Auto merge of rust-lang#99567 - matthiaskrgr:rollup-08hh3r4, r=matthiaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#98707 (std: use futex-based locks on Fuchsia)
 - rust-lang#99413 (Add `PhantomData` marker for dropck to `BTreeMap`)
 - rust-lang#99454 (Add map_continue and continue_value combinators to ControlFlow)
 - rust-lang#99523 (Fix the stable version of `AsFd for Arc<T>` and `Box<T>`)
 - rust-lang#99526 (Normalize the arg spans to be within the call span)
 - rust-lang#99528 (couple of clippy::perf fixes)
 - rust-lang#99549 (Add regression test for rust-lang#52304)
 - rust-lang#99552 (Rewrite `orphan_check_trait_ref` to use a `TypeVisitor`)
 - rust-lang#99557 (Edit `rustc_index::vec::IndexVec::pick3_mut` docs)
 - rust-lang#99558 (Fix `remap_constness`)
 - rust-lang#99559 (Remove unused field in ItemKind::KeywordItem)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

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());