Auto merge of #13278 - Alexendoo:misc-cleanup, r=y21

Misc cleanup

changelog: none

clippy_lints/src/attrs/mod.rs

@@ -1,5 +1,3 @@
-//! checks for attributes
-
 mod allow_attributes;
 mod allow_attributes_without_reason;
 mod blanket_clippy_restriction_lints;

clippy_lints/src/cargo/common_metadata.rs

@@ -1,5 +1,3 @@
-//! lint on missing cargo common metadata
-
 use cargo_metadata::Metadata;
 use clippy_utils::diagnostics::span_lint;
 use rustc_lint::LateContext;

clippy_lints/src/cargo/multiple_crate_versions.rs

@@ -1,5 +1,3 @@
-//! lint on multiple versions of a crate being used
-
 use cargo_metadata::{DependencyKind, Metadata, Node, Package, PackageId};
 use clippy_utils::diagnostics::span_lint;
 use itertools::Itertools;

clippy_lints/src/casts/cast_possible_truncation.rs

@@ -4,7 +4,7 @@
 use clippy_utils::source::snippet;
 use clippy_utils::sugg::Sugg;
 use clippy_utils::ty::{get_discriminant_value, is_isize_or_usize};
-use rustc_errors::{Applicability, Diag, SuggestionStyle};
+use rustc_errors::{Applicability, Diag};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::LateContext;
@@ -190,12 +190,10 @@ fn offer_suggestion(
         format!("{cast_to_snip}::try_from({})", Sugg::hir(cx, cast_expr, ".."))
     };
 
-    diag.span_suggestion_with_style(
+    diag.span_suggestion_verbose(
         expr.span,
         "... or use `try_from` and handle the error accordingly",
         suggestion,
         Applicability::Unspecified,
-        // always show the suggestion in a separate line
-        SuggestionStyle::ShowAlways,
     );
 }

clippy_lints/src/casts/fn_to_numeric_cast_any.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet_with_applicability;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_hir::Expr;
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, Ty};
@@ -24,12 +24,11 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>,
             expr.span,
             format!("casting function pointer `{from_snippet}` to `{cast_to}`"),
             |diag| {
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(
                     expr.span,
                     "did you mean to invoke the function?",
                     format!("{from_snippet}() as {cast_to}"),
                     applicability,
-                    SuggestionStyle::ShowAlways,
                 );
             },
         );

clippy_lints/src/checked_conversions.rs

@@ -1,5 +1,3 @@
-//! lint on manually implemented checked conversions that could be transformed into `try_from`
-
 use clippy_config::msrvs::{self, Msrv};
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_sugg;

clippy_lints/src/cognitive_complexity.rs

@@ -1,5 +1,3 @@
-//! calculate cognitive complexity and warn about overly complex functions
-
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::source::{IntoSpan, SpanRangeExt};

clippy_lints/src/collapsible_if.rs

@@ -1,17 +1,3 @@
-//! Checks for if expressions that contain only an if expression.
-//!
-//! For example, the lint would catch:
-//!
-//! ```rust,ignore
-//! if x {
-//!     if y {
-//!         println!("Hello world");
-//!     }
-//! }
-//! ```
-//!
-//! This lint is **warn** by default
-
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
 use clippy_utils::source::{snippet, snippet_block, snippet_block_with_applicability};
 use clippy_utils::sugg::Sugg;

clippy_lints/src/collection_is_never_read.rs

@@ -1,5 +1,5 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
+use clippy_utils::ty::{get_type_diagnostic_name, is_type_lang_item};
 use clippy_utils::visitors::{for_each_expr, Visitable};
 use clippy_utils::{get_enclosing_block, path_to_local_id};
 use core::ops::ControlFlow;
@@ -7,7 +7,6 @@
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
 use rustc_span::symbol::sym;
-use rustc_span::Symbol;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -44,24 +43,11 @@
 }
 declare_lint_pass!(CollectionIsNeverRead => [COLLECTION_IS_NEVER_READ]);
 
