DesugaringKind::Await)
+        {
             return;
         }
         let mut unsafe_ops = vec![];

clippy_lints/src/needless_continue.rs

@@ -189,7 +189,7 @@ fn needless_continue_in_else(else_expr: &ast::Expr, label: Option<&ast::Label>)
 }
 
 fn is_first_block_stmt_continue(block: &ast::Block, label: Option<&ast::Label>) -> bool {
-    block.stmts.get(0).map_or(false, |stmt| match stmt.kind {
+    block.stmts.first().map_or(false, |stmt| match stmt.kind {
         ast::StmtKind::Semi(ref e) | ast::StmtKind::Expr(ref e) => {
             if let ast::ExprKind::Continue(ref l) = e.kind {
                 compare_labels(label, l.as_ref())
@@ -434,7 +434,7 @@ fn erode_from_back(s: &str) -> String {
 }
 
 fn span_of_first_expr_in_block(block: &ast::Block) -> Option<Span> {
-    block.stmts.get(0).map(|stmt| stmt.span)
+    block.stmts.first().map(|stmt| stmt.span)
 }
 
 #[cfg(test)]

clippy_lints/src/needless_pass_by_ref_mut.rs

@@ -7,7 +7,8 @@ use rustc_data_structures::fx::{FxHashSet, FxIndexMap};
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_qpath, FnKind, Visitor};
 use rustc_hir::{
-    Body, Closure, Expr, ExprKind, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node, PatKind, QPath,
+    BlockCheckMode, Body, Closure, Expr, ExprKind, FnDecl, HirId, HirIdMap, HirIdSet, Impl, ItemKind, Mutability, Node,
+    PatKind, QPath,
 };
 use rustc_hir_typeck::expr_use_visitor as euv;
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
@@ -139,13 +140,23 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
         let hir_id = cx.tcx.hir().local_def_id_to_hir_id(fn_def_id);
         let is_async = match kind {
             FnKind::ItemFn(.., header) => {
+                if header.is_unsafe() {
+                    // We don't check unsafe functions.
+                    return;
+                }
                 let attrs = cx.tcx.hir().attrs(hir_id);
                 if header.abi != Abi::Rust || requires_exact_signature(attrs) {
                     return;
                 }
                 header.is_async()
             },
-            FnKind::Method(.., sig) => sig.header.is_async(),
+            FnKind::Method(.., sig) => {
+                if sig.header.is_unsafe() {
+                    // We don't check unsafe functions.
+                    return;
+                }
+                sig.header.is_async()
+            },
             FnKind::Closure => return,
         };
 
@@ -186,20 +197,21 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByRefMut<'tcx> {
             };
             let infcx = cx.tcx.infer_ctxt().build();
             euv::ExprUseVisitor::new(&mut ctx, &infcx, fn_def_id, cx.param_env, cx.typeck_results()).consume_body(body);
+
+            let mut checked_closures = FxHashSet::default();
+
+            // We retrieve all the closures declared in the function because they will not be found
+            // by `euv::Delegate`.
+            let mut closures: FxHashSet<LocalDefId> = FxHashSet::default();
+            for_each_expr_with_closures(cx, body, |expr| {
+                if let ExprKind::Closure(closure) = expr.kind {
+                    closures.insert(closure.def_id);
+                }
+                ControlFlow::<()>::Continue(())
+            });
+            check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures);
+
             if is_async {
-                let mut checked_closures = FxHashSet::default();
-
-                // We retrieve all the closures declared in the async function because they will
-                // not be found by `euv::Delegate`.
-                let mut closures: FxHashSet<LocalDefId> = FxHashSet::default();
-                for_each_expr_with_closures(cx, body, |expr| {
-                    if let ExprKind::Closure(closure) = expr.kind {
-                        closures.insert(closure.def_id);
-                    }
-                    ControlFlow::<()>::Continue(())
-                });
-                check_closures(&mut ctx, cx, &infcx, &mut checked_closures, closures);
-
                 while !ctx.async_closures.is_empty() {
                     let async_closures = ctx.async_closures.clone();
                     ctx.async_closures.clear();
@@ -304,10 +316,27 @@ impl<'tcx> MutablyUsedVariablesCtxt<'tcx> {
         }
         self.aliases.insert(alias, target);
     }
+
+    // The goal here is to find if the current scope is unsafe or not. It stops when it finds
+    // a function or an unsafe block.
+    fn is_in_unsafe_block(&self, item: HirId) -> bool {
+        let hir = self.tcx.hir();
+        for (parent, node) in hir.parent_iter(item) {
+            if let Some(fn_sig) = hir.fn_sig_by_hir_id(parent) {
+                return fn_sig.header.is_unsafe();
+            } else if let Node::Block(block) = node {
+                if matches!(block.rules, BlockCheckMode::UnsafeBlock(_)) {
+                    return true;
+                }
+            }
+        }
+        false
+    }
 }
 
 impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt<'tcx> {
-    fn consume(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, _id: HirId) {
+    #[allow(clippy::if_same_then_else)]
+    fn consume(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, id: HirId) {
         if let euv::Place {
             base:
                 euv::PlaceBase::Local(vid)
@@ -327,13 +356,18 @@ impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt<'tcx> {
                 && matches!(base_ty.ref_mutability(), Some(Mutability::Mut))
             {
                 self.add_mutably_used_var(*vid);
+            } else if self.is_in_unsafe_block(id) {
+                // If we are in an unsafe block, any operation on this variable must not be warned
+                // upon!
+                self.add_mutably_used_var(*vid);
             }
             self.prev_bind = None;
             self.prev_move_to_closure.remove(vid);
         }
     }
 
-    fn borrow(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, _id: HirId, borrow: ty::BorrowKind) {
+    #[allow(clippy::if_same_then_else)]
+    fn borrow(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, id: HirId, borrow: ty::BorrowKind) {
         self.prev_bind = None;
         if let euv::Place {
             base:
@@ -355,6 +389,10 @@ impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt<'tcx> {
                 || (borrow == ty::BorrowKind::UniqueImmBorrow && base_ty.ref_mutability() == Some(Mutability::Mut))
             {
                 self.add_mutably_used_var(*vid);
+            } else if self.is_in_unsafe_block(id) {
+                // If we are in an unsafe block, any operation on this variable must not be warned
+                // upon!
+                self.add_mutably_used_var(*vid);
             }
         } else if borrow == ty::ImmBorrow {
             // If there is an `async block`, it'll contain a call to a closure which we need to
@@ -397,7 +435,21 @@ impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt<'tcx> {
         }
     }
 
-    fn copy(&mut self, _cmt: &euv::PlaceWithHirId<'tcx>, _id: HirId) {
+    fn copy(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, id: HirId) {
+        if let euv::Place {
+            base:
+                euv::PlaceBase::Local(vid)
+                | euv::PlaceBase::Upvar(UpvarId {
+                    var_path: UpvarPath { hir_id: vid },
+                    ..
+                }),
+            ..
+        } = &cmt.place
+        {
+            if self.is_in_unsafe_block(id) {
+                self.add_mutably_used_var(*vid);
+            }
+        }
         self.prev_bind = None;
     }
 
@@ -427,8 +479,22 @@ impl<'tcx> euv::Delegate<'tcx> for MutablyUsedVariablesCtxt<'tcx> {
         }
     }
 
-    fn bind(&mut self, _cmt: &euv::PlaceWithHirId<'tcx>, id: HirId) {
+    fn bind(&mut self, cmt: &euv::PlaceWithHirId<'tcx>, id: HirId) {
         self.prev_bind = Some(id);
+        if let euv::Place {
+            base:
+                euv::PlaceBase::Local(vid)
+                | euv::PlaceBase::Upvar(UpvarId {
+                    var_path: UpvarPath { hir_id: vid },
+                    ..
+                }),
+            ..
+        } = &cmt.place
+        {
+            if self.is_in_unsafe_block(id) {
+                self.add_mutably_used_var(*vid);
+            }
+        }
     }
 }
 

clippy_lints/src/needless_pass_by_value.rs

@@ -1,10 +1,10 @@
 use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
+use clippy_utils::is_self;
 use clippy_utils::ptr::get_spans;
 use clippy_utils::source::{snippet, snippet_opt};
 use clippy_utils::ty::{
     implements_trait, implements_trait_with_env_from_iter, is_copy, is_type_diagnostic_item, is_type_lang_item,
 };
-use clippy_utils::is_self;
 use if_chain::if_chain;
 use rustc_ast::ast::Attribute;
 use rustc_errors::{Applicability, Diagnostic};

clippy_lints/src/needless_question_mark.rs

@@ -4,7 +4,7 @@ use clippy_utils::source::snippet;
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{AsyncCoroutineKind, Block, Body, Expr, ExprKind, CoroutineKind, LangItem, MatchSource, QPath};
+use rustc_hir::{AsyncCoroutineKind, Block, Body, CoroutineKind, Expr, ExprKind, LangItem, MatchSource, QPath};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 

clippy_lints/src/non_copy_const.rs

@@ -5,9 +5,10 @@
 use std::ptr;
 
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::in_constant;
 use clippy_utils::macros::macro_backtrace;
+use clippy_utils::{def_path_def_ids, in_constant};
 use if_chain::if_chain;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::def_id::DefId;
 use rustc_hir::{
@@ -15,9 +16,10 @@ use rustc_hir::{
 };
 use rustc_lint::{LateContext, LateLintPass, Lint};
 use rustc_middle::mir::interpret::{ErrorHandled, EvalToValTreeResult, GlobalId};
+use rustc_middle::query::Key;
 use rustc_middle::ty::adjustment::Adjust;
 use rustc_middle::ty::{self, Ty, TyCtxt};
-use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::{sym, InnerSpan, Span};
 use rustc_target::abi::VariantIdx;
 
@@ -126,128 +128,6 @@ declare_clippy_lint! {
     "referencing `const` with interior mutability"
 }
 
-fn is_unfrozen<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
-    // Ignore types whose layout is unknown since `is_freeze` reports every generic types as `!Freeze`,
-    // making it indistinguishable from `UnsafeCell`. i.e. it isn't a tool to prove a type is
-    // 'unfrozen'. However, this code causes a false negative in which
-    // a type contains a layout-unknown type, but also an unsafe cell like `const CELL: Cell<T>`.
-    // Yet, it's better than `ty.has_type_flags(TypeFlags::HAS_TY_PARAM | TypeFlags::HAS_PROJECTION)`
-    // since it works when a pointer indirection involves (`Cell<*const T>`).
-    // Making up a `ParamEnv` where every generic params and assoc types are `Freeze`is another option;
-    // but I'm not sure whether it's a decent way, if possible.
-    cx.tcx.layout_of(cx.param_env.and(ty)).is_ok() && !ty.is_freeze(cx.tcx, cx.param_env)
-}
-
-fn is_value_unfrozen_raw<'tcx>(
-    cx: &LateContext<'tcx>,
-    result: Result<Option<ty::ValTree<'tcx>>, ErrorHandled>,
-    ty: Ty<'tcx>,
-) -> bool {
-    fn inner<'tcx>(cx: &LateContext<'tcx>, val: ty::ValTree<'tcx>, ty: Ty<'tcx>) -> bool {
-        match *ty.kind() {
-            // the fact that we have to dig into every structs to search enums
-            // leads us to the point checking `UnsafeCell` directly is the only option.
-            ty::Adt(ty_def, ..) if ty_def.is_unsafe_cell() => true,
-            // As of 2022-09-08 miri doesn't track which union field is active so there's no safe way to check the
-            // contained value.
-            ty::Adt(def, ..) if def.is_union() => false,
-            ty::Array(ty, _) => val.unwrap_branch().iter().any(|field| inner(cx, *field, ty)),
-            ty::Adt(def, _) if def.is_union() => false,
-            ty::Adt(def, args) if def.is_enum() => {
-                let (&variant_index, fields) = val.unwrap_branch().split_first().unwrap();
-                let variant_index = VariantIdx::from_u32(variant_index.unwrap_leaf().try_to_u32().ok().unwrap());
-                fields
-                    .iter()
-                    .copied()
-                    .zip(
-                        def.variants()[variant_index]
-                            .fields
-                            .iter()
-                            .map(|field| field.ty(cx.tcx, args)),
-                    )
-                    .any(|(field, ty)| inner(cx, field, ty))
-            },
-            ty::Adt(def, args) => val
-                .unwrap_branch()
-                .iter()
-                .zip(def.non_enum_variant().fields.iter().map(|field| field.ty(cx.tcx, args)))
-                .any(|(field, ty)| inner(cx, *field, ty)),
-            ty::Tuple(tys) => val
-                .unwrap_branch()
-                .iter()
-                .zip(tys)
-                .any(|(field, ty)| inner(cx, *field, ty)),
-            _ => false,
-        }
-    }
-    result.map_or_else(
-        |err| {
-            // Consider `TooGeneric` cases as being unfrozen.
-            // This causes a false positive where an assoc const whose type is unfrozen
-            // have a value that is a frozen variant with a generic param (an example is
-            // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::GENERIC_VARIANT`).
-            // However, it prevents a number of false negatives that is, I think, important:
-            // 1. assoc consts in trait defs referring to consts of themselves (an example is
-            //    `declare_interior_mutable_const::traits::ConcreteTypes::ANOTHER_ATOMIC`).
-            // 2. a path expr referring to assoc consts whose type is doesn't have any frozen variants in trait
-            //    defs (i.e. without substitute for `Self`). (e.g. borrowing
-            //    `borrow_interior_mutable_const::trait::ConcreteTypes::ATOMIC`)
-            // 3. similar to the false positive above; but the value is an unfrozen variant, or the type has no
-            //    enums. (An example is
-            //    `declare_interior_mutable_const::enums::BothOfCellAndGeneric::UNFROZEN_VARIANT` and
-            //    `declare_interior_mutable_const::enums::BothOfCellAndGeneric::NO_ENUM`).
-            // One might be able to prevent these FNs correctly, and replace this with `false`;
-            // e.g. implementing `has_frozen_variant` described above, and not running this function
-            // when the type doesn't have any frozen variants would be the 'correct' way for the 2nd
-            // case (that actually removes another suboptimal behavior (I won't say 'false positive') where,
-            // similar to 2., but with the a frozen variant) (e.g. borrowing
-            // `borrow_interior_mutable_const::enums::AssocConsts::TO_BE_FROZEN_VARIANT`).
-            // I chose this way because unfrozen enums as assoc consts are rare (or, hopefully, none).
-            matches!(err, ErrorHandled::TooGeneric(..))
-        },
-        |val| val.map_or(true, |val| inner(cx, val, ty)),
-    )
-}
-
-fn is_value_unfrozen_poly<'tcx>(cx: &LateContext<'tcx>, body_id: BodyId, ty: Ty<'tcx>) -> bool {
-    let def_id = body_id.hir_id.owner.to_def_id();
-    let args = ty::GenericArgs::identity_for_item(cx.tcx, def_id);
-    let instance = ty::Instance::new(def_id, args);
-    let cid = rustc_middle::mir::interpret::GlobalId {
-        instance,
-        promoted: None,
-    };
-    let param_env = cx.tcx.param_env(def_id).with_reveal_all_normalized(cx.tcx);
-    let result = cx.tcx.const_eval_global_id_for_typeck(param_env, cid, None);
-    is_value_unfrozen_raw(cx, result, ty)
-}
-
-fn is_value_unfrozen_expr<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId, def_id: DefId, ty: Ty<'tcx>) -> bool {
-    let args = cx.typeck_results().node_args(hir_id);
-
-    let result = const_eval_resolve(cx.tcx, cx.param_env, ty::UnevaluatedConst::new(def_id, args), None);
-    is_value_unfrozen_raw(cx, result, ty)
-}
-
-pub fn const_eval_resolve<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    param_env: ty::ParamEnv<'tcx>,
-    ct: ty::UnevaluatedConst<'tcx>,
-    span: Option<Span>,
-) -> EvalToValTreeResult<'tcx> {
-    match ty::Instance::resolve(tcx, param_env, ct.def, ct.args) {
-        Ok(Some(instance)) => {
-            let cid = GlobalId {
-                instance,
-                promoted: None,
-            };
-            tcx.const_eval_global_id_for_typeck(param_env, cid, span)
-        },
-        Ok(None) => Err(ErrorHandled::TooGeneric(span.unwrap_or(rustc_span::DUMMY_SP))),
-        Err(err) => Err(ErrorHandled::Reported(err.into(), span.unwrap_or(rustc_span::DUMMY_SP))),
-    }
-}
-
 #[derive(Copy, Clone)]
 enum Source {
     Item { item: Span },
@@ -292,13 +172,178 @@ fn lint(cx: &LateContext<'_>, source: Source) {
     });
 }
 
