Rollup of 10 pull requests

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
   # If you want to modify CI jobs, take a look at src/ci/github-actions/jobs.yml.
   calculate_matrix:
     name: Calculate job matrix
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-24.04-arm
     outputs:
       jobs: ${{ steps.jobs.outputs.jobs }}
       run_type: ${{ steps.jobs.outputs.run_type }}

compiler/rustc_mir_transform/src/match_branches.rs

@@ -284,12 +284,14 @@ fn can_cast(
     let v = match src_layout.ty.kind() {
         ty::Uint(_) => from_scalar.to_uint(src_layout.size),
         ty::Int(_) => from_scalar.to_int(src_layout.size) as u128,
-        _ => unreachable!("invalid int"),
+        // We can also transform the values of other integer representations (such as char),
+        // although this may not be practical in real-world scenarios.
+        _ => return false,
     };
     let size = match *cast_ty.kind() {
         ty::Int(t) => Integer::from_int_ty(&tcx, t).size(),
         ty::Uint(t) => Integer::from_uint_ty(&tcx, t).size(),
-        _ => unreachable!("invalid int"),
+        _ => return false,
     };
     let v = size.truncate(v);
     let cast_scalar = ScalarInt::try_from_uint(v, size).unwrap();

compiler/rustc_parse/src/parser/expr.rs

@@ -3311,26 +3311,44 @@ impl<'a> Parser<'a> {
                             let sm = this.psess.source_map();
                             if let Ok(expr_lines) = sm.span_to_lines(expr_span)
                                 && let Ok(arm_start_lines) = sm.span_to_lines(arm_start_span)
-                                && arm_start_lines.lines[0].end_col == expr_lines.lines[0].end_col
                                 && expr_lines.lines.len() == 2
                             {
-                                // We check whether there's any trailing code in the parse span,
-                                // if there isn't, we very likely have the following:
-                                //
-                                // X |     &Y => "y"
-                                //   |        --    - missing comma
-                                //   |        |
-                                //   |        arrow_span
-                                // X |     &X => "x"
-                                //   |      - ^^ self.token.span
-                                //   |      |
-                                //   |      parsed until here as `"y" & X`
-                                err.span_suggestion_short(
-                                    arm_start_span.shrink_to_hi(),
-                                    "missing a comma here to end this `match` arm",
-                                    ",",
-                                    Applicability::MachineApplicable,
-                                );
+                                if arm_start_lines.lines[0].end_col == expr_lines.lines[0].end_col {
+                                    // We check whether there's any trailing code in the parse span,
+                                    // if there isn't, we very likely have the following:
+                                    //
+                                    // X |     &Y => "y"
+                                    //   |        --    - missing comma
+                                    //   |        |
+                                    //   |        arrow_span
+                                    // X |     &X => "x"
+                                    //   |      - ^^ self.token.span
+                                    //   |      |
+                                    //   |      parsed until here as `"y" & X`
+                                    err.span_suggestion_short(
+                                        arm_start_span.shrink_to_hi(),
+                                        "missing a comma here to end this `match` arm",
+                                        ",",
+                                        Applicability::MachineApplicable,
+                                    );
+                                } else if arm_start_lines.lines[0].end_col + rustc_span::CharPos(1)
+                                    == expr_lines.lines[0].end_col
+                                {
+                                    // similar to the above, but we may typo a `.` or `/` at the end of the line
+                                    let comma_span = arm_start_span
+                                        .shrink_to_hi()
+                                        .with_hi(arm_start_span.hi() + rustc_span::BytePos(1));
+                                    if let Ok(res) = sm.span_to_snippet(comma_span)
+                                        && (res == "." || res == "/")
+                                    {
+                                        err.span_suggestion_short(
+                                            comma_span,
+                                            "you might have meant to write a `,` to end this `match` arm",
+                                            ",",
+                                            Applicability::MachineApplicable,
+                                        );
+                                    }
+                                }
                             }
                         } else {
                             err.span_label(

