Improve/cleanup rustdoc code

src/librustdoc/clean/mod.rs

@@ -894,7 +894,7 @@ fn clean_ty_generics<'tcx>(
 
         // Add back a `Sized` bound if there are no *trait* bounds remaining (incl. `?Sized`).
         // Since all potential trait bounds are at the front we can just check the first bound.
-        if bounds.first().map_or(true, |b| !b.is_trait_bound()) {
+        if bounds.first().is_none_or(|b| !b.is_trait_bound()) {
             bounds.insert(0, GenericBound::sized(cx));
         }
 
@@ -1811,7 +1811,7 @@ pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> T
         }
         TyKind::Slice(ty) => Slice(Box::new(clean_ty(ty, cx))),
         TyKind::Pat(ty, pat) => Type::Pat(Box::new(clean_ty(ty, cx)), format!("{pat:?}").into()),
-        TyKind::Array(ty, ref const_arg) => {
+        TyKind::Array(ty, const_arg) => {
             // NOTE(min_const_generics): We can't use `const_eval_poly` for constants
             // as we currently do not supply the parent generics to anonymous constants
             // but do allow `ConstKind::Param`.
@@ -2337,7 +2337,7 @@ fn clean_middle_opaque_bounds<'tcx>(
 
     // Add back a `Sized` bound if there are no *trait* bounds remaining (incl. `?Sized`).
     // Since all potential trait bounds are at the front we can just check the first bound.
-    if bounds.first().map_or(true, |b| !b.is_trait_bound()) {
+    if bounds.first().is_none_or(|b| !b.is_trait_bound()) {
         bounds.insert(0, GenericBound::sized(cx));
     }
 

src/librustdoc/doctest.rs

@@ -220,7 +220,7 @@ pub(crate) fn run(dcx: DiagCtxtHandle<'_>, input: Input, options: RustdocOptions
     } = interface::run_compiler(config, |compiler| {
         let krate = rustc_interface::passes::parse(&compiler.sess);
 
-        let collector = rustc_interface::create_and_enter_global_ctxt(&compiler, krate, |tcx| {
+        let collector = rustc_interface::create_and_enter_global_ctxt(compiler, krate, |tcx| {
             let crate_name = tcx.crate_name(LOCAL_CRATE).to_string();
             let crate_attrs = tcx.hir().attrs(CRATE_HIR_ID);
             let opts = scrape_test_config(crate_name, crate_attrs, args_path);

src/librustdoc/doctest/make.rs

@@ -538,7 +538,7 @@ fn handle_attr(mod_attr_pending: &mut String, source_info: &mut SourceInfo, edit
         // If it's complete, then we can clear the pending content.
         mod_attr_pending.clear();
     } else {
-        mod_attr_pending.push_str("\n");
+        mod_attr_pending.push('\n');
     }
 }
 

src/librustdoc/formats/cache.rs

@@ -413,7 +413,7 @@ impl DocFolder for CacheBuilder<'_, '_> {
             let impl_item = Impl { impl_item: item };
             let impl_did = impl_item.def_id();
             let trait_did = impl_item.trait_did();
-            if trait_did.map_or(true, |d| self.cache.traits.contains_key(&d)) {
+            if trait_did.is_none_or(|d| self.cache.traits.contains_key(&d)) {
                 for did in dids {
                     if self.impl_ids.entry(did).or_default().insert(impl_did) {
                         self.cache.impls.entry(did).or_default().push(impl_item.clone());

src/librustdoc/html/escape.rs

@@ -104,10 +104,9 @@ impl fmt::Display for EscapeBodyTextWithWbr<'_> {
                 continue;
             }
             let is_uppercase = || s.chars().any(|c| c.is_uppercase());
-            let next_is_uppercase =
-                || pk.map_or(true, |(_, t)| t.chars().any(|c| c.is_uppercase()));
-            let next_is_underscore = || pk.map_or(true, |(_, t)| t.contains('_'));
-            let next_is_colon = || pk.map_or(true, |(_, t)| t.contains(':'));
+            let next_is_uppercase = || pk.is_none_or(|(_, t)| t.chars().any(|c| c.is_uppercase()));
+            let next_is_underscore = || pk.is_none_or(|(_, t)| t.contains('_'));
+            let next_is_colon = || pk.is_none_or(|(_, t)| t.contains(':'));
             // Check for CamelCase.
             //
             // `i - last > 3` avoids turning FmRadio into Fm<wbr>Radio, which is technically

src/librustdoc/html/markdown.rs

@@ -480,7 +480,7 @@ impl<'a, I: Iterator<Item = SpannedEvent<'a>>> Iterator for SpannedLinkReplacer<
     type Item = SpannedEvent<'a>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let Some((mut event, range)) = self.iter.next() else { return None };
+        let (mut event, range) = self.iter.next()?;
         self.inner.handle_event(&mut event);
         // Yield the modified event
         Some((event, range))
@@ -2039,7 +2039,7 @@ impl IdMap {
                 let candidate = candidate.to_string();
                 if is_default_id(&candidate) {
                     let id = format!("{}-{}", candidate, 1);
-                    self.map.insert(candidate.into(), 2);
+                    self.map.insert(candidate, 2);
                     id
                 } else {
                     candidate
@@ -2052,7 +2052,7 @@ impl IdMap {
             }
         };
 
