Rollup of 11 pull requests

compiler/rustc_error_messages/src/lib.rs

@@ -299,7 +299,7 @@ impl DiagnosticMessage {
     /// - If `self` is non-translatable then return `self`'s message.
     pub fn with_subdiagnostic_message(&self, sub: SubdiagnosticMessage) -> Self {
         let attr = match sub {
-            SubdiagnosticMessage::Str(s) => return DiagnosticMessage::Str(s.clone()),
+            SubdiagnosticMessage::Str(s) => return DiagnosticMessage::Str(s),
             SubdiagnosticMessage::FluentIdentifier(id) => {
                 return DiagnosticMessage::FluentIdentifier(id, None);
             }

compiler/rustc_index/src/vec.rs

@@ -234,7 +234,9 @@ impl<I: Idx, T> IndexVec<I, T> {
         self.raw.get_mut(index.index())
     }
 
-    /// Returns mutable references to two distinct elements, a and b. Panics if a == b.
+    /// Returns mutable references to two distinct elements, `a` and `b`.
+    ///
+    /// Panics if `a == b`.
     #[inline]
     pub fn pick2_mut(&mut self, a: I, b: I) -> (&mut T, &mut T) {
         let (ai, bi) = (a.index(), b.index());
@@ -249,7 +251,9 @@ impl<I: Idx, T> IndexVec<I, T> {
         }
     }
 
-    /// Returns mutable references to three distinct elements or panics otherwise.
+    /// Returns mutable references to three distinct elements.
+    ///
+    /// Panics if the elements are not distinct.
     #[inline]
     pub fn pick3_mut(&mut self, a: I, b: I, c: I) -> (&mut T, &mut T, &mut T) {
         let (ai, bi, ci) = (a.index(), b.index(), c.index());

compiler/rustc_macros/src/diagnostics/diagnostic_builder.rs

@@ -212,7 +212,7 @@ impl DiagnosticDeriveBuilder {
                 }
                 NestedMeta::Meta(meta @ Meta::NameValue(_))
                     if !is_help_note_or_warn
-                        && meta.path().segments.last().unwrap().ident.to_string() == "code" =>
+                        && meta.path().segments.last().unwrap().ident == "code" =>
                 {
                     // don't error for valid follow-up attributes
                 }

compiler/rustc_macros/src/diagnostics/fluent.rs

@@ -194,8 +194,8 @@ pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::Tok
                 let snake_name = Ident::new(
                     // FIXME: should probably trim prefix, not replace all occurrences
                     &name
-                        .replace(&format!("{}-", res.ident).replace("_", "-"), "")
-                        .replace("-", "_"),
+                        .replace(&format!("{}-", res.ident).replace('_', "-"), "")
+                        .replace('-', "_"),
                     span,
                 );
                 constants.extend(quote! {
@@ -207,7 +207,7 @@ pub(crate) fn fluent_messages(input: proc_macro::TokenStream) -> proc_macro::Tok
                 });
 
                 for Attribute { id: Identifier { name: attr_name }, .. } in attributes {
-                    let snake_name = Ident::new(&attr_name.replace("-", "_"), span);
+                    let snake_name = Ident::new(&attr_name.replace('-', "_"), span);
                     if !previous_attrs.insert(snake_name.clone()) {
                         continue;
                     }

compiler/rustc_middle/src/ty/consts/valtree.rs

@@ -88,19 +88,17 @@ impl<'tcx> ValTree<'tcx> {
                     let leafs = self
                         .unwrap_branch()
                         .into_iter()
-                        .map(|v| v.unwrap_leaf().try_to_u8().unwrap())
-                        .collect::<Vec<_>>();
+                        .map(|v| v.unwrap_leaf().try_to_u8().unwrap());
 
-                    return Some(tcx.arena.alloc_from_iter(leafs.into_iter()));
+                    return Some(tcx.arena.alloc_from_iter(leafs));
                 }
                 ty::Slice(slice_ty) if *slice_ty == tcx.types.u8 => {
                     let leafs = self
                         .unwrap_branch()
                         .into_iter()
-                        .map(|v| v.unwrap_leaf().try_to_u8().unwrap())
-                        .collect::<Vec<_>>();
+                        .map(|v| v.unwrap_leaf().try_to_u8().unwrap());
 
-                    return Some(tcx.arena.alloc_from_iter(leafs.into_iter()));
+                    return Some(tcx.arena.alloc_from_iter(leafs));
                 }
                 _ => {}
             },

compiler/rustc_middle/src/ty/mod.rs

@@ -790,22 +790,15 @@ pub struct TraitPredicate<'tcx> {
 pub type PolyTraitPredicate<'tcx> = ty::Binder<'tcx, TraitPredicate<'tcx>>;
 
 impl<'tcx> TraitPredicate<'tcx> {
-    pub fn remap_constness(&mut self, tcx: TyCtxt<'tcx>, param_env: &mut ParamEnv<'tcx>) {
-        if std::intrinsics::unlikely(Some(self.trait_ref.def_id) == tcx.lang_items().drop_trait()) {
-            // remap without changing constness of this predicate.
-            // this is because `T: ~const Drop` has a different meaning to `T: Drop`
-            // FIXME(fee1-dead): remove this logic after beta bump
-            param_env.remap_constness_with(self.constness)
-        } else {
-            *param_env = param_env.with_constness(self.constness.and(param_env.constness()))
-        }
+    pub fn remap_constness(&mut self, param_env: &mut ParamEnv<'tcx>) {
+        *param_env = param_env.with_constness(self.constness.and(param_env.constness()))
     }
 
     /// Remap the constness of this predicate before emitting it for diagnostics.
     pub fn remap_constness_diag(&mut self, param_env: ParamEnv<'tcx>) {
         // this is different to `remap_constness` that callees want to print this predicate
         // in case of selection errors. `T: ~const Drop` bounds cannot end up here when the
-        // param_env is not const because we it is always satisfied in non-const contexts.
+        // param_env is not const because it is always satisfied in non-const contexts.
         if let hir::Constness::NotConst = param_env.constness() {
             self.constness = ty::BoundConstness::NotConst;
         }

compiler/rustc_privacy/src/lib.rs

@@ -1754,7 +1754,6 @@ impl SearchInterfaceForPrivateItemsVisitor<'_> {
                 || self.in_assoc_ty
                 || self.tcx.resolutions(()).has_pub_restricted
             {
-                let descr = descr.to_string();
                 let vis_span =
                     self.tcx.sess.source_map().guess_head_span(self.tcx.def_span(def_id));
                 if kind == "trait" {

compiler/rustc_resolve/src/diagnostics.rs

@@ -2608,7 +2608,7 @@ fn show_candidates(
                 "item"
             };
             let plural_descr =
-                if descr.ends_with("s") { format!("{}es", descr) } else { format!("{}s", descr) };
+                if descr.ends_with('s') { format!("{}es", descr) } else { format!("{}s", descr) };
 
             let mut msg = format!("{}these {} exist but are inaccessible", prefix, plural_descr);
             let mut has_colon = false;

compiler/rustc_session/src/options.rs

@@ -535,7 +535,7 @@ mod parse {
     ) -> bool {
         match v {
             Some(s) => {
-                for s in s.split(",") {
+                for s in s.split(',') {
                     let Some(pass_name) = s.strip_prefix(&['+', '-'][..]) else { return false };
                     slot.push((pass_name.to_string(), &s[..1] == "+"));
                 }