-// Add `String` here when it is added to diagnostic items
-static COLLECTIONS: [Symbol; 9] = [
-    sym::BTreeMap,
-    sym::BTreeSet,
-    sym::BinaryHeap,
-    sym::HashMap,
-    sym::HashSet,
-    sym::LinkedList,
-    sym::Option,
-    sym::Vec,
-    sym::VecDeque,
-];
-
 impl<'tcx> LateLintPass<'tcx> for CollectionIsNeverRead {
     fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx LetStmt<'tcx>) {
         // Look for local variables whose type is a container. Search surrounding block for read access.
         if let PatKind::Binding(_, local_id, _, _) = local.pat.kind
-            && match_acceptable_type(cx, local, &COLLECTIONS)
+            && match_acceptable_type(cx, local)
             && let Some(enclosing_block) = get_enclosing_block(cx, local.hir_id)
             && has_no_read_access(cx, local_id, enclosing_block)
         {
@@ -70,11 +56,22 @@ fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx LetStmt<'tcx>) {
     }
 }
 
-fn match_acceptable_type(cx: &LateContext<'_>, local: &LetStmt<'_>, collections: &[Symbol]) -> bool {
+fn match_acceptable_type(cx: &LateContext<'_>, local: &LetStmt<'_>) -> bool {
     let ty = cx.typeck_results().pat_ty(local.pat);
-    collections.iter().any(|&sym| is_type_diagnostic_item(cx, ty, sym))
+    matches!(
-    // String type is a lang item but not a diagnostic item for now so we need a separate check
+        get_type_diagnostic_name(cx, ty),
-        || is_type_lang_item(cx, ty, LangItem::String)
+        Some(
+            sym::BTreeMap
+                | sym::BTreeSet
+                | sym::BinaryHeap
+                | sym::HashMap
+                | sym::HashSet
+                | sym::LinkedList
+                | sym::Option
+                | sym::Vec
+                | sym::VecDeque
+        )
+    ) || is_type_lang_item(cx, ty, LangItem::String)
 }
 
 fn has_no_read_access<'tcx, T: Visitable<'tcx>>(cx: &LateContext<'tcx>, id: HirId, block: T) -> bool {

clippy_lints/src/create_dir.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet_with_applicability;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
@@ -46,7 +46,7 @@ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
                 "calling `std::fs::create_dir` where there may be a better way",
                 |diag| {
                     let mut app = Applicability::MaybeIncorrect;
-                    diag.span_suggestion_with_style(
+                    diag.span_suggestion_verbose(
                         expr.span,
                         "consider calling `std::fs::create_dir_all` instead",
                         format!(
@@ -54,7 +54,6 @@ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
                             snippet_with_applicability(cx, arg.span, "..", &mut app)
                         ),
                         app,
-                        SuggestionStyle::ShowAlways,
                     );
                 },
             );

clippy_lints/src/doc/lazy_continuation.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use itertools::Itertools;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_lint::LateContext;
 use rustc_span::{BytePos, Span};
 use std::ops::Range;
@@ -59,12 +59,11 @@ pub(super) fn check(
                 && (doc_comment == "///" || doc_comment == "//!")
             {
                 // suggest filling in a blank line
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(
                     line_break_span.shrink_to_lo(),
                     "if this should be its own paragraph, add a blank doc comment line",
                     format!("\n{doc_comment}"),
                     Applicability::MaybeIncorrect,
-                    SuggestionStyle::ShowAlways,
                 );
                 if ccount > 0 || blockquote_level > 0 {
                     diag.help("if this not intended to be a quote at all, escape it with `\\>`");
@@ -79,12 +78,11 @@ pub(super) fn check(
             if ccount == 0 && blockquote_level == 0 {
                 // simpler suggestion style for indentation
                 let indent = list_indentation - lcount;
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(
                     span.shrink_to_hi(),
                     "indent this line",
                     std::iter::repeat(" ").take(indent).join(""),
                     Applicability::MaybeIncorrect,
-                    SuggestionStyle::ShowAlways,
                 );
                 diag.help("if this is supposed to be its own paragraph, add a blank line");
                 return;
@@ -107,12 +105,11 @@ pub(super) fn check(
                     suggested.push_str(text);
                 }
             }
-            diag.span_suggestion_with_style(
+            diag.span_suggestion_verbose(
                 span,
                 "add markers to start of line",
                 suggested,
                 Applicability::MachineApplicable,
-                SuggestionStyle::ShowAlways,
             );
             diag.help("if this not intended to be a quote at all, escape it with `\\>`");
         });