compiler/rustc_resolve/src/late.rs

@@ -934,8 +934,7 @@ impl<'ra: 'ast, 'ast, 'tcx> Visitor<'ast> for LateResolutionVisitor<'_, 'ast, 'r
                 )
             }
             TyKind::UnsafeBinder(unsafe_binder) => {
-                // FIXME(unsafe_binder): Better span
-                let span = ty.span;
+                let span = ty.span.shrink_to_lo().to(unsafe_binder.inner_ty.span.shrink_to_lo());
                 self.with_generic_param_rib(
                     &unsafe_binder.generic_params,
                     RibKind::Normal,

library/alloc/src/collections/btree/map.rs

@@ -1151,7 +1151,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
         K: Ord,
         F: FnMut(&K, &mut V) -> bool,
     {
-        self.extract_if(|k, v| !f(k, v)).for_each(drop);
+        self.extract_if(.., |k, v| !f(k, v)).for_each(drop);
     }
 
     /// Moves all elements from `other` into `self`, leaving `other` empty.
@@ -1397,7 +1397,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
         }
     }
 
-    /// Creates an iterator that visits all elements (key-value pairs) in
+    /// Creates an iterator that visits elements (key-value pairs) in the specified range in
     /// ascending key order and uses a closure to determine if an element
     /// should be removed.
     ///
@@ -1423,33 +1423,42 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
     /// use std::collections::BTreeMap;
     ///
     /// let mut map: BTreeMap<i32, i32> = (0..8).map(|x| (x, x)).collect();
-    /// let evens: BTreeMap<_, _> = map.extract_if(|k, _v| k % 2 == 0).collect();
+    /// let evens: BTreeMap<_, _> = map.extract_if(.., |k, _v| k % 2 == 0).collect();
     /// let odds = map;
     /// assert_eq!(evens.keys().copied().collect::<Vec<_>>(), [0, 2, 4, 6]);
     /// assert_eq!(odds.keys().copied().collect::<Vec<_>>(), [1, 3, 5, 7]);
+    ///
+    /// let mut map: BTreeMap<i32, i32> = (0..8).map(|x| (x, x)).collect();
+    /// let low: BTreeMap<_, _> = map.extract_if(0..4, |_k, _v| true).collect();
+    /// let high = map;
+    /// assert_eq!(low.keys().copied().collect::<Vec<_>>(), [0, 1, 2, 3]);
+    /// assert_eq!(high.keys().copied().collect::<Vec<_>>(), [4, 5, 6, 7]);
     /// ```
     #[unstable(feature = "btree_extract_if", issue = "70530")]
-    pub fn extract_if<F>(&mut self, pred: F) -> ExtractIf<'_, K, V, F, A>
+    pub fn extract_if<F, R>(&mut self, range: R, pred: F) -> ExtractIf<'_, K, V, R, F, A>
     where
         K: Ord,
+        R: RangeBounds<K>,
         F: FnMut(&K, &mut V) -> bool,
     {
-        let (inner, alloc) = self.extract_if_inner();
+        let (inner, alloc) = self.extract_if_inner(range);
         ExtractIf { pred, inner, alloc }
     }
 
-    pub(super) fn extract_if_inner(&mut self) -> (ExtractIfInner<'_, K, V>, A)
+    pub(super) fn extract_if_inner<R>(&mut self, range: R) -> (ExtractIfInner<'_, K, V, R>, A)
     where
         K: Ord,
+        R: RangeBounds<K>,
     {
         if let Some(root) = self.root.as_mut() {
             let (root, dormant_root) = DormantMutRef::new(root);
-            let front = root.borrow_mut().first_leaf_edge();
+            let first = root.borrow_mut().lower_bound(SearchBound::from_range(range.start_bound()));
             (
                 ExtractIfInner {
                     length: &mut self.length,
                     dormant_root: Some(dormant_root),
-                    cur_leaf_edge: Some(front),
+                    cur_leaf_edge: Some(first),
+                    range,
                 },
                 (*self.alloc).clone(),
             )
@@ -1459,6 +1468,7 @@ impl<K, V, A: Allocator + Clone> BTreeMap<K, V, A> {
                     length: &mut self.length,
                     dormant_root: None,
                     cur_leaf_edge: None,
+                    range,
                 },
                 (*self.alloc).clone(),
             )
@@ -1917,18 +1927,19 @@ pub struct ExtractIf<
     'a,
     K,
     V,
+    R,
     F,
     #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator + Clone = Global,
 > {
     pred: F,
-    inner: ExtractIfInner<'a, K, V>,
+    inner: ExtractIfInner<'a, K, V, R>,
     /// The BTreeMap will outlive this IntoIter so we don't care about drop order for `alloc`.
     alloc: A,
 }
 