-declare_lint_pass!(NonCopyConst => [DECLARE_INTERIOR_MUTABLE_CONST, BORROW_INTERIOR_MUTABLE_CONST]);
+#[derive(Clone)]
+pub struct NonCopyConst {
+    ignore_interior_mutability: Vec<String>,
+    ignore_mut_def_ids: FxHashSet<DefId>,
+}
+
+impl_lint_pass!(NonCopyConst => [DECLARE_INTERIOR_MUTABLE_CONST, BORROW_INTERIOR_MUTABLE_CONST]);
+
+impl NonCopyConst {
+    pub fn new(ignore_interior_mutability: Vec<String>) -> Self {
+        Self {
+            ignore_interior_mutability,
+            ignore_mut_def_ids: FxHashSet::default(),
+        }
+    }
+
+    fn is_ty_ignored(&self, ty: Ty<'_>) -> bool {
+        matches!(ty.ty_adt_id(), Some(adt_id) if self.ignore_mut_def_ids.contains(&adt_id))
+    }
+
+    fn is_unfrozen<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+        // Ignore types whose layout is unknown since `is_freeze` reports every generic types as `!Freeze`,
+        // making it indistinguishable from `UnsafeCell`. i.e. it isn't a tool to prove a type is
+        // 'unfrozen'. However, this code causes a false negative in which
+        // a type contains a layout-unknown type, but also an unsafe cell like `const CELL: Cell<T>`.
+        // Yet, it's better than `ty.has_type_flags(TypeFlags::HAS_TY_PARAM | TypeFlags::HAS_PROJECTION)`
+        // since it works when a pointer indirection involves (`Cell<*const T>`).
+        // Making up a `ParamEnv` where every generic params and assoc types are `Freeze`is another option;
+        // but I'm not sure whether it's a decent way, if possible.
+        cx.tcx.layout_of(cx.param_env.and(ty)).is_ok() && !ty.is_freeze(cx.tcx, cx.param_env)
+    }
+
+    fn is_value_unfrozen_raw_inner<'tcx>(&self, cx: &LateContext<'tcx>, val: ty::ValTree<'tcx>, ty: Ty<'tcx>) -> bool {
+        if self.is_ty_ignored(ty) {
+            return false;
+        }
+        match *ty.kind() {
+            // the fact that we have to dig into every structs to search enums
+            // leads us to the point checking `UnsafeCell` directly is the only option.
+            ty::Adt(ty_def, ..) if ty_def.is_unsafe_cell() => true,
+            // As of 2022-09-08 miri doesn't track which union field is active so there's no safe way to check the
+            // contained value.
+            ty::Adt(def, ..) if def.is_union() => false,
+            ty::Array(ty, _) => val
+                .unwrap_branch()
+                .iter()
+                .any(|field| self.is_value_unfrozen_raw_inner(cx, *field, ty)),
+            ty::Adt(def, _) if def.is_union() => false,
+            ty::Adt(def, args) if def.is_enum() => {
+                let (&variant_index, fields) = val.unwrap_branch().split_first().unwrap();
+                let variant_index = VariantIdx::from_u32(variant_index.unwrap_leaf().try_to_u32().ok().unwrap());
+                fields
+                    .iter()
+                    .copied()
+                    .zip(
+                        def.variants()[variant_index]
+                            .fields
+                            .iter()
+                            .map(|field| field.ty(cx.tcx, args)),
+                    )
+                    .any(|(field, ty)| self.is_value_unfrozen_raw_inner(cx, field, ty))
+            },
+            ty::Adt(def, args) => val
+                .unwrap_branch()
+                .iter()
+                .zip(def.non_enum_variant().fields.iter().map(|field| field.ty(cx.tcx, args)))
+                .any(|(field, ty)| self.is_value_unfrozen_raw_inner(cx, *field, ty)),
+            ty::Tuple(tys) => val
+                .unwrap_branch()
+                .iter()
+                .zip(tys)
+                .any(|(field, ty)| self.is_value_unfrozen_raw_inner(cx, *field, ty)),
+            _ => false,
+        }
+    }
+
+    fn is_value_unfrozen_raw<'tcx>(
+        &self,
+        cx: &LateContext<'tcx>,
+        result: Result<Option<ty::ValTree<'tcx>>, ErrorHandled>,
+        ty: Ty<'tcx>,
+    ) -> bool {
+        result.map_or_else(
+            |err| {
+                // Consider `TooGeneric` cases as being unfrozen.
+                // This causes a false positive where an assoc const whose type is unfrozen
+                // have a value that is a frozen variant with a generic param (an example is
+                // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::GENERIC_VARIANT`).
+                // However, it prevents a number of false negatives that is, I think, important:
+                // 1. assoc consts in trait defs referring to consts of themselves (an example is
+                //    `declare_interior_mutable_const::traits::ConcreteTypes::ANOTHER_ATOMIC`).
+                // 2. a path expr referring to assoc consts whose type is doesn't have any frozen variants in trait
+                //    defs (i.e. without substitute for `Self`). (e.g. borrowing
+                //    `borrow_interior_mutable_const::trait::ConcreteTypes::ATOMIC`)
+                // 3. similar to the false positive above; but the value is an unfrozen variant, or the type has no
+                //    enums. (An example is
+                //    `declare_interior_mutable_const::enums::BothOfCellAndGeneric::UNFROZEN_VARIANT` and
+                //    `declare_interior_mutable_const::enums::BothOfCellAndGeneric::NO_ENUM`).
+                // One might be able to prevent these FNs correctly, and replace this with `false`;
+                // e.g. implementing `has_frozen_variant` described above, and not running this function
+                // when the type doesn't have any frozen variants would be the 'correct' way for the 2nd
+                // case (that actually removes another suboptimal behavior (I won't say 'false positive') where,
+                // similar to 2., but with the a frozen variant) (e.g. borrowing
+                // `borrow_interior_mutable_const::enums::AssocConsts::TO_BE_FROZEN_VARIANT`).
+                // I chose this way because unfrozen enums as assoc consts are rare (or, hopefully, none).
+                matches!(err, ErrorHandled::TooGeneric(..))
+            },
+            |val| val.map_or(true, |val| self.is_value_unfrozen_raw_inner(cx, val, ty)),
+        )
+    }
+
+    fn is_value_unfrozen_poly<'tcx>(&self, cx: &LateContext<'tcx>, body_id: BodyId, ty: Ty<'tcx>) -> bool {
+        let def_id = body_id.hir_id.owner.to_def_id();
+        let args = ty::GenericArgs::identity_for_item(cx.tcx, def_id);
+        let instance = ty::Instance::new(def_id, args);
+        let cid = rustc_middle::mir::interpret::GlobalId {
+            instance,
+            promoted: None,
+        };
+        let param_env = cx.tcx.param_env(def_id).with_reveal_all_normalized(cx.tcx);
+        let result = cx.tcx.const_eval_global_id_for_typeck(param_env, cid, None);
+        self.is_value_unfrozen_raw(cx, result, ty)
+    }
+
+    fn is_value_unfrozen_expr<'tcx>(&self, cx: &LateContext<'tcx>, hir_id: HirId, def_id: DefId, ty: Ty<'tcx>) -> bool {
+        let args = cx.typeck_results().node_args(hir_id);
+
+        let result = Self::const_eval_resolve(cx.tcx, cx.param_env, ty::UnevaluatedConst::new(def_id, args), None);
+        self.is_value_unfrozen_raw(cx, result, ty)
+    }
+
+    pub fn const_eval_resolve<'tcx>(
+        tcx: TyCtxt<'tcx>,
+        param_env: ty::ParamEnv<'tcx>,
+        ct: ty::UnevaluatedConst<'tcx>,
+        span: Option<Span>,
+    ) -> EvalToValTreeResult<'tcx> {
+        match ty::Instance::resolve(tcx, param_env, ct.def, ct.args) {
+            Ok(Some(instance)) => {
+                let cid = GlobalId {
+                    instance,
+                    promoted: None,
+                };
+                tcx.const_eval_global_id_for_typeck(param_env, cid, span)
+            },
+            Ok(None) => Err(ErrorHandled::TooGeneric(span.unwrap_or(rustc_span::DUMMY_SP))),
+            Err(err) => Err(ErrorHandled::Reported(err.into(), span.unwrap_or(rustc_span::DUMMY_SP))),
+        }
+    }
+}
 
 impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
+    fn check_crate(&mut self, cx: &LateContext<'tcx>) {
+        self.ignore_mut_def_ids.clear();
+        let mut path = Vec::new();
+        for ty in &self.ignore_interior_mutability {
+            path.extend(ty.split("::"));
+            for id in def_path_def_ids(cx, &path[..]) {
+                self.ignore_mut_def_ids.insert(id);
+            }
+            path.clear();
+        }
+    }
+
     fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx Item<'_>) {
         if let ItemKind::Const(.., body_id) = it.kind {
             let ty = cx.tcx.type_of(it.owner_id).instantiate_identity();
-            if !ignored_macro(cx, it) && is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, body_id, ty) {
+            if !ignored_macro(cx, it)
+                && !self.is_ty_ignored(ty)
+                && Self::is_unfrozen(cx, ty)
+                && self.is_value_unfrozen_poly(cx, body_id, ty)
+            {
                 lint(cx, Source::Item { item: it.span });
             }
         }
@@ -311,7 +356,7 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
             // Normalize assoc types because ones originated from generic params
             // bounded other traits could have their bound.
             let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
-            if is_unfrozen(cx, normalized)
+            if !self.is_ty_ignored(ty) && Self::is_unfrozen(cx, normalized)
                 // When there's no default value, lint it only according to its type;
                 // in other words, lint consts whose value *could* be unfrozen, not definitely is.
                 // This feels inconsistent with how the lint treats generic types,
@@ -324,7 +369,7 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
                 // i.e. having an enum doesn't necessary mean a type has a frozen variant.
                 // And, implementing it isn't a trivial task; it'll probably end up
                 // re-implementing the trait predicate evaluation specific to `Freeze`.
-                && body_id_opt.map_or(true, |body_id| is_value_unfrozen_poly(cx, body_id, normalized))
+                && body_id_opt.map_or(true, |body_id| self.is_value_unfrozen_poly(cx, body_id, normalized))
             {
                 lint(cx, Source::Assoc { item: trait_item.span });
             }
@@ -367,8 +412,8 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
                             // e.g. `layout_of(...).is_err() || has_frozen_variant(...);`
                         let ty = cx.tcx.type_of(impl_item.owner_id).instantiate_identity();
                         let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
-                        if is_unfrozen(cx, normalized);
+                        if !self.is_ty_ignored(ty) && Self::is_unfrozen(cx, normalized);
-                        if is_value_unfrozen_poly(cx, *body_id, normalized);
+                        if self.is_value_unfrozen_poly(cx, *body_id, normalized);
                         then {
                             lint(
                                cx,
@@ -384,7 +429,10 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
                     // Normalize assoc types originated from generic params.
                     let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
 
-                    if is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, *body_id, normalized) {
+                    if !self.is_ty_ignored(ty)
+                        && Self::is_unfrozen(cx, ty)
+                        && self.is_value_unfrozen_poly(cx, *body_id, normalized)
+                    {
                         lint(cx, Source::Assoc { item: impl_item.span });
                     }
                 },
@@ -478,7 +526,10 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
                 cx.typeck_results().expr_ty(dereferenced_expr)
             };
 