clippy_lints/src/doc/markdown.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
 use clippy_utils::source::snippet_with_applicability;
 use rustc_data_structures::fx::FxHashSet;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_lint::LateContext;
 use rustc_span::{BytePos, Pos, Span};
 use url::Url;
@@ -137,24 +137,15 @@ fn has_hyphen(s: &str) -> bool {
     }
 
     if has_underscore(word) || word.contains("::") || is_camel_case(word) || word.ends_with("()") {
-        let mut applicability = Applicability::MachineApplicable;
-
         span_lint_and_then(
             cx,
             DOC_MARKDOWN,
             span,
             "item in documentation is missing backticks",
             |diag| {
+                let mut applicability = Applicability::MachineApplicable;
                 let snippet = snippet_with_applicability(cx, span, "..", &mut applicability);
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(span, "try", format!("`{snippet}`"), applicability);
-                    span,
-                    "try",
-                    format!("`{snippet}`"),
-                    applicability,
-                    // always show the suggestion in a separate line, since the
-                    // inline presentation adds another pair of backticks
-                    SuggestionStyle::ShowAlways,
-                );
             },
         );
     }

clippy_lints/src/else_if_without_else.rs

@@ -1,5 +1,3 @@
-//! Lint on if expressions with an else if, but without a final else branch.
-
 use clippy_utils::diagnostics::span_lint_and_then;
 use rustc_ast::ast::{Expr, ExprKind};
 use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};

clippy_lints/src/empty_enum.rs

@@ -1,5 +1,3 @@
-//! lint when there is an enum with no variants
-
 use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_hir::{Item, ItemKind};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/enum_clike.rs

@@ -1,6 +1,3 @@
-//! lint on C-like enums that are `repr(isize/usize)` and have values that
-//! don't fit into an `i32`
-
 use clippy_utils::consts::{mir_to_const, Constant};
 use clippy_utils::diagnostics::span_lint;
 use rustc_hir::{Item, ItemKind};

clippy_lints/src/eta_reduction.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
 use clippy_utils::higher::VecArgs;
 use clippy_utils::source::snippet_opt;
-use clippy_utils::ty::type_diagnostic_name;
+use clippy_utils::ty::get_type_diagnostic_name;
 use clippy_utils::usage::{local_used_after_expr, local_used_in};
 use clippy_utils::{get_path_from_caller_to_method_type, is_adjusted, path_to_local, path_to_local_id};
 use rustc_errors::Applicability;
@@ -139,7 +139,7 @@ fn check_clousure<'tcx>(cx: &LateContext<'tcx>, outer_receiver: Option<&Expr<'tc
         {
             let callee_ty_raw = typeck.expr_ty(callee);
             let callee_ty = callee_ty_raw.peel_refs();
-            if matches!(type_diagnostic_name(cx, callee_ty), Some(sym::Arc | sym::Rc))
+            if matches!(get_type_diagnostic_name(cx, callee_ty), Some(sym::Arc | sym::Rc))
                 || !check_inputs(typeck, body.params, None, args)
             {
                 return;

clippy_lints/src/float_literal.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::numeric_literal;
 use rustc_ast::ast::{self, LitFloatType, LitKind};
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{self, FloatTy};
@@ -117,12 +117,11 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
                             if type_suffix.is_none() {
                                 float_str.push_str(".0");
                             }
-                            diag.span_suggestion_with_style(
+                            diag.span_suggestion_verbose(
                                 expr.span,
                                 "consider changing the type or replacing it with",
                                 numeric_literal::format(&float_str, type_suffix, true),
                                 Applicability::MachineApplicable,
-                                SuggestionStyle::ShowAlways,
                             );
                         },
                     );
@@ -134,12 +133,11 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
                     expr.span,
                     "float has excessive precision",
                     |diag| {
-                        diag.span_suggestion_with_style(
+                        diag.span_suggestion_verbose(
                             expr.span,
                             "consider changing the type or truncating it to",
                             numeric_literal::format(&float_str, type_suffix, true),
                             Applicability::MachineApplicable,
-                            SuggestionStyle::ShowAlways,
                         );
                     },
                 );

clippy_lints/src/functions/impl_trait_in_params.rs

@@ -1,6 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::is_in_test;
 