-        self.map.insert(id.clone().into(), 1);
+        self.map.insert(id.clone(), 1);
         id
     }
 

src/librustdoc/html/render/context.rs

@@ -748,7 +748,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
                 &shared.layout,
                 &page,
                 "",
-                scrape_examples_help(&shared),
+                scrape_examples_help(shared),
                 &shared.style_files,
             );
             shared.fs.write(scrape_examples_help_file, v)?;

src/librustdoc/html/render/mod.rs

@@ -1974,7 +1974,7 @@ fn render_impl(
             .opt_doc_value()
             .map(|dox| {
                 Markdown {
-                    content: &*dox,
+                    content: &dox,
                     links: &i.impl_item.links(cx),
                     ids: &mut cx.id_map.borrow_mut(),
                     error_codes: cx.shared.codes,

src/librustdoc/html/render/print_item.rs

@@ -1420,7 +1420,7 @@ fn item_union(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, s: &clean::Uni
             ty: &'a clean::Type,
         ) -> impl fmt::Display + Captures<'a> + 'b + Captures<'cx> {
             display_fn(move |f| {
-                let v = ty.print(&self.cx);
+                let v = ty.print(self.cx);
                 write!(f, "{v}")
             })
         }

src/librustdoc/json/conversions.rs

@@ -312,15 +312,15 @@ fn from_clean_item(item: clean::Item, renderer: &JsonRenderer<'_>) -> ItemEnum {
         StructFieldItem(f) => ItemEnum::StructField(f.into_json(renderer)),
         EnumItem(e) => ItemEnum::Enum(e.into_json(renderer)),
         VariantItem(v) => ItemEnum::Variant(v.into_json(renderer)),
-        FunctionItem(f) => ItemEnum::Function(from_function(f, true, header.unwrap(), renderer)),
+        FunctionItem(f) => ItemEnum::Function(from_function(*f, true, header.unwrap(), renderer)),
         ForeignFunctionItem(f, _) => {
-            ItemEnum::Function(from_function(f, false, header.unwrap(), renderer))
+            ItemEnum::Function(from_function(*f, false, header.unwrap(), renderer))
         }
         TraitItem(t) => ItemEnum::Trait((*t).into_json(renderer)),
         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_json(renderer)),
-        MethodItem(m, _) => ItemEnum::Function(from_function(m, true, header.unwrap(), renderer)),
+        MethodItem(m, _) => ItemEnum::Function(from_function(*m, true, header.unwrap(), renderer)),
         RequiredMethodItem(m) => {
-            ItemEnum::Function(from_function(m, false, header.unwrap(), renderer))
+            ItemEnum::Function(from_function(*m, false, header.unwrap(), renderer))
         }
         ImplItem(i) => ItemEnum::Impl((*i).into_json(renderer)),
         StaticItem(s) => ItemEnum::Static(convert_static(s, rustc_hir::Safety::Safe, renderer)),
@@ -730,12 +730,11 @@ impl FromClean<clean::Impl> for Impl {
 }
 
 pub(crate) fn from_function(
-    function: Box<clean::Function>,
+    clean::Function { decl, generics }: clean::Function,
     has_body: bool,
     header: rustc_hir::FnHeader,
     renderer: &JsonRenderer<'_>,
 ) -> Function {
-    let clean::Function { decl, generics } = *function;
     Function {
         sig: decl.into_json(renderer),
         generics: generics.into_json(renderer),

src/librustdoc/lib.rs

@@ -869,7 +869,7 @@ fn main_args(
             sess.dcx().fatal("Compilation failed, aborting rustdoc");
         }
 
-        rustc_interface::create_and_enter_global_ctxt(&compiler, krate, |tcx| {
+        rustc_interface::create_and_enter_global_ctxt(compiler, krate, |tcx| {
             let (krate, render_opts, mut cache) = sess.time("run_global_ctxt", || {
                 core::run_global_ctxt(tcx, show_coverage, render_options, output_format)
             });

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1977,7 +1977,7 @@ fn resolution_failure(
                         }
 
                         if !path_str.contains("::") {
-                            if disambiguator.map_or(true, |d| d.ns() == MacroNS)
+                            if disambiguator.is_none_or(|d| d.ns() == MacroNS)
                                 && collector
                                     .cx
                                     .tcx