-            if is_unfrozen(cx, ty) && is_value_unfrozen_expr(cx, expr.hir_id, item_def_id, ty) {
+            if !self.is_ty_ignored(ty)
+                && Self::is_unfrozen(cx, ty)
+                && self.is_value_unfrozen_expr(cx, expr.hir_id, item_def_id, ty)
+            {
                 lint(cx, Source::Expr { expr: expr.span });
             }
         }

clippy_lints/src/non_send_fields_in_send_ty.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::is_lint_allowed;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::{implements_trait, is_copy};
-use clippy_utils::is_lint_allowed;
 use rustc_ast::ImplPolarity;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{FieldDef, Item, ItemKind, Node};

clippy_lints/src/only_used_in_recursion.rs

@@ -134,6 +134,7 @@ impl Usage {
 /// The parameters being checked by the lint, indexed by both the parameter's `HirId` and the
 /// `DefId` of the function paired with the parameter's index.
 #[derive(Default)]
+#[allow(clippy::struct_field_names)]
 struct Params {
     params: Vec<Param>,
     by_id: HirIdMap<usize>,

clippy_lints/src/operators/cmp_owned.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::path_def_id;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::{implements_trait, is_copy};
-use clippy_utils::path_def_id;
 use rustc_errors::Applicability;
 use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
 use rustc_lint::LateContext;

clippy_lints/src/rc_clone_in_vec_init.rs

@@ -1,8 +1,8 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::higher::VecArgs;
+use clippy_utils::last_path_segment;
 use clippy_utils::macros::root_macro_call_first_node;
 use clippy_utils::source::{indent_of, snippet};
-use clippy_utils::last_path_segment;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/redundant_async_block.rs

@@ -5,7 +5,7 @@ use clippy_utils::peel_blocks;
 use clippy_utils::source::{snippet, walk_span_to_context};
 use clippy_utils::visitors::for_each_expr;
 use rustc_errors::Applicability;
-use rustc_hir::{AsyncCoroutineKind, Closure, Expr, ExprKind, CoroutineKind, MatchSource};
+use rustc_hir::{AsyncCoroutineKind, Closure, CoroutineKind, Expr, ExprKind, MatchSource};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::UpvarCapture;

clippy_lints/src/redundant_locals.rs

@@ -62,7 +62,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantLocals {
             if let Res::Local(binding_id) = cx.qpath_res(&qpath, expr.hir_id);
             if let Node::Pat(binding_pat) = cx.tcx.hir().get(binding_id);
             // the previous binding has the same mutability
-            if find_binding(binding_pat, ident).unwrap().1 == mutability;
+            if find_binding(binding_pat, ident).is_some_and(|bind| bind.1 == mutability);
             // the local does not change the effect of assignments to the binding. see #11290
             if !affects_assignments(cx, mutability, binding_id, local.hir_id);
             // the local does not affect the code's drop behavior

clippy_lints/src/slow_vector_initialization.rs

@@ -335,7 +335,7 @@ impl<'a, 'tcx> Visitor<'tcx> for VectorInitializationVisitor<'a, 'tcx> {
 
     fn visit_block(&mut self, block: &'tcx Block<'_>) {
         if self.initialization_found {
-            if let Some(s) = block.stmts.get(0) {
+            if let Some(s) = block.stmts.first() {
                 self.visit_stmt(s);
             }
 

clippy_lints/src/swap_ptr_to_ref.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::source::snippet_with_context;
 use clippy_utils::path_def_id;
+use clippy_utils::source::snippet_with_context;
 use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, UnOp};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/types/mod.rs

@@ -578,7 +578,7 @@ impl Types {
     }
 }
 
-#[allow(clippy::struct_excessive_bools)]
+#[allow(clippy::struct_excessive_bools, clippy::struct_field_names)]
 #[derive(Clone, Copy, Default)]
 struct CheckTyContext {
     is_in_trait_impl: bool,

clippy_lints/src/uninit_vec.rs

@@ -201,7 +201,7 @@ fn extract_set_len_self<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Opt
     let expr = peel_hir_expr_while(expr, |e| {
         if let ExprKind::Block(block, _) = e.kind {
             // Extract the first statement/expression
-            match (block.stmts.get(0).map(|stmt| &stmt.kind), block.expr) {
+            match (block.stmts.first().map(|stmt| &stmt.kind), block.expr) {
                 (None, Some(expr)) => Some(expr),
                 (Some(StmtKind::Expr(expr) | StmtKind::Semi(expr)), _) => Some(expr),
                 _ => None,

clippy_lints/src/unnecessary_map_on_constructor.rs

@@ -40,7 +40,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMapOnConstructor {
             let (constructor_path, constructor_item) =
                 if let hir::ExprKind::Call(constructor, constructor_args) = recv.kind
                     && let hir::ExprKind::Path(constructor_path) = constructor.kind
-                    && let Some(arg) = constructor_args.get(0)
+                    && let Some(arg) = constructor_args.first()
                 {
                     if constructor.span.from_expansion() || arg.span.from_expansion() {
                         return;
@@ -66,7 +66,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMapOnConstructor {
                 _ => return,
             }
 
-            if let Some(map_arg) = args.get(0)
+            if let Some(map_arg) = args.first()
                 && let hir::ExprKind::Path(fun) = map_arg.kind
             {
                 if map_arg.span.from_expansion() {

clippy_lints/src/use_self.rs

@@ -54,7 +54,6 @@ declare_clippy_lint! {
     "unnecessary structure name repetition whereas `Self` is applicable"
 }
 
-#[derive(Default)]
 pub struct UseSelf {
     msrv: Msrv,
     stack: Vec<StackItem>,
@@ -65,7 +64,7 @@ impl UseSelf {
     pub fn new(msrv: Msrv) -> Self {
         Self {
             msrv,
-            ..Self::default()
+            stack: Vec::new(),
         }
     }
 }

clippy_lints/src/utils/author.rs

@@ -268,8 +268,8 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
     fn qpath(&self, qpath: &Binding<&QPath<'_>>) {
         if let QPath::LangItem(lang_item, ..) = *qpath.value {
             chain!(self, "matches!({qpath}, QPath::LangItem(LangItem::{lang_item:?}, _))");
-        } else {
+        } else if let Ok(path) = path_to_string(qpath.value) {
-            chain!(self, "match_qpath({qpath}, &[{}])", path_to_string(qpath.value));
+            chain!(self, "match_qpath({qpath}, &[{}])", path);
         }
     }
 
@@ -738,8 +738,8 @@ fn has_attr(cx: &LateContext<'_>, hir_id: hir::HirId) -> bool {
     get_attr(cx.sess(), attrs, "author").count() > 0
 }
 
-fn path_to_string(path: &QPath<'_>) -> String {
+fn path_to_string(path: &QPath<'_>) -> Result<String, ()> {
-    fn inner(s: &mut String, path: &QPath<'_>) {
+    fn inner(s: &mut String, path: &QPath<'_>) -> Result<(), ()> {
         match *path {
             QPath::Resolved(_, path) => {
                 for (i, segment) in path.segments.iter().enumerate() {
@@ -751,16 +751,18 @@ fn path_to_string(path: &QPath<'_>) -> String {
             },
             QPath::TypeRelative(ty, segment) => match &ty.kind {
                 hir::TyKind::Path(inner_path) => {
-                    inner(s, inner_path);
+                    inner(s, inner_path)?;
                     *s += ", ";
                     write!(s, "{:?}", segment.ident.as_str()).unwrap();
                 },
                 other => write!(s, "/* unimplemented: {other:?}*/").unwrap(),
             },
-            QPath::LangItem(..) => panic!("path_to_string: called for lang item qpath"),
+            QPath::LangItem(..) => return Err(()),
         }
+
+        Ok(())
     }
     let mut s = String::new();
-    inner(&mut s, path);
+    inner(&mut s, path)?;
-    s
+    Ok(s)
 }

clippy_lints/src/utils/conf.rs

@@ -8,8 +8,9 @@ use serde::de::{Deserializer, IgnoredAny, IntoDeserializer, MapAccess, Visitor};
 use serde::Deserialize;
 use std::fmt::{Debug, Display, Formatter};
 use std::ops::Range;
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 use std::str::FromStr;
+use std::sync::OnceLock;
 use std::{cmp, env, fmt, fs, io};
 
 #[rustfmt::skip]
@@ -78,62 +79,35 @@ pub struct TryConf {
 
 impl TryConf {
     fn from_toml_error(file: &SourceFile, error: &toml::de::Error) -> Self {
-        ConfError::from_toml(file, error).into()
-    }
-}
-
-impl From<ConfError> for TryConf {
-    fn from(value: ConfError) -> Self {
         Self {
             conf: Conf::default(),
-            errors: vec![value],
+            errors: vec![ConfError::from_toml(file, error)],
             warnings: vec![],
         }
     }
 }
 
-impl From<io::Error> for TryConf {
-    fn from(value: io::Error) -> Self {
-        ConfError::from(value).into()
-    }
-}
-
 #[derive(Debug)]
 pub struct ConfError {
     pub message: String,
-    pub span: Option<Span>,
+    pub span: Span,
 }
 
 impl ConfError {
     fn from_toml(file: &SourceFile, error: &toml::de::Error) -> Self {
-        if let Some(span) = error.span() {
+        let span = error.span().unwrap_or(0..file.source_len.0 as usize);
-            Self::spanned(file, error.message(), span)
+        Self::spanned(file, error.message(), span)
-        } else {
-            Self {
-                message: error.message().to_string(),
-                span: None,
-            }
-        }
     }
 
     fn spanned(file: &SourceFile, message: impl Into<String>, span: Range<usize>) -> Self {
         Self {
             message: message.into(),
-            span: Some(Span::new(
+            span: Span::new(
                 file.start_pos + BytePos::from_usize(span.start),
                 file.start_pos + BytePos::from_usize(span.end),
                 SyntaxContext::root(),
                 None,
-            )),
+            ),
-        }
-    }
-}
-
-impl From<io::Error> for ConfError {
-    fn from(value: io::Error) -> Self {
-        Self {
-            message: value.to_string(),
-            span: None,
         }
     }
 }
@@ -297,7 +271,7 @@ define_Conf! {
     /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, OPTION_MAP_UNWRAP_OR, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED, UNINLINED_FORMAT_ARGS, MANUAL_CLAMP, MANUAL_LET_ELSE, UNCHECKED_DURATION_SUBTRACTION, COLLAPSIBLE_STR_REPLACE, SEEK_FROM_CURRENT, SEEK_REWIND, UNNECESSARY_LAZY_EVALUATIONS, TRANSMUTE_PTR_TO_REF, ALMOST_COMPLETE_RANGE, NEEDLESS_BORROW, DERIVABLE_IMPLS, MANUAL_IS_ASCII_CHECK, MANUAL_REM_EUCLID, MANUAL_RETAIN, TYPE_REPETITION_IN_BOUNDS, TUPLE_ARRAY_CONVERSIONS, MANUAL_TRY_FOLD, MANUAL_HASH_ONE.
     ///
     /// The minimum rust version that the project supports
-    (msrv: Option<String> = None),
+    (msrv: crate::Msrv = crate::Msrv::empty()),
     /// DEPRECATED LINT: BLACKLISTED_NAME.
     ///
     /// Use the Disallowed Names lint instead
@@ -360,6 +334,10 @@ define_Conf! {
     ///
     /// The minimum number of enum variants for the lints about variant names to trigger
     (enum_variant_name_threshold: u64 = 3),
+    /// Lint: STRUCT_VARIANT_NAMES.
+    ///
+    /// The minimum number of struct fields for the lints about field names to trigger
+    (struct_field_name_threshold: u64 = 3),
     /// Lint: LARGE_ENUM_VARIANT.
     ///
     /// The maximum size of an enum's variant to avoid box suggestion
@@ -641,15 +619,8 @@ pub fn lookup_conf_file() -> io::Result<(Option<PathBuf>, Vec<String>)> {
     }
 }
 
-/// Read the `toml` configuration file.
+fn deserialize(file: &SourceFile) -> TryConf {
-///
+    match toml::de::Deserializer::new(file.src.as_ref().unwrap()).deserialize_map(ConfVisitor(file)) {
-/// In case of error, the function tries to continue as much as possible.
-pub fn read(sess: &Session, path: &Path) -> TryConf {
-    let file = match sess.source_map().load_file(path) {
-        Err(e) => return e.into(),
-        Ok(file) => file,
-    };
-    match toml::de::Deserializer::new(file.src.as_ref().unwrap()).deserialize_map(ConfVisitor(&file)) {
         Ok(mut conf) => {
             extend_vec_if_indicator_present(&mut conf.conf.doc_valid_idents, DEFAULT_DOC_VALID_IDENTS);
             extend_vec_if_indicator_present(&mut conf.conf.disallowed_names, DEFAULT_DISALLOWED_NAMES);
@@ -662,7 +633,7 @@ pub fn read(sess: &Session, path: &Path) -> TryConf {
 
             conf
         },
-        Err(e) => TryConf::from_toml_error(&file, &e),
+        Err(e) => TryConf::from_toml_error(file, &e),
     }
 }
 
@@ -672,6 +643,60 @@ fn extend_vec_if_indicator_present(vec: &mut Vec<String>, default: &[&str]) {
     }
 }
 
+impl Conf {
+    pub fn read(sess: &Session, path: &io::Result<(Option<PathBuf>, Vec<String>)>) -> &'static Conf {
+        static CONF: OnceLock<Conf> = OnceLock::new();
+        CONF.get_or_init(|| Conf::read_inner(sess, path))
+    }
+
+    fn read_inner(sess: &Session, path: &io::Result<(Option<PathBuf>, Vec<String>)>) -> Conf {
+        match path {
+            Ok((_, warnings)) => {
+                for warning in warnings {
+                    sess.warn(warning.clone());
+                }
+            },
+            Err(error) => {
+                sess.err(format!("error finding Clippy's configuration file: {error}"));
+            },
+        }
+
+        let TryConf {
+            mut conf,
+            errors,
+            warnings,
+        } = match path {
+            Ok((Some(path), _)) => match sess.source_map().load_file(path) {
+                Ok(file) => deserialize(&file),
+                Err(error) => {
+                    sess.err(format!("failed to read `{}`: {error}", path.display()));
+                    TryConf::default()
+                },
+            },
+            _ => TryConf::default(),
+        };
+
+        conf.msrv.read_cargo(sess);
+
+        // all conf errors are non-fatal, we just use the default conf in case of error
+        for error in errors {
+            sess.span_err(
+                error.span,
+                format!("error reading Clippy's configuration file: {}", error.message),
+            );
+        }
+
+        for warning in warnings {
+            sess.span_warn(
+                warning.span,
+                format!("error reading Clippy's configuration file: {}", warning.message),
+            );
+        }
+
+        conf
+    }
+}
+
 const SEPARATOR_WIDTH: usize = 4;
 