+use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Body, GenericParam, Generics, HirId, ImplItem, ImplItemKind, TraitItem, TraitItemKind};
@@ -18,20 +19,18 @@ fn report(cx: &LateContext<'_>, param: &GenericParam<'_>, generics: &Generics<'_
         |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(
+                diag.span_suggestion_verbose(
                     gen_span,
                     "add a type parameter",
                     format!(", {{ /* Generic name */ }}: {}", &param.name.ident().as_str()[5..]),
-                    rustc_errors::Applicability::HasPlaceholders,
+                    Applicability::HasPlaceholders,
-                    rustc_errors::SuggestionStyle::ShowAlways,
                 );
             } else {
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(
                     generics.span,
                     "add a type parameter",
                     format!("<{{ /* Generic name */ }}: {}>", &param.name.ident().as_str()[5..]),
-                    rustc_errors::Applicability::HasPlaceholders,
+                    Applicability::HasPlaceholders,
-                    rustc_errors::SuggestionStyle::ShowAlways,
                 );
             }
         },

clippy_lints/src/functions/must_use.rs

@@ -8,7 +8,7 @@
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::{self, Ty};
-use rustc_span::{sym, Span, Symbol};
+use rustc_span::{sym, Span};
 
 use clippy_utils::attrs::is_proc_macro;
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
@@ -193,17 +193,13 @@ fn is_mutable_pat(cx: &LateContext<'_>, pat: &hir::Pat<'_>, tys: &mut DefIdSet)
     }
 }
 
-static KNOWN_WRAPPER_TYS: &[Symbol] = &[sym::Rc, sym::Arc];
-
 fn is_mutable_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, tys: &mut DefIdSet) -> bool {
     match *ty.kind() {
         // primitive types are never mutable
         ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str => false,
         ty::Adt(adt, args) => {
             tys.insert(adt.did()) && !ty.is_freeze(cx.tcx, cx.param_env)
-                || KNOWN_WRAPPER_TYS
+                || matches!(cx.tcx.get_diagnostic_name(adt.did()), Some(sym::Rc | sym::Arc))
-                    .iter()
-                    .any(|&sym| cx.tcx.is_diagnostic_item(sym, adt.did()))
                     && args.types().any(|ty| is_mutable_ty(cx, ty, tys))
         },
         ty::Tuple(args) => args.iter().any(|ty| is_mutable_ty(cx, ty, tys)),

clippy_lints/src/if_not_else.rs

@@ -1,6 +1,3 @@
-//! lint on if branches that could be swapped so no `!` operation is necessary
-//! on the condition
-
 use clippy_utils::consts::{ConstEvalCtxt, Constant};
 use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::is_else_clause;

clippy_lints/src/implicit_return.rs

@@ -3,7 +3,7 @@
 use clippy_utils::visitors::for_each_expr_without_closures;
 use clippy_utils::{get_async_fn_body, is_async_fn, is_from_proc_macro};
 use core::ops::ControlFlow;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{Block, Body, Expr, ExprKind, FnDecl, FnRetTy, HirId};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
@@ -54,13 +54,7 @@ fn lint_return(cx: &LateContext<'_>, emission_place: HirId, span: Span) {
         |diag| {
             let mut app = Applicability::MachineApplicable;
             let snip = snippet_with_applicability(cx, span, "..", &mut app);
-            diag.span_suggestion_with_style(
+            diag.span_suggestion_verbose(span, "add `return` as shown", format!("return {snip}"), app);
-                span,
-                "add `return` as shown",
-                format!("return {snip}"),
-                app,
-                SuggestionStyle::ShowAlways,
-            );
         },
     );
 }
@@ -75,12 +69,11 @@ fn lint_break(cx: &LateContext<'_>, emission_place: HirId, break_span: Span, exp
         |diag| {
             let mut app = Applicability::MachineApplicable;
             let snip = snippet_with_context(cx, expr_span, break_span.ctxt(), "..", &mut app).0;
-            diag.span_suggestion_with_style(
+            diag.span_suggestion_verbose(
                 break_span,
                 "change `break` to `return` as shown",
                 format!("return {snip}"),
                 app,
-                SuggestionStyle::ShowAlways,
             );
         },
     );