 /// Most of the implementation of ExtractIf are generic over the type
 /// of the predicate, thus also serving for BTreeSet::ExtractIf.
-pub(super) struct ExtractIfInner<'a, K, V> {
+pub(super) struct ExtractIfInner<'a, K, V, R> {
     /// Reference to the length field in the borrowed map, updated live.
     length: &'a mut usize,
     /// Buried reference to the root field in the borrowed map.
@@ -1938,10 +1949,13 @@ pub(super) struct ExtractIfInner<'a, K, V> {
     /// Empty if the map has no root, if iteration went beyond the last leaf edge,
     /// or if a panic occurred in the predicate.
     cur_leaf_edge: Option<Handle<NodeRef<marker::Mut<'a>, K, V, marker::Leaf>, marker::Edge>>,
+    /// Range over which iteration was requested.  We don't need the left side, but we
+    /// can't extract the right side without requiring K: Clone.
+    range: R,
 }
 
 #[unstable(feature = "btree_extract_if", issue = "70530")]
-impl<K, V, F, A> fmt::Debug for ExtractIf<'_, K, V, F, A>
+impl<K, V, R, F, A> fmt::Debug for ExtractIf<'_, K, V, R, F, A>
 where
     K: fmt::Debug,
     V: fmt::Debug,
@@ -1953,8 +1967,10 @@ where
 }
 
 #[unstable(feature = "btree_extract_if", issue = "70530")]
-impl<K, V, F, A: Allocator + Clone> Iterator for ExtractIf<'_, K, V, F, A>
+impl<K, V, R, F, A: Allocator + Clone> Iterator for ExtractIf<'_, K, V, R, F, A>
 where
+    K: PartialOrd,
+    R: RangeBounds<K>,
     F: FnMut(&K, &mut V) -> bool,
 {
     type Item = (K, V);
@@ -1968,7 +1984,7 @@ where
     }
 }
 
-impl<'a, K, V> ExtractIfInner<'a, K, V> {
+impl<'a, K, V, R> ExtractIfInner<'a, K, V, R> {
     /// Allow Debug implementations to predict the next element.
     pub(super) fn peek(&self) -> Option<(&K, &V)> {
         let edge = self.cur_leaf_edge.as_ref()?;
@@ -1978,10 +1994,22 @@ impl<'a, K, V> ExtractIfInner<'a, K, V> {
     /// Implementation of a typical `ExtractIf::next` method, given the predicate.
     pub(super) fn next<F, A: Allocator + Clone>(&mut self, pred: &mut F, alloc: A) -> Option<(K, V)>
     where
+        K: PartialOrd,
+        R: RangeBounds<K>,
         F: FnMut(&K, &mut V) -> bool,
     {
         while let Ok(mut kv) = self.cur_leaf_edge.take()?.next_kv() {
             let (k, v) = kv.kv_mut();
+
+            // On creation, we navigated directly to the left bound, so we need only check the
+            // right bound here to decide whether to stop.
+            match self.range.end_bound() {
+                Bound::Included(ref end) if (*k).le(end) => (),
+                Bound::Excluded(ref end) if (*k).lt(end) => (),
+                Bound::Unbounded => (),
+                _ => return None,
+            }
+
             if pred(k, v) {
                 *self.length -= 1;
                 let (kv, pos) = kv.remove_kv_tracking(
@@ -2013,7 +2041,13 @@ impl<'a, K, V> ExtractIfInner<'a, K, V> {
 }
 
 #[unstable(feature = "btree_extract_if", issue = "70530")]
-impl<K, V, F> FusedIterator for ExtractIf<'_, K, V, F> where F: FnMut(&K, &mut V) -> bool {}
+impl<K, V, R, F> FusedIterator for ExtractIf<'_, K, V, R, F>
+where
+    K: PartialOrd,
+    R: RangeBounds<K>,
+    F: FnMut(&K, &mut V) -> bool,
+{
+}
 
 #[stable(feature = "btree_range", since = "1.17.0")]
 impl<'a, K, V> Iterator for Range<'a, K, V> {