 #[derive(Debug)]

clippy_lints/src/utils/internal_lints/if_chain_style.rs

@@ -30,7 +30,7 @@ impl<'tcx> LateLintPass<'tcx> for IfChainStyle {
                 if_chain_local_span(cx, local, if_chain_span),
                 "`let` expression should be above the `if_chain!`",
             );
-        } else if local.span.ctxt() == block.span.ctxt() && is_if_chain_then(after, block.expr, if_chain_span) {
+        } else if local.span.eq_ctxt(block.span) && is_if_chain_then(after, block.expr, if_chain_span) {
             span_lint(
                 cx,
                 IF_CHAIN_STYLE,

clippy_lints/src/utils/internal_lints/interning_defined_symbol.rs

@@ -13,6 +13,7 @@ use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir::ConstValue;
 use rustc_middle::ty;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::sym;
 use rustc_span::symbol::Symbol;
 
 use std::borrow::Cow;
@@ -160,12 +161,8 @@ impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
 
 impl InterningDefinedSymbol {
     fn symbol_str_expr<'tcx>(&self, expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> Option<SymbolStrExpr<'tcx>> {
-        static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR, &paths::TO_STRING_METHOD];
+        static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR];
-        static SYMBOL_STR_PATHS: &[&[&str]] = &[
+        static SYMBOL_STR_PATHS: &[&[&str]] = &[&paths::SYMBOL_AS_STR, &paths::SYMBOL_TO_IDENT_STRING];
-            &paths::SYMBOL_AS_STR,
-            &paths::SYMBOL_TO_IDENT_STRING,
-            &paths::TO_STRING_METHOD,
-        ];
         let call = if_chain! {
             if let ExprKind::AddrOf(_, _, e) = expr.kind;
             if let ExprKind::Unary(UnOp::Deref, e) = e.kind;
@@ -186,9 +183,19 @@ impl InterningDefinedSymbol {
             };
             // ...which converts it to a string
             let paths = if is_ident { IDENT_STR_PATHS } else { SYMBOL_STR_PATHS };
-            if let Some(path) = paths.iter().find(|path| match_def_path(cx, did, path));
+            if let Some(is_to_owned) = paths
+                .iter()
+                .find_map(|path| if match_def_path(cx, did, path) {
+                    Some(path == &paths::SYMBOL_TO_IDENT_STRING)
+                } else {
+                    None
+                })
+                .or_else(|| if cx.tcx.is_diagnostic_item(sym::to_string_method, did) {
+                    Some(true)
+                } else {
+                    None
+                });
             then {
-                let is_to_owned = path.last().unwrap().ends_with("string");
                 return Some(SymbolStrExpr::Expr {
                     item,
                     is_ident,

clippy_utils/Cargo.toml

@@ -9,6 +9,7 @@ arrayvec = { version = "0.7", default-features = false }
 if_chain = "1.0"
 itertools = "0.10.1"
 rustc-semver = "1.1"
+serde = { version = "1.0" }
 
 [features]
 deny-warnings = []

clippy_utils/src/consts.rs

@@ -504,7 +504,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
             },
             (Some(Constant::Vec(vec)), _) => {
                 if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
-                    match vec.get(0) {
+                    match vec.first() {
                         Some(Constant::F32(x)) => Some(Constant::F32(*x)),
                         Some(Constant::F64(x)) => Some(Constant::F64(*x)),
                         _ => None,

clippy_utils/src/higher.rs

@@ -449,7 +449,7 @@ pub fn get_vec_init_kind<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -
                 } else if name.ident.name == symbol::kw::Default {
                     return Some(VecInitKind::Default);
                 } else if name.ident.name.as_str() == "with_capacity" {
-                    let arg = args.get(0)?;
+                    let arg = args.first()?;
                     return match constant_simple(cx, cx.typeck_results(), arg) {
                         Some(Constant::Int(num)) => Some(VecInitKind::WithConstCapacity(num)),
                         _ => Some(VecInitKind::WithExprCapacity(arg.hir_id)),

clippy_utils/src/lib.rs

@@ -2027,48 +2027,88 @@ pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     did.map_or(false, |did| cx.tcx.has_attr(did, sym::must_use))
 }
 
-/// Checks if an expression represents the identity function
+/// Checks if a function's body represents the identity function. Looks for bodies of the form:
-/// Only examines closures and `std::convert::identity`
+/// * `|x| x`
-pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+/// * `|x| return x`
-    /// Checks if a function's body represents the identity function. Looks for bodies of the form:
+/// * `|x| { return x }`
-    /// * `|x| x`
+/// * `|x| { return x; }`
-    /// * `|x| return x`
+///
-    /// * `|x| { return x }`
+/// Consider calling [`is_expr_untyped_identity_function`] or [`is_expr_identity_function`] instead.
-    /// * `|x| { return x; }`
+fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
-    fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
+    let id = if_chain! {
-        let id = if_chain! {
+        if let [param] = func.params;
-            if let [param] = func.params;
+        if let PatKind::Binding(_, id, _, _) = param.pat.kind;
-            if let PatKind::Binding(_, id, _, _) = param.pat.kind;
+        then {
-            then {
+            id
-                id
+        } else {
-            } else {
+            return false;
-                return false;
+        }
-            }
+    };
-        };
 
-        let mut expr = func.value;
+    let mut expr = func.value;
-        loop {
+    loop {
-            match expr.kind {
+        match expr.kind {
-                #[rustfmt::skip]
+            ExprKind::Block(
-                ExprKind::Block(&Block { stmts: [], expr: Some(e), .. }, _, )
+                &Block {
-                | ExprKind::Ret(Some(e)) => expr = e,
+                    stmts: [],
-                #[rustfmt::skip]
+                    expr: Some(e),
-                ExprKind::Block(&Block { stmts: [stmt], expr: None, .. }, _) => {
+                    ..
-                    if_chain! {
-                        if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
-                        if let ExprKind::Ret(Some(ret_val)) = e.kind;
-                        then {
-                            expr = ret_val;
-                        } else {
-                            return false;
-                        }
-                    }
                 },
-                _ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
+                _,
-            }
+            )
+            | ExprKind::Ret(Some(e)) => expr = e,
+            ExprKind::Block(
+                &Block {
+                    stmts: [stmt],
+                    expr: None,
+                    ..
+                },
+                _,
+            ) => {
+                if_chain! {
+                    if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
+                    if let ExprKind::Ret(Some(ret_val)) = e.kind;
+                    then {
+                        expr = ret_val;
+                    } else {
+                        return false;
+                    }
+                }
+            },
+            _ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
         }
     }
+}
 
+/// This is the same as [`is_expr_identity_function`], but does not consider closures
+/// with type annotations for its bindings (or similar) as identity functions:
+/// * `|x: u8| x`
+/// * `std::convert::identity::<u8>`
+pub fn is_expr_untyped_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+    match expr.kind {
+        ExprKind::Closure(&Closure { body, fn_decl, .. })
+            if fn_decl.inputs.iter().all(|ty| matches!(ty.kind, TyKind::Infer)) =>
+        {
+            is_body_identity_function(cx, cx.tcx.hir().body(body))
+        },
+        ExprKind::Path(QPath::Resolved(_, path))
+            if path.segments.iter().all(|seg| seg.infer_args)
+                && let Some(did) = path.res.opt_def_id() => {
+            cx.tcx.is_diagnostic_item(sym::convert_identity, did)
+        },
+        _ => false,
+    }
+}
+
+/// Checks if an expression represents the identity function
+/// Only examines closures and `std::convert::identity`
+///
+/// NOTE: If you want to use this function to find out if a closure is unnecessary, you likely want
+/// to call [`is_expr_untyped_identity_function`] instead, which makes sure that the closure doesn't
+/// have type annotations. This is important because removing a closure with bindings can
+/// remove type information that helped type inference before, which can then lead to compile
+/// errors.
+pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
     match expr.kind {
         ExprKind::Closure(&Closure { body, .. }) => is_body_identity_function(cx, cx.tcx.hir().body(body)),
         _ => path_def_id(cx, expr).map_or(false, |id| cx.tcx.is_diagnostic_item(sym::convert_identity, id)),

clippy_utils/src/msrvs.rs

@@ -1,9 +1,7 @@
-use std::sync::OnceLock;
-
 use rustc_ast::Attribute;
 use rustc_semver::RustcVersion;
 use rustc_session::Session;
-use rustc_span::Span;
+use serde::Deserialize;
 
 use crate::attrs::get_unique_attr;
 
@@ -53,65 +51,45 @@ msrv_aliases! {
     1,15,0 { MAYBE_BOUND_IN_WHERE }
 }
 
-fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Option<RustcVersion> {
-    if let Ok(version) = RustcVersion::parse(msrv) {
-        return Some(version);
-    } else if let Some(sess) = sess {
-        if let Some(span) = span {
-            sess.span_err(span, format!("`{msrv}` is not a valid Rust version"));
-        }
-    }
-    None
-}
-
 /// Tracks the current MSRV from `clippy.toml`, `Cargo.toml` or set via `#[clippy::msrv]`
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone)]
 pub struct Msrv {
     stack: Vec<RustcVersion>,
 }
 
+impl<'de> Deserialize<'de> for Msrv {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let v = String::deserialize(deserializer)?;
+        RustcVersion::parse(&v)
+            .map(|v| Msrv { stack: vec![v] })
+            .map_err(|_| serde::de::Error::custom("not a valid Rust version"))
+    }
+}
+
 impl Msrv {
-    fn new(initial: Option<RustcVersion>) -> Self {
+    pub fn empty() -> Msrv {
-        Self {
+        Msrv { stack: Vec::new() }
-            stack: Vec::from_iter(initial),
-        }
     }
 
-    fn read_inner(conf_msrv: &Option<String>, sess: &Session) -> Self {
+    pub fn read_cargo(&mut self, sess: &Session) {
         let cargo_msrv = std::env::var("CARGO_PKG_RUST_VERSION")
             .ok()
-            .and_then(|v| parse_msrv(&v, None, None));
+            .and_then(|v| RustcVersion::parse(&v).ok());
-        let clippy_msrv = conf_msrv.as_ref().and_then(|s| {
-            parse_msrv(s, None, None).or_else(|| {
-                sess.err(format!(
-                    "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
-                ));
-                None
-            })
-        });
 
-        // if both files have an msrv, let's compare them and emit a warning if they differ
+        match (self.current(), cargo_msrv) {
-        if let Some(cargo_msrv) = cargo_msrv
+            (None, Some(cargo_msrv)) => self.stack = vec![cargo_msrv],
-            && let Some(clippy_msrv) = clippy_msrv
+            (Some(clippy_msrv), Some(cargo_msrv)) => {
-            && clippy_msrv != cargo_msrv
+                if clippy_msrv != cargo_msrv {
-        {
+                    sess.warn(format!(
-            sess.warn(format!(
+                        "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
-                "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
+                    ));
-            ));
+                }
+            },
+            _ => {},
         }
-
-        Self::new(clippy_msrv.or(cargo_msrv))
-    }
-
-    /// Set the initial MSRV from the Clippy config file or from Cargo due to the `rust-version`
-    /// field in `Cargo.toml`
-    ///
-    /// Returns a `&'static Msrv` as `Copy` types are more easily passed to the
-    /// `register_{late,early}_pass` callbacks
-    pub fn read(conf_msrv: &Option<String>, sess: &Session) -> &'static Self {
-        static PARSED: OnceLock<Msrv> = OnceLock::new();
-
-        PARSED.get_or_init(|| Self::read_inner(conf_msrv, sess))
     }
 
     pub fn current(&self) -> Option<RustcVersion> {
@@ -125,10 +103,14 @@ impl Msrv {
     fn parse_attr(sess: &Session, attrs: &[Attribute]) -> Option<RustcVersion> {
         if let Some(msrv_attr) = get_unique_attr(sess, attrs, "msrv") {
             if let Some(msrv) = msrv_attr.value_str() {
-                return parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
+                if let Ok(version) = RustcVersion::parse(msrv.as_str()) {
-            }
+                    return Some(version);
+                }
 
-            sess.span_err(msrv_attr.span, "bad clippy attribute");
+                sess.span_err(msrv_attr.span, format!("`{msrv}` is not a valid Rust version"));
+            } else {
+                sess.span_err(msrv_attr.span, "bad clippy attribute");
+            }
         }
 
         None

clippy_utils/src/paths.rs

@@ -98,7 +98,6 @@ pub const SYMBOL_TO_IDENT_STRING: [&str; 4] = ["rustc_span", "symbol", "Symbol",
 pub const SYM_MODULE: [&str; 3] = ["rustc_span", "symbol", "sym"];
 #[cfg(feature = "internal")]
 pub const SYNTAX_CONTEXT: [&str; 3] = ["rustc_span", "hygiene", "SyntaxContext"];
-pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"];
 #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
 pub const TOKIO_IO_ASYNCREADEXT: [&str; 5] = ["tokio", "io", "util", "async_read_ext", "AsyncReadExt"];
 #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates

clippy_utils/src/str_utils.rs

@@ -236,6 +236,59 @@ pub fn count_match_end(str1: &str, str2: &str) -> StrCount {
         })
 }
 