clippy_lints/src/indexing_slicing.rs

@@ -1,5 +1,3 @@
-//! lint on indexing and slicing operations
-
 use clippy_config::Conf;
 use clippy_utils::consts::{ConstEvalCtxt, Constant};
 use clippy_utils::diagnostics::{span_lint, span_lint_and_then};

clippy_lints/src/infinite_iter.rs

@@ -1,10 +1,10 @@
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::higher;
-use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use clippy_utils::ty::{get_type_diagnostic_name, implements_trait};
 use rustc_hir::{BorrowKind, Closure, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::declare_lint_pass;
-use rustc_span::symbol::{sym, Symbol};
+use rustc_span::symbol::sym;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -210,18 +210,6 @@ fn is_infinite(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
     ("product", 0),
 ];
 
-/// the paths of types that are known to be infinitely allocating
-const INFINITE_COLLECTORS: &[Symbol] = &[
-    sym::BinaryHeap,
-    sym::BTreeMap,
-    sym::BTreeSet,
-    sym::HashMap,
-    sym::HashSet,
-    sym::LinkedList,
-    sym::Vec,
-    sym::VecDeque,
-];
-
 fn complete_infinite_iter(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
     match expr.kind {
         ExprKind::MethodCall(method, receiver, args, _) => {
@@ -248,10 +236,19 @@ fn complete_infinite_iter(cx: &LateContext<'_>, expr: &Expr<'_>) -> Finiteness {
                 }
             } else if method.ident.name == sym!(collect) {
                 let ty = cx.typeck_results().expr_ty(expr);
-                if INFINITE_COLLECTORS
+                if matches!(
-                    .iter()
+                    get_type_diagnostic_name(cx, ty),
-                    .any(|diag_item| is_type_diagnostic_item(cx, ty, *diag_item))
+                    Some(
-                {
+                        sym::BinaryHeap
+                            | sym::BTreeMap
+                            | sym::BTreeSet
+                            | sym::HashMap
+                            | sym::HashSet
+                            | sym::LinkedList
+                            | sym::Vec
+                            | sym::VecDeque,
+                    )
+                ) {
                     return is_infinite(cx, receiver);
                 }
             }

clippy_lints/src/inherent_impl.rs

@@ -1,5 +1,3 @@
-//! lint on inherent implementations
-
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::is_lint_allowed;
 use rustc_data_structures::fx::FxHashMap;

clippy_lints/src/inline_fn_without_body.rs

@@ -1,5 +1,3 @@
-//! checks for `#[inline]` on trait methods without bodies
-
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::sugg::DiagExt;
 use rustc_errors::Applicability;

clippy_lints/src/int_plus_one.rs

@@ -1,5 +1,3 @@
-//! lint on blocks unnecessarily using >= with a + 1 or - 1
-
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_opt;
 use rustc_ast::ast::{BinOpKind, Expr, ExprKind, LitKind};

clippy_lints/src/item_name_repetitions.rs

@@ -1,5 +1,3 @@
-//! lint on enum variants that are prefixed or suffixed by the same characters
-
 use clippy_config::Conf;
 use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_hir};
 use clippy_utils::is_bool;

clippy_lints/src/items_after_statements.rs

@@ -1,5 +1,3 @@
-//! lint when items are used after statements
-
 use clippy_utils::diagnostics::span_lint_hir;
 use rustc_hir::{Block, ItemKind, StmtKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};

clippy_lints/src/large_enum_variant.rs

@@ -1,5 +1,3 @@
-//! lint when there is a large size difference between variants on an enum
-
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet_with_applicability;

clippy_lints/src/legacy_numeric_constants.rs

@@ -3,7 +3,7 @@
 use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir_and_then};
 use clippy_utils::{get_parent_expr, is_from_proc_macro};
 use hir::def_id::DefId;
-use rustc_errors::{Applicability, SuggestionStyle};
+use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::{ExprKind, Item, ItemKind, QPath, UseKind};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
@@ -143,12 +143,11 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx rustc_hir::Expr<'tc
             && !is_from_proc_macro(cx, expr)
         {
             span_lint_hir_and_then(cx, LEGACY_NUMERIC_CONSTANTS, expr.hir_id, span, msg, |diag| {
-                diag.span_suggestion_with_style(
+                diag.span_suggestion_verbose(
                     span,
                     "use the associated constant instead",
                     sugg,
                     Applicability::MaybeIncorrect,
-                    SuggestionStyle::ShowAlways,
                 );
             });
         }

clippy_lints/src/literal_representation.rs

@@ -1,6 +1,3 @@
-//! Lints concerned with the grouping of digits with underscores in integral or
-//! floating-point literal expressions.
-
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::numeric_literal::{NumericLiteral, Radix};

clippy_lints/src/manual_retain.rs

@@ -2,14 +2,14 @@
 use clippy_config::Conf;
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet;
-use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
+use clippy_utils::ty::{get_type_diagnostic_name, is_type_lang_item};
 use clippy_utils::{match_def_path, paths, SpanlessEq};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_hir::ExprKind::Assign;
 use rustc_lint::{LateContext, LateLintPass};
-use rustc_session::{impl_lint_pass, RustcVersion};
+use rustc_session::impl_lint_pass;
 use rustc_span::symbol::sym;
 use rustc_span::Span;
 
@@ -20,16 +20,6 @@
     &paths::SLICE_INTO,
     &paths::VEC_DEQUE_ITER,
 ];
-const ACCEPTABLE_TYPES: [(rustc_span::Symbol, Option<RustcVersion>); 7] = [
-    (sym::BinaryHeap, Some(msrvs::BINARY_HEAP_RETAIN)),
-    (sym::BTreeSet, Some(msrvs::BTREE_SET_RETAIN)),
-    (sym::BTreeMap, Some(msrvs::BTREE_MAP_RETAIN)),
-    (sym::HashSet, Some(msrvs::HASH_SET_RETAIN)),
-    (sym::HashMap, Some(msrvs::HASH_MAP_RETAIN)),
-    (sym::Vec, None),
-    (sym::VecDeque, None),
-];
-const MAP_TYPES: [rustc_span::Symbol; 2] = [sym::BTreeMap, sym::HashMap];
 
 declare_clippy_lint! {
     /// ### What it does
@@ -264,16 +254,22 @@ fn match_acceptable_def_path(cx: &LateContext<'_>, collect_def_id: DefId) -> boo
 }
 
 fn match_acceptable_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>, msrv: &Msrv) -> bool {
-    let expr_ty = cx.typeck_results().expr_ty(expr).peel_refs();
+    let ty = cx.typeck_results().expr_ty(expr).peel_refs();
-    ACCEPTABLE_TYPES.iter().any(|(ty, acceptable_msrv)| {
+    let required = match get_type_diagnostic_name(cx, ty) {
-        is_type_diagnostic_item(cx, expr_ty, *ty)
+        Some(sym::BinaryHeap) => msrvs::BINARY_HEAP_RETAIN,
-            && acceptable_msrv.map_or(true, |acceptable_msrv| msrv.meets(acceptable_msrv))
+        Some(sym::BTreeSet) => msrvs::BTREE_SET_RETAIN,
-    })
+        Some(sym::BTreeMap) => msrvs::BTREE_MAP_RETAIN,
+        Some(sym::HashSet) => msrvs::HASH_SET_RETAIN,
+        Some(sym::HashMap) => msrvs::HASH_MAP_RETAIN,
+        Some(sym::Vec | sym::VecDeque) => return true,
+        _ => return false,
+    };
+    msrv.meets(required)
 }
 