+/// Returns a `snake_case` version of the input
+/// ```
+/// use clippy_utils::str_utils::to_snake_case;
+/// assert_eq!(to_snake_case("AbcDef"), "abc_def");
+/// assert_eq!(to_snake_case("ABCD"), "a_b_c_d");
+/// assert_eq!(to_snake_case("AbcDD"), "abc_d_d");
+/// assert_eq!(to_snake_case("Abc1DD"), "abc1_d_d");
+/// ```
+pub fn to_snake_case(name: &str) -> String {
+    let mut s = String::new();
+    for (i, c) in name.chars().enumerate() {
+        if c.is_uppercase() {
+            // characters without capitalization are considered lowercase
+            if i != 0 {
+                s.push('_');
+            }
+            s.extend(c.to_lowercase());
+        } else {
+            s.push(c);
+        }
+    }
+    s
+}
+/// Returns a `CamelCase` version of the input
+/// ```
+/// use clippy_utils::str_utils::to_camel_case;
+/// assert_eq!(to_camel_case("abc_def"), "AbcDef");
+/// assert_eq!(to_camel_case("a_b_c_d"), "ABCD");
+/// assert_eq!(to_camel_case("abc_d_d"), "AbcDD");
+/// assert_eq!(to_camel_case("abc1_d_d"), "Abc1DD");
+/// ```
+pub fn to_camel_case(item_name: &str) -> String {
+    let mut s = String::new();
+    let mut up = true;
+    for c in item_name.chars() {
+        if c.is_uppercase() {
+            // we only turn snake case text into CamelCase
+            return item_name.to_string();
+        }
+        if c == '_' {
+            up = true;
+            continue;
+        }
+        if up {
+            up = false;
+            s.extend(c.to_uppercase());
+        } else {
+            s.push(c);
+        }
+    }
+    s
+}
+
 #[cfg(test)]
 mod test {
     use super::*;

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2023-10-06"
+channel = "nightly-2023-10-21"
 components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]

src/driver.rs

@@ -147,9 +147,9 @@ impl rustc_driver::Callbacks for ClippyCallbacks {
                 (previous)(sess, lint_store);
             }
 
-            let conf = clippy_lints::read_conf(sess, &conf_path);
+            let conf = clippy_lints::Conf::read(sess, &conf_path);
-            clippy_lints::register_plugins(lint_store, sess, &conf);
+            clippy_lints::register_plugins(lint_store, sess, conf);
-            clippy_lints::register_pre_expansion_lints(lint_store, sess, &conf);
+            clippy_lints::register_pre_expansion_lints(lint_store, conf);
             clippy_lints::register_renamed(lint_store);
         }));
 

tests/compile-test.rs

@@ -105,27 +105,20 @@ static EXTERN_FLAGS: LazyLock<Vec<String>> = LazyLock::new(|| {
 // whether to run internal tests or not
 const RUN_INTERNAL_TESTS: bool = cfg!(feature = "internal");
 
-fn canonicalize(path: impl AsRef<Path>) -> PathBuf {
-    let path = path.as_ref();
-    fs::create_dir_all(path).unwrap();
-    fs::canonicalize(path).unwrap_or_else(|err| panic!("{} cannot be canonicalized: {err}", path.display()))
-}
-
 fn base_config(test_dir: &str) -> (Config, Args) {
     let mut args = Args::test().unwrap();
     args.bless |= var_os("RUSTC_BLESS").is_some_and(|v| v != "0");
 
+    let target_dir = PathBuf::from(var_os("CARGO_TARGET_DIR").unwrap_or_else(|| "target".into()));
     let mut config = Config {
         mode: Mode::Yolo {
             rustfix: ui_test::RustfixMode::Everything,
         },
-        stderr_filters: vec![(Match::PathBackslash, b"/")],
-        stdout_filters: vec![],
         filter_files: env::var("TESTNAME")
             .map(|filters| filters.split(',').map(str::to_string).collect())
             .unwrap_or_default(),
         target: None,
-        out_dir: canonicalize(var_os("CARGO_TARGET_DIR").unwrap_or_else(|| "target".into())).join("ui_test"),
+        out_dir: target_dir.join("ui_test"),
         ..Config::rustc(Path::new("tests").join(test_dir))
     };
     config.with_args(&args, /* bless by default */ false);
@@ -168,19 +161,13 @@ fn run_ui() {
     config
         .program
         .envs
-        .push(("CLIPPY_CONF_DIR".into(), Some(canonicalize("tests").into())));
+        .push(("CLIPPY_CONF_DIR".into(), Some("tests".into())));
-
-    let quiet = args.quiet;
 
     ui_test::run_tests_generic(
         vec![config],
         ui_test::default_file_filter,
         ui_test::default_per_file_config,
-        if quiet {
+        status_emitter::Text::from(args.format),
-            status_emitter::Text::quiet()
-        } else {
-            status_emitter::Text::verbose()
-        },
     )
     .unwrap();
 }
@@ -194,17 +181,12 @@ fn run_internal_tests() {
     if let OutputConflictHandling::Error(err) = &mut config.output_conflict_handling {
         *err = "cargo uitest --features internal -- -- --bless".into();
     }
-    let quiet = args.quiet;
 
     ui_test::run_tests_generic(
         vec![config],
         ui_test::default_file_filter,
         ui_test::default_per_file_config,
-        if quiet {
+        status_emitter::Text::from(args.format),
-            status_emitter::Text::quiet()
-        } else {
-            status_emitter::Text::verbose()
-        },
     )
     .unwrap();
 }
@@ -212,22 +194,9 @@ fn run_internal_tests() {
 fn run_ui_toml() {
     let (mut config, args) = base_config("ui-toml");
 
-    config.stderr_filters = vec![
+    config
-        (
+        .stderr_filters
-            Match::Exact(
+        .push((Match::from(env::current_dir().unwrap().as_path()), b"$DIR"));
-                canonicalize("tests")
-                    .parent()
-                    .unwrap()
-                    .to_string_lossy()
-                    .as_bytes()
-                    .to_vec(),
-            ),
-            b"$DIR",
-        ),
-        (Match::Exact(b"\\".to_vec()), b"/"),
-    ];
-
-    let quiet = args.quiet;
 
     ui_test::run_tests_generic(
         vec![config],
@@ -238,11 +207,7 @@ fn run_ui_toml() {
                 .envs
                 .push(("CLIPPY_CONF_DIR".into(), Some(path.parent().unwrap().into())));
         },
-        if quiet {
+        status_emitter::Text::from(args.format),
-            status_emitter::Text::quiet()
-        } else {
-            status_emitter::Text::verbose()
-        },
     )
     .unwrap();
 }
@@ -270,22 +235,9 @@ fn run_ui_cargo() {
     });
     config.edition = None;
 
-    config.stderr_filters = vec![
+    config
-        (
+        .stderr_filters
-            Match::Exact(
+        .push((Match::from(env::current_dir().unwrap().as_path()), b"$DIR"));
-                canonicalize("tests")
-                    .parent()
-                    .unwrap()
-                    .to_string_lossy()
-                    .as_bytes()
-                    .to_vec(),
-            ),
-            b"$DIR",
-        ),
-        (Match::Exact(b"\\".to_vec()), b"/"),
-    ];
-
-    let quiet = args.quiet;
 
     let ignored_32bit = |path: &Path| {
         // FIXME: for some reason the modules are linted in a different order for this test
@@ -297,20 +249,8 @@ fn run_ui_cargo() {
         |path, config| {
             path.ends_with("Cargo.toml") && ui_test::default_any_file_filter(path, config) && !ignored_32bit(path)
         },
-        |config, path, _file_contents| {
+        |_config, _path, _file_contents| {},
-            config.out_dir = canonicalize(
+        status_emitter::Text::from(args.format),
-                std::env::current_dir()
-                    .unwrap()
-                    .join("target")
-                    .join("ui_test_cargo/")
-                    .join(path.parent().unwrap()),
-            );
-        },
-        if quiet {
-            status_emitter::Text::quiet()
-        } else {
-            status_emitter::Text::verbose()
-        },
     )
     .unwrap();
 }

tests/ui-internal/unnecessary_def_path_hardcoded_path.rs

@@ -12,5 +12,5 @@ fn main() {
     const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
 
     // Don't lint, not a diagnostic or language item
-    const OPS_MOD: [&str; 5] = ["core", "ops"];
+    const OPS_MOD: [&str; 2] = ["core", "ops"];
 }

tests/ui-toml/borrow_interior_mutable_const/clippy.toml

@@ -0,0 +1 @@
+ignore-interior-mutability = ["borrow_interior_mutable_const_ignore::Counted"]

tests/ui-toml/borrow_interior_mutable_const/ignore.rs

@@ -0,0 +1,37 @@
+//@compile-flags: --crate-name borrow_interior_mutable_const_ignore
+
+#![warn(clippy::borrow_interior_mutable_const)]
+#![allow(clippy::declare_interior_mutable_const)]
+
+use core::cell::Cell;
+use std::cmp::{Eq, PartialEq};
+use std::collections::{HashMap, HashSet};
+use std::hash::{Hash, Hasher};
+use std::ops::Deref;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+struct Counted<T> {
+    count: AtomicUsize,
+    val: T,
+}
+
+impl<T> Counted<T> {
+    const fn new(val: T) -> Self {
+        Self {
+            count: AtomicUsize::new(0),
+            val,
+        }
+    }
+}
+
+enum OptionalCell {
+    Unfrozen(Counted<bool>),
+    Frozen,
+}
+
+const UNFROZEN_VARIANT: OptionalCell = OptionalCell::Unfrozen(Counted::new(true));
+const FROZEN_VARIANT: OptionalCell = OptionalCell::Frozen;
+
+fn main() {
+    let _ = &UNFROZEN_VARIANT;
+}

tests/ui-toml/declare_interior_mutable_const/clippy.toml

@@ -0,0 +1 @@
+ignore-interior-mutability = ["declare_interior_mutable_const_ignore::Counted"]

tests/ui-toml/declare_interior_mutable_const/ignore.rs

@@ -0,0 +1,46 @@
+//@compile-flags: --crate-name declare_interior_mutable_const_ignore
+
+#![warn(clippy::declare_interior_mutable_const)]
+#![allow(clippy::borrow_interior_mutable_const)]
+
+use core::cell::Cell;
+use std::cmp::{Eq, PartialEq};
+use std::collections::{HashMap, HashSet};
+use std::hash::{Hash, Hasher};
+use std::ops::Deref;
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+struct Counted<T> {
+    count: AtomicUsize,
+    val: T,
+}
+
+impl<T> Counted<T> {
+    const fn new(val: T) -> Self {
+        Self {
+            count: AtomicUsize::new(0),
+            val,
+        }
+    }
+}
+
+enum OptionalCell {
+    Unfrozen(Counted<bool>),
+    Frozen,
+}
+
+const UNFROZEN_VARIANT: OptionalCell = OptionalCell::Unfrozen(Counted::new(true));
+const FROZEN_VARIANT: OptionalCell = OptionalCell::Frozen;
+
+const fn unfrozen_variant() -> OptionalCell {
+    OptionalCell::Unfrozen(Counted::new(true))
+}
+
+const fn frozen_variant() -> OptionalCell {
+    OptionalCell::Frozen
+}
+
+const UNFROZEN_VARIANT_FROM_FN: OptionalCell = unfrozen_variant();
+const FROZEN_VARIANT_FROM_FN: OptionalCell = frozen_variant();
+
+fn main() {}

tests/ui-toml/enum_variant_names/enum_variant_names.rs

@@ -1,16 +0,0 @@
-enum Foo {
-    AFoo,
-    BFoo,
-    CFoo,
-    DFoo,
-}
-enum Foo2 {
-    //~^ ERROR: all variants have the same postfix
-    AFoo,
-    BFoo,
-    CFoo,
-    DFoo,
-    EFoo,
-}
-
-fn main() {}

tests/ui-toml/enum_variant_names/enum_variant_names.stderr

@@ -1,18 +0,0 @@
-error: all variants have the same postfix: `Foo`
-  --> $DIR/enum_variant_names.rs:7:1
-   |
-LL | / enum Foo2 {
-LL | |
-LL | |     AFoo,
-LL | |     BFoo,
-...  |
-LL | |     EFoo,
-LL | | }
-   | |_^
-   |
-   = help: remove the postfixes and use full paths to the variants instead of glob imports
-   = note: `-D clippy::enum-variant-names` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::enum_variant_names)]`
-
-error: aborting due to previous error
-

tests/ui-toml/impl_trait_in_params/clippy.toml

@@ -0,0 +1 @@
+avoid-breaking-exported-api = false

tests/ui-toml/impl_trait_in_params/impl_trait_in_params.rs

@@ -0,0 +1,16 @@
+//! As avoid-breaking-exported-api is `false`, nothing here should lint
+#![warn(clippy::impl_trait_in_params)]
+#![no_main]
+//@no-rustfix
+
+pub trait Trait {}
+
+trait Private {
+    fn t(_: impl Trait);
+    fn tt<T: Trait>(_: T);
+}
+
+pub trait Public {
+    fn t(_: impl Trait); //~ ERROR: `impl Trait` used as a function parameter
+    fn tt<T: Trait>(_: T);
+}

tests/ui-toml/impl_trait_in_params/impl_trait_in_params.stderr

@@ -0,0 +1,15 @@
+error: `impl Trait` used as a function parameter
+  --> $DIR/impl_trait_in_params.rs:14:13
+   |
+LL |     fn t(_: impl Trait);
+   |             ^^^^^^^^^^
+   |
+   = note: `-D clippy::impl-trait-in-params` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::impl_trait_in_params)]`
+help: add a type parameter
+   |
+LL |     fn t<{ /* Generic name */ }: Trait>(_: impl Trait);
+   |         +++++++++++++++++++++++++++++++
+
+error: aborting due to previous error
+

tests/ui-toml/invalid_min_rust_version/invalid_min_rust_version.rs

@@ -1,4 +1,4 @@
-//@error-in-other-file: `invalid.version` is not a valid Rust version
+//@error-in-other-file: not a valid Rust version
 
 #![allow(clippy::redundant_clone)]
 

tests/ui-toml/invalid_min_rust_version/invalid_min_rust_version.stderr

@@ -1,4 +1,8 @@
-error: error reading Clippy's configuration file. `invalid.version` is not a valid Rust version
+error: error reading Clippy's configuration file: not a valid Rust version
+  --> $DIR/$DIR/clippy.toml:1:8
+   |
+LL | msrv = "invalid.version"
+   |        ^^^^^^^^^^^^^^^^^
 
 error: aborting due to previous error
 

tests/ui-toml/item_name_repetitions/threshold0/clippy.toml

@@ -1 +1,2 @@
+struct-field-name-threshold = 0
 enum-variant-name-threshold = 0

tests/ui-toml/item_name_repetitions/threshold0/item_name_repetitions.rs

@@ -1,3 +1,5 @@
+struct Data {}
+
 enum Actions {}
 
 fn main() {}

tests/ui-toml/item_name_repetitions/threshold5/clippy.toml

@@ -1 +1,2 @@
 enum-variant-name-threshold = 5
+struct-field-name-threshold = 5

tests/ui-toml/item_name_repetitions/threshold5/item_name_repetitions.rs

@@ -0,0 +1,32 @@
+#![warn(clippy::struct_field_names)]
+
+struct Data {
+    a_data: u8,
+    b_data: u8,
+    c_data: u8,
+    d_data: u8,
+}
+struct Data2 {
+    //~^ ERROR: all fields have the same postfix
+    a_data: u8,
+    b_data: u8,
+    c_data: u8,
+    d_data: u8,
+    e_data: u8,
+}
+enum Foo {
+    AFoo,
+    BFoo,
+    CFoo,
+    DFoo,
+}
+enum Foo2 {
+    //~^ ERROR: all variants have the same postfix
+    AFoo,
+    BFoo,
+    CFoo,
+    DFoo,
+    EFoo,
+}
+
+fn main() {}

tests/ui-toml/item_name_repetitions/threshold5/item_name_repetitions.stderr

@@ -0,0 +1,34 @@
+error: all fields have the same postfix: `data`
+  --> $DIR/item_name_repetitions.rs:9:1
+   |
+LL | / struct Data2 {
+LL | |
+LL | |     a_data: u8,
+LL | |     b_data: u8,
+...  |
+LL | |     e_data: u8,
+LL | | }
+   | |_^
+   |
+   = help: remove the postfixes
+   = note: `-D clippy::struct-field-names` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::struct_field_names)]`
+
+error: all variants have the same postfix: `Foo`
+  --> $DIR/item_name_repetitions.rs:23:1
+   |
+LL | / enum Foo2 {
+LL | |
+LL | |     AFoo,
+LL | |     BFoo,
+...  |
+LL | |     EFoo,
+LL | | }
+   | |_^
+   |
+   = help: remove the postfixes and use full paths to the variants instead of glob imports
+   = note: `-D clippy::enum-variant-names` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::enum_variant_names)]`
+
+error: aborting due to 2 previous errors
+

tests/ui-toml/pub_crate_missing_docs/pub_crate_missing_doc.rs

@@ -1,5 +1,6 @@
 //! this is crate
 #![allow(missing_docs)]
+#![allow(clippy::struct_field_names)]
 #![warn(clippy::missing_docs_in_private_items)]
 
 /// this is mod

tests/ui-toml/pub_crate_missing_docs/pub_crate_missing_doc.stderr

@@ -1,5 +1,5 @@
 error: missing documentation for a function
-  --> $DIR/pub_crate_missing_doc.rs:12:5
+  --> $DIR/pub_crate_missing_doc.rs:13:5
    |
 LL |     pub(crate) fn crate_no_docs() {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -8,25 +8,25 @@ LL |     pub(crate) fn crate_no_docs() {}
    = help: to override `-D warnings` add `#[allow(clippy::missing_docs_in_private_items)]`
 
 error: missing documentation for a function
-  --> $DIR/pub_crate_missing_doc.rs:15:5
+  --> $DIR/pub_crate_missing_doc.rs:16:5
    |
 LL |     pub(super) fn super_no_docs() {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: missing documentation for a function
-  --> $DIR/pub_crate_missing_doc.rs:23:9
+  --> $DIR/pub_crate_missing_doc.rs:24:9
    |
 LL |         pub(crate) fn sub_crate_no_docs() {}
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: missing documentation for a struct field
-  --> $DIR/pub_crate_missing_doc.rs:33:9
+  --> $DIR/pub_crate_missing_doc.rs:34:9
    |
 LL |         pub(crate) crate_field_no_docs: (),
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: missing documentation for a struct
-  --> $DIR/pub_crate_missing_doc.rs:39:5
+  --> $DIR/pub_crate_missing_doc.rs:40:5
    |
 LL | /     pub(crate) struct CrateStructNoDocs {
 LL | |         /// some docs
@@ -38,13 +38,13 @@ LL | |     }
    | |_____^
 
 error: missing documentation for a struct field
-  --> $DIR/pub_crate_missing_doc.rs:42:9
+  --> $DIR/pub_crate_missing_doc.rs:43:9
    |
 LL |         pub(crate) crate_field_no_docs: (),
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: missing documentation for a type alias
-  --> $DIR/pub_crate_missing_doc.rs:51:1
+  --> $DIR/pub_crate_missing_doc.rs:52:1
    |
 LL | type CrateTypedefNoDocs = String;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr

@@ -53,6 +53,7 @@ error: error reading Clippy's configuration file: unknown field `foobar`, expect
            single-char-binding-names-threshold
            stack-size-threshold
            standard-macro-braces
+           struct-field-name-threshold
            suppress-restriction-lint-in-const
            third-party
            too-large-for-stack
@@ -126,6 +127,7 @@ error: error reading Clippy's configuration file: unknown field `barfoo`, expect
            single-char-binding-names-threshold
            stack-size-threshold
            standard-macro-braces
+           struct-field-name-threshold
            suppress-restriction-lint-in-const
            third-party
            too-large-for-stack

tests/ui/author/macro_in_closure.rs

@@ -0,0 +1,5 @@
+fn main() {
+    #[clippy::author]
+    let print_text = |x| println!("{}", x);
+    print_text("hello");
+}

tests/ui/author/macro_in_closure.stdout

@@ -0,0 +1,39 @@
+if let StmtKind::Local(local) = stmt.kind
+    && let Some(init) = local.init
+    && let ExprKind::Closure(CaptureBy::Ref, fn_decl, body_id, _, None) = init.kind
+    && let FnRetTy::DefaultReturn(_) = fn_decl.output
+    && expr = &cx.tcx.hir().body(body_id).value
+    && let ExprKind::Block(block, None) = expr.kind
+    && block.stmts.len() == 1
+    && let StmtKind::Semi(e) = block.stmts[0].kind
+    && let ExprKind::Call(func, args) = e.kind
+    && let ExprKind::Path(ref qpath) = func.kind
+    && match_qpath(qpath, &["$crate", "io", "_print"])
+    && args.len() == 1
+    && let ExprKind::Call(func1, args1) = args[0].kind
+    && let ExprKind::Path(ref qpath1) = func1.kind
+    && args1.len() == 2
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner) = args1[0].kind
+    && let ExprKind::Array(elements) = inner.kind
+    && elements.len() == 2
+    && let ExprKind::Lit(ref lit) = elements[0].kind
+    && let LitKind::Str(s, _) = lit.node
+    && s.as_str() == ""
+    && let ExprKind::Lit(ref lit1) = elements[1].kind
+    && let LitKind::Str(s1, _) = lit1.node
+    && s1.as_str() == "\n"
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner1) = args1[1].kind
+    && let ExprKind::Array(elements1) = inner1.kind
+    && elements1.len() == 1
+    && let ExprKind::Call(func2, args2) = elements1[0].kind
+    && let ExprKind::Path(ref qpath2) = func2.kind
+    && args2.len() == 1
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner2) = args2[0].kind
+    && let ExprKind::Path(ref qpath3) = inner2.kind
+    && match_qpath(qpath3, &["x"])
+    && block.expr.is_none()
+    && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind
+    && name.as_str() == "print_text"
+{
+    // report your lint here
+}

tests/ui/author/macro_in_loop.rs

@@ -0,0 +1,8 @@
+#![feature(stmt_expr_attributes)]
+
+fn main() {
+    #[clippy::author]
+    for i in 0..1 {
+        println!("{}", i);
+    }
+}

tests/ui/author/macro_in_loop.stdout

@@ -0,0 +1,48 @@
+if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr)
+    && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = pat.kind
+    && name.as_str() == "i"
+    && let ExprKind::Struct(qpath, fields, None) = arg.kind
+    && matches!(qpath, QPath::LangItem(LangItem::Range, _))
+    && fields.len() == 2
+    && fields[0].ident.as_str() == "start"
+    && let ExprKind::Lit(ref lit) = fields[0].expr.kind
+    && let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node
+    && fields[1].ident.as_str() == "end"
+    && let ExprKind::Lit(ref lit1) = fields[1].expr.kind
+    && let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node
+    && let ExprKind::Block(block, None) = body.kind
+    && block.stmts.len() == 1
+    && let StmtKind::Semi(e) = block.stmts[0].kind
+    && let ExprKind::Block(block1, None) = e.kind
+    && block1.stmts.len() == 1
+    && let StmtKind::Semi(e1) = block1.stmts[0].kind
+    && let ExprKind::Call(func, args) = e1.kind
+    && let ExprKind::Path(ref qpath1) = func.kind
+    && match_qpath(qpath1, &["$crate", "io", "_print"])
+    && args.len() == 1
+    && let ExprKind::Call(func1, args1) = args[0].kind
+    && let ExprKind::Path(ref qpath2) = func1.kind
+    && args1.len() == 2
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner) = args1[0].kind
+    && let ExprKind::Array(elements) = inner.kind
+    && elements.len() == 2
+    && let ExprKind::Lit(ref lit2) = elements[0].kind
+    && let LitKind::Str(s, _) = lit2.node
+    && s.as_str() == ""
+    && let ExprKind::Lit(ref lit3) = elements[1].kind
+    && let LitKind::Str(s1, _) = lit3.node
+    && s1.as_str() == "\n"
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner1) = args1[1].kind
+    && let ExprKind::Array(elements1) = inner1.kind
+    && elements1.len() == 1
+    && let ExprKind::Call(func2, args2) = elements1[0].kind
+    && let ExprKind::Path(ref qpath3) = func2.kind
+    && args2.len() == 1
+    && let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner2) = args2[0].kind
+    && let ExprKind::Path(ref qpath4) = inner2.kind
+    && match_qpath(qpath4, &["i"])
+    && block1.expr.is_none()
+    && block.expr.is_none()
+{
+    // report your lint here
+}

tests/ui/get_first.fixed

@@ -14,17 +14,20 @@ impl Bar {
 
 fn main() {
     let x = vec![2, 3, 5];
-    let _ = x.first(); // Use x.first()
+    let _ = x.first();
+    //~^ ERROR: accessing first element with `x.get(0)`
     let _ = x.get(1);
     let _ = x[0];
 
     let y = [2, 3, 5];
-    let _ = y.first(); // Use y.first()
+    let _ = y.first();
+    //~^ ERROR: accessing first element with `y.get(0)`
     let _ = y.get(1);
     let _ = y[0];
 
     let z = &[2, 3, 5];
-    let _ = z.first(); // Use z.first()
+    let _ = z.first();
+    //~^ ERROR: accessing first element with `z.get(0)`
     let _ = z.get(1);
     let _ = z[0];
 
@@ -37,4 +40,8 @@ fn main() {
 
     let bar = Bar { arr: [0, 1, 2] };
     let _ = bar.get(0); // Do not lint, because Bar is struct.
+
+    let non_primitives = [vec![1, 2], vec![3, 4]];
+    let _ = non_primitives.first();
+    //~^ ERROR: accessing first element with `non_primitives.get(0)`
 }

tests/ui/get_first.rs

@@ -14,17 +14,20 @@ impl Bar {
 
 fn main() {
     let x = vec![2, 3, 5];
-    let _ = x.get(0); // Use x.first()
+    let _ = x.get(0);
+    //~^ ERROR: accessing first element with `x.get(0)`
     let _ = x.get(1);
     let _ = x[0];
 
     let y = [2, 3, 5];
-    let _ = y.get(0); // Use y.first()
+    let _ = y.get(0);
+    //~^ ERROR: accessing first element with `y.get(0)`
     let _ = y.get(1);
     let _ = y[0];
 
     let z = &[2, 3, 5];
-    let _ = z.get(0); // Use z.first()
+    let _ = z.get(0);
+    //~^ ERROR: accessing first element with `z.get(0)`
     let _ = z.get(1);
     let _ = z[0];
 
@@ -37,4 +40,8 @@ fn main() {
 
     let bar = Bar { arr: [0, 1, 2] };
     let _ = bar.get(0); // Do not lint, because Bar is struct.
+
+    let non_primitives = [vec![1, 2], vec![3, 4]];
+    let _ = non_primitives.get(0);
+    //~^ ERROR: accessing first element with `non_primitives.get(0)`
 }

tests/ui/get_first.stderr

@@ -1,23 +1,29 @@
 error: accessing first element with `x.get(0)`
   --> $DIR/get_first.rs:17:13
    |
-LL |     let _ = x.get(0); // Use x.first()
+LL |     let _ = x.get(0);
    |             ^^^^^^^^ help: try: `x.first()`
    |
    = note: `-D clippy::get-first` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::get_first)]`
 
 error: accessing first element with `y.get(0)`
-  --> $DIR/get_first.rs:22:13
+  --> $DIR/get_first.rs:23:13
    |
-LL |     let _ = y.get(0); // Use y.first()
+LL |     let _ = y.get(0);
    |             ^^^^^^^^ help: try: `y.first()`
 
 error: accessing first element with `z.get(0)`
-  --> $DIR/get_first.rs:27:13
+  --> $DIR/get_first.rs:29:13
    |
-LL |     let _ = z.get(0); // Use z.first()
+LL |     let _ = z.get(0);
    |             ^^^^^^^^ help: try: `z.first()`
 