 fn match_map_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
-    let expr_ty = cx.typeck_results().expr_ty(expr).peel_refs();
+    let ty = cx.typeck_results().expr_ty(expr).peel_refs();
-    MAP_TYPES.iter().any(|ty| is_type_diagnostic_item(cx, expr_ty, *ty))
+    matches!(get_type_diagnostic_name(cx, ty), Some(sym::BTreeMap | sym::HashMap))
 }
 
 fn make_span_lint_and_sugg(cx: &LateContext<'_>, span: Span, sugg: String) {

clippy_lints/src/methods/get_unwrap.rs

@@ -74,7 +74,7 @@ pub(super) fn check<'tcx>(
                 "&"
             };
 
-            diag.span_suggestion_with_style(
+            diag.span_suggestion_verbose(
                 span,
                 "using `[]` is clearer and more concise",
                 format!(
@@ -82,7 +82,6 @@ pub(super) fn check<'tcx>(
                     snippet_with_applicability(cx, recv.span, "..", &mut applicability)
                 ),
                 applicability,
-                rustc_errors::SuggestionStyle::ShowAlways,
             );
         },
     );

clippy_lints/src/methods/is_digit_ascii_radix.rs

@@ -1,5 +1,3 @@
-//! Lint for `c.is_digit(10)`
-
 use super::IS_DIGIT_ASCII_RADIX;
 use clippy_config::msrvs::{self, Msrv};
 use clippy_utils::consts::{ConstEvalCtxt, FullInt};

clippy_lints/src/methods/needless_collect.rs

@@ -2,7 +2,7 @@
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
 use clippy_utils::source::{snippet, snippet_with_applicability};
 use clippy_utils::sugg::Sugg;
-use clippy_utils::ty::{is_type_diagnostic_item, make_normalized_projection, make_projection};
+use clippy_utils::ty::{get_type_diagnostic_name, make_normalized_projection, make_projection};
 use clippy_utils::{
     can_move_expr_to_closure, fn_def_id, get_enclosing_block, higher, is_trait_method, path_to_local, path_to_local_id,
     CaptureKind,
@@ -88,9 +88,10 @@ pub(super) fn check<'tcx>(
         Node::LetStmt(l) => {
             if let PatKind::Binding(BindingMode::NONE | BindingMode::MUT, id, _, None) = l.pat.kind
                 && let ty = cx.typeck_results().expr_ty(collect_expr)
-                && [sym::Vec, sym::VecDeque, sym::BinaryHeap, sym::LinkedList]
+                && matches!(
-                    .into_iter()
+                    get_type_diagnostic_name(cx, ty),
-                    .any(|item| is_type_diagnostic_item(cx, ty, item))
+                    Some(sym::Vec | sym::VecDeque | sym::BinaryHeap | sym::LinkedList)
+                )
                 && let iter_ty = cx.typeck_results().expr_ty(iter_expr)
                 && let Some(block) = get_enclosing_block(cx, l.hir_id)
                 && let Some(iter_calls) = detect_iter_and_into_iters(block, id, cx, get_captured_ids(cx, iter_ty))

clippy_lints/src/mut_key.rs

@@ -125,14 +125,12 @@ fn check_sig(&mut self, cx: &LateContext<'tcx>, fn_def_id: LocalDefId, decl: &hi
     // generics (because the compiler cannot ensure immutability for unknown types).
     fn check_ty_(&mut self, cx: &LateContext<'tcx>, span: Span, ty: Ty<'tcx>) {
         let ty = ty.peel_refs();
-        if let ty::Adt(def, args) = ty.kind() {
+        if let ty::Adt(def, args) = ty.kind()
-            let is_keyed_type = [sym::HashMap, sym::BTreeMap, sym::HashSet, sym::BTreeSet]
+            && matches!(
-                .iter()
+                cx.tcx.get_diagnostic_name(def.did()),
-                .any(|diag_item| cx.tcx.is_diagnostic_item(*diag_item, def.did()));
+                Some(sym::HashMap | sym::BTreeMap | sym::HashSet | sym::BTreeSet)
-            if !is_keyed_type {
+            )
-                return;
+        {
-            }
-
             let subst_ty = args.type_at(0);
             if self.interior_mut.is_interior_mut_ty(cx, subst_ty) {
                 span_lint(cx, MUTABLE_KEY_TYPE, span, "mutable key type");