-error: aborting due to 3 previous errors
+error: accessing first element with `non_primitives.get(0)`
+  --> $DIR/get_first.rs:45:13
+   |
+LL |     let _ = non_primitives.get(0);
+   |             ^^^^^^^^^^^^^^^^^^^^^ help: try: `non_primitives.first()`
+
+error: aborting due to 4 previous errors
 

tests/ui/impl_trait_in_params.rs

@@ -1,20 +1,47 @@
 #![allow(unused)]
 #![warn(clippy::impl_trait_in_params)]
+
 //@no-rustfix
 pub trait Trait {}
 pub trait AnotherTrait<T> {}
 
 // Should warn
 pub fn a(_: impl Trait) {}
-//~^ ERROR: '`impl Trait` used as a function parameter'
+//~^ ERROR: `impl Trait` used as a function parameter
-//~| NOTE: `-D clippy::impl-trait-in-params` implied by `-D warnings`
 pub fn c<C: Trait>(_: C, _: impl Trait) {}
-//~^ ERROR: '`impl Trait` used as a function parameter'
+//~^ ERROR: `impl Trait` used as a function parameter
-fn d(_: impl AnotherTrait<u32>) {}
 
 // Shouldn't warn
 
 pub fn b<B: Trait>(_: B) {}
 fn e<T: AnotherTrait<u32>>(_: T) {}
+fn d(_: impl AnotherTrait<u32>) {}
+
+//------ IMPLS
+
+pub trait Public {
+    // See test in ui-toml for a case where avoid-breaking-exported-api is set to false
+    fn t(_: impl Trait);
+    fn tt<T: Trait>(_: T) {}
+}
+
+trait Private {
+    // This shouldn't lint
+    fn t(_: impl Trait);
+    fn tt<T: Trait>(_: T) {}
+}
+
+struct S;
+impl S {
+    pub fn h(_: impl Trait) {} //~ ERROR: `impl Trait` used as a function parameter
+    fn i(_: impl Trait) {}
+    pub fn j<J: Trait>(_: J) {}
+    pub fn k<K: AnotherTrait<u32>>(_: K, _: impl AnotherTrait<u32>) {} //~ ERROR: `impl Trait` used as a function parameter
+}
+
+// Trying with traits
+impl Public for S {
+    fn t(_: impl Trait) {}
+}
 
 fn main() {}

tests/ui/impl_trait_in_params.stderr

@@ -1,5 +1,5 @@
-error: '`impl Trait` used as a function parameter'
+error: `impl Trait` used as a function parameter
-  --> $DIR/impl_trait_in_params.rs:8:13
+  --> $DIR/impl_trait_in_params.rs:9:13
    |
 LL | pub fn a(_: impl Trait) {}
    |             ^^^^^^^^^^
@@ -11,7 +11,7 @@ help: add a type parameter
 LL | pub fn a<{ /* Generic name */ }: Trait>(_: impl Trait) {}
    |         +++++++++++++++++++++++++++++++
 
-error: '`impl Trait` used as a function parameter'
+error: `impl Trait` used as a function parameter
   --> $DIR/impl_trait_in_params.rs:11:29
    |
 LL | pub fn c<C: Trait>(_: C, _: impl Trait) {}
@@ -22,5 +22,27 @@ help: add a type parameter
 LL | pub fn c<C: Trait, { /* Generic name */ }: Trait>(_: C, _: impl Trait) {}
    |                  +++++++++++++++++++++++++++++++
 
-error: aborting due to 2 previous errors
+error: `impl Trait` used as a function parameter
+  --> $DIR/impl_trait_in_params.rs:36:17
+   |
+LL |     pub fn h(_: impl Trait) {}
+   |                 ^^^^^^^^^^
+   |
+help: add a type parameter
+   |
+LL |     pub fn h<{ /* Generic name */ }: Trait>(_: impl Trait) {}
+   |             +++++++++++++++++++++++++++++++
+
+error: `impl Trait` used as a function parameter
+  --> $DIR/impl_trait_in_params.rs:39:45
+   |
+LL |     pub fn k<K: AnotherTrait<u32>>(_: K, _: impl AnotherTrait<u32>) {}
+   |                                             ^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: add a type parameter
+   |
+LL |     pub fn k<K: AnotherTrait<u32>, { /* Generic name */ }: AnotherTrait<u32>>(_: K, _: impl AnotherTrait<u32>) {}
+   |                                  +++++++++++++++++++++++++++++++++++++++++++
+
+error: aborting due to 4 previous errors
 

tests/ui/into_iter_without_iter.rs

@@ -122,3 +122,37 @@ fn main() {
         }
     }
 }
+
+fn issue11635() {
+    // A little more involved than the original repro in the issue, but this tests that it correctly
+    // works for more than one deref step
+
+    use std::ops::Deref;
+
+    pub struct Thing(Vec<u8>);
+    pub struct Thing2(Thing);
+
+    impl Deref for Thing {
+        type Target = [u8];
+
+        fn deref(&self) -> &Self::Target {
+            &self.0
+        }
+    }
+
+    impl Deref for Thing2 {
+        type Target = Thing;
+        fn deref(&self) -> &Self::Target {
+            &self.0
+        }
+    }
+
+    impl<'a> IntoIterator for &'a Thing2 {
+        type Item = &'a u8;
+        type IntoIter = <&'a [u8] as IntoIterator>::IntoIter;
+
+        fn into_iter(self) -> Self::IntoIter {
+            self.0.iter()
+        }
+    }
+}

tests/ui/manual_filter_map.fixed

@@ -2,6 +2,7 @@
 #![warn(clippy::manual_filter_map)]
 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
 #![allow(clippy::useless_vec)]
+#![allow(clippy::struct_field_names)]
 
 fn main() {
     // is_some(), unwrap()

tests/ui/manual_filter_map.rs

@@ -2,6 +2,7 @@
 #![warn(clippy::manual_filter_map)]
 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
 #![allow(clippy::useless_vec)]
+#![allow(clippy::struct_field_names)]
 
 fn main() {
     // is_some(), unwrap()

tests/ui/manual_filter_map.stderr

@@ -1,11 +1,11 @@
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:8:19
+  --> $DIR/manual_filter_map.rs:9:19
    |
 LL |     let _ = (0..).filter(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap());
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `filter_map(|a| to_opt(a))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:8:30
+  --> $DIR/manual_filter_map.rs:9:30
    |
 LL |     let _ = (0..).filter(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap());
    |                              ^^^^^^^^^^
@@ -13,31 +13,31 @@ LL |     let _ = (0..).filter(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap
    = help: to override `-D warnings` add `#[allow(clippy::manual_filter_map)]`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:11:19
+  --> $DIR/manual_filter_map.rs:12:19
    |
 LL |     let _ = (0..).filter(|&n| to_opt(n).is_some()).map(|a| to_opt(a).expect("hi"));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `filter_map(|a| to_opt(a))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:11:31
+  --> $DIR/manual_filter_map.rs:12:31
    |
 LL |     let _ = (0..).filter(|&n| to_opt(n).is_some()).map(|a| to_opt(a).expect("hi"));
    |                               ^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:14:19
+  --> $DIR/manual_filter_map.rs:15:19
    |
 LL |     let _ = (0..).filter(|&n| to_res(n).is_ok()).map(|a| to_res(a).unwrap_or(1));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `filter_map(|a| to_res(a).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:14:31
+  --> $DIR/manual_filter_map.rs:15:31
    |
 LL |     let _ = (0..).filter(|&n| to_res(n).is_ok()).map(|a| to_res(a).unwrap_or(1));
    |                               ^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:17:10
+  --> $DIR/manual_filter_map.rs:18:10
    |
 LL |           .filter(|&x| to_ref(to_opt(x)).is_some())
    |  __________^
@@ -45,13 +45,13 @@ LL | |         .map(|y| to_ref(to_opt(y)).unwrap());
    | |____________________________________________^ help: try: `filter_map(|y| *to_ref(to_opt(y)))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:17:22
+  --> $DIR/manual_filter_map.rs:18:22
    |
 LL |         .filter(|&x| to_ref(to_opt(x)).is_some())
    |                      ^^^^^^^^^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:20:10
+  --> $DIR/manual_filter_map.rs:21:10
    |
 LL |           .filter(|x| to_ref(to_opt(*x)).is_some())
    |  __________^
@@ -59,13 +59,13 @@ LL | |         .map(|y| to_ref(to_opt(y)).unwrap());
    | |____________________________________________^ help: try: `filter_map(|y| *to_ref(to_opt(y)))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:20:21
+  --> $DIR/manual_filter_map.rs:21:21
    |
 LL |         .filter(|x| to_ref(to_opt(*x)).is_some())
    |                     ^^^^^^^^^^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:24:10
+  --> $DIR/manual_filter_map.rs:25:10
    |
 LL |           .filter(|&x| to_ref(to_res(x)).is_ok())
    |  __________^
@@ -73,13 +73,13 @@ LL | |         .map(|y| to_ref(to_res(y)).unwrap());
    | |____________________________________________^ help: try: `filter_map(|y| to_ref(to_res(y)).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:24:22
+  --> $DIR/manual_filter_map.rs:25:22
    |
 LL |         .filter(|&x| to_ref(to_res(x)).is_ok())
    |                      ^^^^^^^^^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:27:10
+  --> $DIR/manual_filter_map.rs:28:10
    |
 LL |           .filter(|x| to_ref(to_res(*x)).is_ok())
    |  __________^
@@ -87,13 +87,13 @@ LL | |         .map(|y| to_ref(to_res(y)).unwrap());
    | |____________________________________________^ help: try: `filter_map(|y| to_ref(to_res(y)).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:27:21
+  --> $DIR/manual_filter_map.rs:28:21
    |
 LL |         .filter(|x| to_ref(to_res(*x)).is_ok())
    |                     ^^^^^^^^^^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:33:27
+  --> $DIR/manual_filter_map.rs:34:27
    |
 LL |     iter::<Option<&u8>>().find(|x| x.is_some()).map(|x| x.cloned().unwrap());
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned())`
@@ -102,79 +102,79 @@ LL |     iter::<Option<&u8>>().find(|x| x.is_some()).map(|x| x.cloned().unwrap()
    = help: to override `-D warnings` add `#[allow(clippy::manual_find_map)]`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:34:28
+  --> $DIR/manual_filter_map.rs:35:28
    |
 LL |     iter::<&Option<&u8>>().find(|x| x.is_some()).map(|x| x.cloned().unwrap());
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:35:31
+  --> $DIR/manual_filter_map.rs:36:31
    |
 LL |     iter::<&Option<String>>().find(|x| x.is_some()).map(|x| x.as_deref().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.as_deref())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:36:31
+  --> $DIR/manual_filter_map.rs:37:31
    |
 LL |     iter::<Option<&String>>().find(|&x| to_ref(x).is_some()).map(|y| to_ref(y).cloned().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|y| to_ref(y).cloned())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:36:41
+  --> $DIR/manual_filter_map.rs:37:41
    |
 LL |     iter::<Option<&String>>().find(|&x| to_ref(x).is_some()).map(|y| to_ref(y).cloned().unwrap());
    |                                         ^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:38:30
+  --> $DIR/manual_filter_map.rs:39:30
    |
 LL |     iter::<Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:39:31
+  --> $DIR/manual_filter_map.rs:40:31
    |
 LL |     iter::<&Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:40:32
+  --> $DIR/manual_filter_map.rs:41:32
    |
 LL |     iter::<&&Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:41:31
+  --> $DIR/manual_filter_map.rs:42:31
    |
 LL |     iter::<Result<&u8, ()>>().find(|x| x.is_ok()).map(|x| x.cloned().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:42:32
+  --> $DIR/manual_filter_map.rs:43:32
    |
 LL |     iter::<&Result<&u8, ()>>().find(|x| x.is_ok()).map(|x| x.cloned().unwrap());
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:43:35
+  --> $DIR/manual_filter_map.rs:44:35
    |
 LL |     iter::<&Result<String, ()>>().find(|x| x.is_ok()).map(|x| x.as_deref().unwrap());
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.as_deref().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_filter_map.rs:44:35
+  --> $DIR/manual_filter_map.rs:45:35
    |
 LL |     iter::<Result<&String, ()>>().find(|&x| to_ref(x).is_ok()).map(|y| to_ref(y).cloned().unwrap());
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|y| to_ref(y).cloned().ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_filter_map.rs:44:45
+  --> $DIR/manual_filter_map.rs:45:45
    |
 LL |     iter::<Result<&String, ()>>().find(|&x| to_ref(x).is_ok()).map(|y| to_ref(y).cloned().unwrap());
    |                                             ^^^^^^^^^
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:92:10
+  --> $DIR/manual_filter_map.rs:93:10
    |
 LL |           .filter(|f| f.option_field.is_some())
    |  __________^
@@ -182,7 +182,7 @@ LL | |         .map(|f| f.option_field.clone().unwrap());
    | |_________________________________________________^ help: try: `filter_map(|f| f.option_field.clone())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:97:10
+  --> $DIR/manual_filter_map.rs:98:10
    |
 LL |           .filter(|f| f.ref_field.is_some())
    |  __________^
@@ -190,7 +190,7 @@ LL | |         .map(|f| f.ref_field.cloned().unwrap());
    | |_______________________________________________^ help: try: `filter_map(|f| f.ref_field.cloned())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:102:10
+  --> $DIR/manual_filter_map.rs:103:10
    |
 LL |           .filter(|f| f.ref_field.is_some())
    |  __________^
@@ -198,7 +198,7 @@ LL | |         .map(|f| f.ref_field.copied().unwrap());
    | |_______________________________________________^ help: try: `filter_map(|f| f.ref_field.copied())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:107:10
+  --> $DIR/manual_filter_map.rs:108:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -206,7 +206,7 @@ LL | |         .map(|f| f.result_field.clone().unwrap());
    | |_________________________________________________^ help: try: `filter_map(|f| f.result_field.clone().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:112:10
+  --> $DIR/manual_filter_map.rs:113:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -214,7 +214,7 @@ LL | |         .map(|f| f.result_field.as_ref().unwrap());
    | |__________________________________________________^ help: try: `filter_map(|f| f.result_field.as_ref().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:117:10
+  --> $DIR/manual_filter_map.rs:118:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -222,7 +222,7 @@ LL | |         .map(|f| f.result_field.as_deref().unwrap());
    | |____________________________________________________^ help: try: `filter_map(|f| f.result_field.as_deref().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:122:10
+  --> $DIR/manual_filter_map.rs:123:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -230,7 +230,7 @@ LL | |         .map(|f| f.result_field.as_mut().unwrap());
    | |__________________________________________________^ help: try: `filter_map(|f| f.result_field.as_mut().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:127:10
+  --> $DIR/manual_filter_map.rs:128:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -238,7 +238,7 @@ LL | |         .map(|f| f.result_field.as_deref_mut().unwrap());
    | |________________________________________________________^ help: try: `filter_map(|f| f.result_field.as_deref_mut().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:132:10
+  --> $DIR/manual_filter_map.rs:133:10
    |
 LL |           .filter(|f| f.result_field.is_ok())
    |  __________^
@@ -246,7 +246,7 @@ LL | |         .map(|f| f.result_field.to_owned().unwrap());
    | |____________________________________________________^ help: try: `filter_map(|f| f.result_field.to_owned().ok())`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:145:27
+  --> $DIR/manual_filter_map.rs:146:27
    |
 LL |       let _x = iter.clone().filter(|x| matches!(x, Enum::A(_))).map(|x| match x {
    |  ___________________________^
@@ -256,7 +256,7 @@ LL | |     });
    | |______^ help: try: `filter_map(|x| match x { Enum::A(s) => Some(s), _ => None })`
 
 error: `filter(..).map(..)` can be simplified as `filter_map(..)`
-  --> $DIR/manual_filter_map.rs:155:10
+  --> $DIR/manual_filter_map.rs:156:10
    |
 LL |           .filter(|x| matches!(x, Enum::A(_)))
    |  __________^

tests/ui/manual_find_map.fixed

@@ -2,6 +2,7 @@
 #![warn(clippy::manual_find_map)]
 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
 #![allow(clippy::useless_vec)]
+#![allow(clippy::struct_field_names)]
 
 fn main() {
     // is_some(), unwrap()

tests/ui/manual_find_map.rs

@@ -2,6 +2,7 @@
 #![warn(clippy::manual_find_map)]
 #![allow(clippy::redundant_closure)] // FIXME suggestion may have redundant closure
 #![allow(clippy::useless_vec)]
+#![allow(clippy::struct_field_names)]
 
 fn main() {
     // is_some(), unwrap()

tests/ui/manual_find_map.stderr

@@ -1,11 +1,11 @@
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:8:19
+  --> $DIR/manual_find_map.rs:9:19
    |
 LL |     let _ = (0..).find(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap());
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|a| to_opt(a))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:8:28
+  --> $DIR/manual_find_map.rs:9:28
    |
 LL |     let _ = (0..).find(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap());
    |                            ^^^^^^^^^^
@@ -13,31 +13,31 @@ LL |     let _ = (0..).find(|n| to_opt(*n).is_some()).map(|a| to_opt(a).unwrap()
    = help: to override `-D warnings` add `#[allow(clippy::manual_find_map)]`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:11:19
+  --> $DIR/manual_find_map.rs:12:19
    |
 LL |     let _ = (0..).find(|&n| to_opt(n).is_some()).map(|a| to_opt(a).expect("hi"));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|a| to_opt(a))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:11:29
+  --> $DIR/manual_find_map.rs:12:29
    |
 LL |     let _ = (0..).find(|&n| to_opt(n).is_some()).map(|a| to_opt(a).expect("hi"));
    |                             ^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:14:19
+  --> $DIR/manual_find_map.rs:15:19
    |
 LL |     let _ = (0..).find(|&n| to_res(n).is_ok()).map(|a| to_res(a).unwrap_or(1));
    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|a| to_res(a).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:14:29
+  --> $DIR/manual_find_map.rs:15:29
    |
 LL |     let _ = (0..).find(|&n| to_res(n).is_ok()).map(|a| to_res(a).unwrap_or(1));
    |                             ^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:17:10
+  --> $DIR/manual_find_map.rs:18:10
    |
 LL |           .find(|&x| to_ref(to_opt(x)).is_some())
    |  __________^
@@ -45,13 +45,13 @@ LL | |         .map(|y| to_ref(to_opt(y)).unwrap());
    | |____________________________________________^ help: try: `find_map(|y| *to_ref(to_opt(y)))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:17:20
+  --> $DIR/manual_find_map.rs:18:20
    |
 LL |         .find(|&x| to_ref(to_opt(x)).is_some())
    |                    ^^^^^^^^^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:20:10
+  --> $DIR/manual_find_map.rs:21:10
    |
 LL |           .find(|x| to_ref(to_opt(*x)).is_some())
    |  __________^
@@ -59,13 +59,13 @@ LL | |         .map(|y| to_ref(to_opt(y)).unwrap());
    | |____________________________________________^ help: try: `find_map(|y| *to_ref(to_opt(y)))`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:20:19
+  --> $DIR/manual_find_map.rs:21:19
    |
 LL |         .find(|x| to_ref(to_opt(*x)).is_some())
    |                   ^^^^^^^^^^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:24:10
+  --> $DIR/manual_find_map.rs:25:10
    |
 LL |           .find(|&x| to_ref(to_res(x)).is_ok())
    |  __________^
@@ -73,13 +73,13 @@ LL | |         .map(|y| to_ref(to_res(y)).unwrap());
    | |____________________________________________^ help: try: `find_map(|y| to_ref(to_res(y)).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:24:20
+  --> $DIR/manual_find_map.rs:25:20
    |
 LL |         .find(|&x| to_ref(to_res(x)).is_ok())
    |                    ^^^^^^^^^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:27:10
+  --> $DIR/manual_find_map.rs:28:10
    |
 LL |           .find(|x| to_ref(to_res(*x)).is_ok())
    |  __________^
@@ -87,109 +87,109 @@ LL | |         .map(|y| to_ref(to_res(y)).unwrap());
    | |____________________________________________^ help: try: `find_map(|y| to_ref(to_res(y)).ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:27:19
+  --> $DIR/manual_find_map.rs:28:19
    |
 LL |         .find(|x| to_ref(to_res(*x)).is_ok())
    |                   ^^^^^^^^^^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:33:26
+  --> $DIR/manual_find_map.rs:34:26
    |
 LL |     iter::<Option<u8>>().find(|x| x.is_some()).map(|x| x.unwrap());
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x)`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:34:27
+  --> $DIR/manual_find_map.rs:35:27
    |
 LL |     iter::<&Option<u8>>().find(|x| x.is_some()).map(|x| x.unwrap());
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| *x)`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:35:28
+  --> $DIR/manual_find_map.rs:36:28
    |
 LL |     iter::<&&Option<u8>>().find(|x| x.is_some()).map(|x| x.unwrap());
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| **x)`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:36:27
+  --> $DIR/manual_find_map.rs:37:27
    |
 LL |     iter::<Option<&u8>>().find(|x| x.is_some()).map(|x| x.cloned().unwrap());
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:37:28
+  --> $DIR/manual_find_map.rs:38:28
    |
 LL |     iter::<&Option<&u8>>().find(|x| x.is_some()).map(|x| x.cloned().unwrap());
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:38:31
+  --> $DIR/manual_find_map.rs:39:31
    |
 LL |     iter::<&Option<String>>().find(|x| x.is_some()).map(|x| x.as_deref().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.as_deref())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:39:31
+  --> $DIR/manual_find_map.rs:40:31
    |
 LL |     iter::<Option<&String>>().find(|&x| to_ref(x).is_some()).map(|y| to_ref(y).cloned().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|y| to_ref(y).cloned())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:39:41
+  --> $DIR/manual_find_map.rs:40:41
    |
 LL |     iter::<Option<&String>>().find(|&x| to_ref(x).is_some()).map(|y| to_ref(y).cloned().unwrap());
    |                                         ^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:41:30
+  --> $DIR/manual_find_map.rs:42:30
    |
 LL |     iter::<Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:42:31
+  --> $DIR/manual_find_map.rs:43:31
    |
 LL |     iter::<&Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:43:32
+  --> $DIR/manual_find_map.rs:44:32
    |
 LL |     iter::<&&Result<u8, ()>>().find(|x| x.is_ok()).map(|x| x.unwrap());
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:44:31
+  --> $DIR/manual_find_map.rs:45:31
    |
 LL |     iter::<Result<&u8, ()>>().find(|x| x.is_ok()).map(|x| x.cloned().unwrap());
    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:45:32
+  --> $DIR/manual_find_map.rs:46:32
    |
 LL |     iter::<&Result<&u8, ()>>().find(|x| x.is_ok()).map(|x| x.cloned().unwrap());
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.cloned().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:46:35
+  --> $DIR/manual_find_map.rs:47:35
    |
 LL |     iter::<&Result<String, ()>>().find(|x| x.is_ok()).map(|x| x.as_deref().unwrap());
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|x| x.as_deref().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:47:35
+  --> $DIR/manual_find_map.rs:48:35
    |
 LL |     iter::<Result<&String, ()>>().find(|&x| to_ref(x).is_ok()).map(|y| to_ref(y).cloned().unwrap());
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `find_map(|y| to_ref(y).cloned().ok())`
    |
 note: the suggestion might change the behavior of the program when merging `filter` and `map`, because this expression potentially contains side effects and will only execute once
-  --> $DIR/manual_find_map.rs:47:45
+  --> $DIR/manual_find_map.rs:48:45
    |
 LL |     iter::<Result<&String, ()>>().find(|&x| to_ref(x).is_ok()).map(|y| to_ref(y).cloned().unwrap());
    |                                             ^^^^^^^^^
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:95:10
+  --> $DIR/manual_find_map.rs:96:10
    |
 LL |           .find(|f| f.option_field.is_some())
    |  __________^
@@ -197,7 +197,7 @@ LL | |         .map(|f| f.option_field.clone().unwrap());
    | |_________________________________________________^ help: try: `find_map(|f| f.option_field.clone())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:100:10
+  --> $DIR/manual_find_map.rs:101:10
    |
 LL |           .find(|f| f.ref_field.is_some())
    |  __________^
@@ -205,7 +205,7 @@ LL | |         .map(|f| f.ref_field.cloned().unwrap());
    | |_______________________________________________^ help: try: `find_map(|f| f.ref_field.cloned())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:105:10
+  --> $DIR/manual_find_map.rs:106:10
    |
 LL |           .find(|f| f.ref_field.is_some())
    |  __________^
@@ -213,7 +213,7 @@ LL | |         .map(|f| f.ref_field.copied().unwrap());
    | |_______________________________________________^ help: try: `find_map(|f| f.ref_field.copied())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:110:10
+  --> $DIR/manual_find_map.rs:111:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^
@@ -221,7 +221,7 @@ LL | |         .map(|f| f.result_field.clone().unwrap());
    | |_________________________________________________^ help: try: `find_map(|f| f.result_field.clone().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:115:10
+  --> $DIR/manual_find_map.rs:116:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^
@@ -229,7 +229,7 @@ LL | |         .map(|f| f.result_field.as_ref().unwrap());
    | |__________________________________________________^ help: try: `find_map(|f| f.result_field.as_ref().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:120:10
+  --> $DIR/manual_find_map.rs:121:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^
@@ -237,7 +237,7 @@ LL | |         .map(|f| f.result_field.as_deref().unwrap());
    | |____________________________________________________^ help: try: `find_map(|f| f.result_field.as_deref().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:125:10
+  --> $DIR/manual_find_map.rs:126:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^
@@ -245,7 +245,7 @@ LL | |         .map(|f| f.result_field.as_mut().unwrap());
    | |__________________________________________________^ help: try: `find_map(|f| f.result_field.as_mut().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:130:10
+  --> $DIR/manual_find_map.rs:131:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^
@@ -253,7 +253,7 @@ LL | |         .map(|f| f.result_field.as_deref_mut().unwrap());
    | |________________________________________________________^ help: try: `find_map(|f| f.result_field.as_deref_mut().ok())`
 
 error: `find(..).map(..)` can be simplified as `find_map(..)`
-  --> $DIR/manual_find_map.rs:135:10
+  --> $DIR/manual_find_map.rs:136:10
    |
 LL |           .find(|f| f.result_field.is_ok())
    |  __________^

tests/ui/manual_is_ascii_check.fixed

@@ -33,6 +33,7 @@ fn msrv_1_23() {
     assert!(matches!(b'1', b'0'..=b'9'));
     assert!(matches!('X', 'A'..='Z'));
     assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+    assert!(matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F'));
 }
 
 #[clippy::msrv = "1.24"]
@@ -40,14 +41,17 @@ fn msrv_1_24() {
     assert!(b'1'.is_ascii_digit());
     assert!('X'.is_ascii_uppercase());
     assert!('x'.is_ascii_alphabetic());
+    assert!('x'.is_ascii_hexdigit());
 }
 
 #[clippy::msrv = "1.46"]
 fn msrv_1_46() {
     const FOO: bool = matches!('x', '0'..='9');
+    const BAR: bool = matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F');
 }
 
 #[clippy::msrv = "1.47"]
 fn msrv_1_47() {
     const FOO: bool = 'x'.is_ascii_digit();
+    const BAR: bool = 'x'.is_ascii_hexdigit();
 }

tests/ui/manual_is_ascii_check.rs

@@ -33,6 +33,7 @@ fn msrv_1_23() {
     assert!(matches!(b'1', b'0'..=b'9'));
     assert!(matches!('X', 'A'..='Z'));
     assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+    assert!(matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F'));
 }
 
 #[clippy::msrv = "1.24"]
@@ -40,14 +41,17 @@ fn msrv_1_24() {
     assert!(matches!(b'1', b'0'..=b'9'));
     assert!(matches!('X', 'A'..='Z'));
     assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+    assert!(matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F'));
 }
 
 #[clippy::msrv = "1.46"]
 fn msrv_1_46() {
     const FOO: bool = matches!('x', '0'..='9');
+    const BAR: bool = matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F');
 }
 
 #[clippy::msrv = "1.47"]
 fn msrv_1_47() {
     const FOO: bool = matches!('x', '0'..='9');
+    const BAR: bool = matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F');
 }