clippy_lints/src/mutex_atomic.rs

@@ -1,7 +1,3 @@
-//! Checks for usage of mutex where an atomic value could be used
-//!
-//! This lint is **allow** by default
-
 use clippy_utils::diagnostics::span_lint;
 use clippy_utils::ty::is_type_diagnostic_item;
 use rustc_hir::Expr;

clippy_lints/src/needless_bool.rs

@@ -1,7 +1,3 @@
-//! Checks for needless boolean results of if-else expressions
-//!
-//! This lint is **warn** by default
-
 use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
 use clippy_utils::source::snippet_with_applicability;
 use clippy_utils::sugg::Sugg;

clippy_lints/src/needless_continue.rs

@@ -1,38 +1,3 @@
-//! Checks for continue statements in loops that are redundant.
-//!
-//! For example, the lint would catch
-//!
-//! ```rust
-//! let mut a = 1;
-//! let x = true;
-//!
-//! while a < 5 {
-//!     a = 6;
-//!     if x {
-//!         // ...
-//!     } else {
-//!         continue;
-//!     }
-//!     println!("Hello, world");
-//! }
-//! ```
-//!
-//! And suggest something like this:
-//!
-//! ```rust
-//! let mut a = 1;
-//! let x = true;
-//!
-//! while a < 5 {
-//!     a = 6;
-//!     if x {
-//!         // ...
-//!         println!("Hello, world");
-//!     }
-//! }
-//! ```
-//!
-//! This lint is **warn** by default.
 use clippy_utils::diagnostics::span_lint_and_help;
 use clippy_utils::source::{indent_of, snippet, snippet_block};
 use rustc_ast::ast;

clippy_lints/src/non_copy_const.rs

@@ -1,7 +1,3 @@
-//! Checks for usage of const which the type is not `Freeze` (`Cell`-free).
-//!
-//! This lint is **warn** by default.
-
 use std::ptr;
 
 use clippy_config::Conf;

clippy_lints/src/ptr.rs

@@ -1,5 +1,3 @@
-//! Checks for usage of  `&Vec[_]` and `&String`.
-
 use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then, span_lint_hir_and_then};
 use clippy_utils::source::SpanRangeExt;
 use clippy_utils::ty::expr_sig;

clippy_lints/src/size_of_in_element_count.rs

@@ -1,6 +1,3 @@
-//! Lint on use of `size_of` or `size_of_val` of T in an expression
-//! expecting a count of T
-
 use clippy_utils::diagnostics::span_lint_and_help;
 use rustc_hir::{BinOpKind, Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};

clippy_lints/src/utils/author.rs

@@ -1,6 +1,3 @@
-//! A group of attributes that can be attached to Rust code in order
-//! to generate a clippy lint detecting said code automatically.
-
 use clippy_utils::{get_attr, higher};
 use rustc_ast::ast::{LitFloatType, LitKind};
 use rustc_ast::LitIntType;

clippy_utils/src/ty.rs

@@ -455,11 +455,6 @@ pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: LangItem)
     }
 }
 
-/// Gets the diagnostic name of the type, if it has one
-pub fn type_diagnostic_name(cx: &LateContext<'_>, ty: Ty<'_>) -> Option<Symbol> {
-    ty.ty_adt_def().and_then(|adt| cx.tcx.get_diagnostic_name(adt.did()))
-}
-
 /// Return `true` if the passed `typ` is `isize` or `usize`.
 pub fn is_isize_or_usize(typ: Ty<'_>) -> bool {
     matches!(typ.kind(), ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize))