Auto merge of #84241 - Dylan-DPC:rollup-jk9nt6k, r=Dylan-DPC

Rollup of 4 pull requests

Successful merges:

 - #83337 (rustdoc: Hide item contents, not items)
 - #83944 (Fix a couple resolve bugs from binder refactor)
 - #84145 (Address comments for vecdeque_binary_search #78021)
 - #84172 (Compiler error messages: reduce assertiveness of message E0384)

Failed merges:

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

compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs

@@ -1681,7 +1681,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 if decl.can_be_made_mutable() {
                     err.span_suggestion(
                         decl.source_info.span,
-                        "make this binding mutable",
+                        "consider making this binding mutable",
                         format!("mut {}", name),
                         Applicability::MachineApplicable,
                     );

compiler/rustc_resolve/src/late/lifetimes.rs

@@ -2719,6 +2719,13 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                 Some(next) => next,
                 None => break None,
             };
+            // See issue #83753. If someone writes an associated type on a non-trait, just treat it as
+            // there being no supertrait HRTBs.
+            match tcx.def_kind(def_id) {
+                DefKind::Trait | DefKind::TraitAlias | DefKind::Impl => {}
+                _ => break None,
+            }
+
             if trait_defines_associated_type_named(def_id) {
                 break Some(bound_vars.into_iter().collect());
             }
@@ -2764,7 +2771,14 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
                 | Scope::TraitRefBoundary { ref s, .. } => {
                     scope = *s;
                 }
-                Scope::Root => bug!("In fn_like_elision without appropriate scope above"),
+                Scope::Root => {
+                    // See issue #83907. Just bail out from looking inside.
+                    self.tcx.sess.delay_span_bug(
+                        rustc_span::DUMMY_SP,
+                        "In fn_like_elision without appropriate scope above",
+                    );
+                    return;
+                }
             }
         };
         // While not strictly necessary, we gather anon lifetimes *before* actually

library/alloc/src/collections/vec_deque/mod.rs

@@ -2403,6 +2403,12 @@ impl<T> VecDeque<T> {
     /// [`Result::Err`] is returned, containing the index where a matching
     /// element could be inserted while maintaining sorted order.
     ///
+    /// See also [`binary_search_by`], [`binary_search_by_key`], and [`partition_point`].
+    ///
+    /// [`binary_search_by`]: VecDeque::binary_search_by
+    /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
+    /// [`partition_point`]: VecDeque::partition_point
+    ///
     /// # Examples
     ///
     /// Looks up a series of four elements. The first is found, with a
@@ -2457,6 +2463,12 @@ impl<T> VecDeque<T> {
     /// [`Result::Err`] is returned, containing the index where a matching
     /// element could be inserted while maintaining sorted order.
     ///
+    /// See also [`binary_search`], [`binary_search_by_key`], and [`partition_point`].
+    ///
+    /// [`binary_search`]: VecDeque::binary_search
+    /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
+    /// [`partition_point`]: VecDeque::partition_point
+    ///
     /// # Examples
     ///
     /// Looks up a series of four elements. The first is found, with a
@@ -2481,8 +2493,11 @@ impl<T> VecDeque<T> {
         F: FnMut(&'a T) -> Ordering,
     {
         let (front, back) = self.as_slices();
+        let cmp_back = back.first().map(|elem| f(elem));
 
-        if let Some(Ordering::Less | Ordering::Equal) = back.first().map(|elem| f(elem)) {
+        if let Some(Ordering::Equal) = cmp_back {
+            Ok(front.len())
+        } else if let Some(Ordering::Less) = cmp_back {
             back.binary_search_by(f).map(|idx| idx + front.len()).map_err(|idx| idx + front.len())
         } else {
             front.binary_search_by(f)
@@ -2492,15 +2507,21 @@ impl<T> VecDeque<T> {
     /// Binary searches this sorted `VecDeque` with a key extraction function.
     ///
     /// Assumes that the `VecDeque` is sorted by the key, for instance with
-    /// [`make_contiguous().sort_by_key()`](#method.make_contiguous) using the same
-    /// key extraction function.
+    /// [`make_contiguous().sort_by_key()`] using the same key extraction function.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
     /// one of the matches could be returned. If the value is not found then
     /// [`Result::Err`] is returned, containing the index where a matching
     /// element could be inserted while maintaining sorted order.
     ///
+    /// See also [`binary_search`], [`binary_search_by`], and [`partition_point`].
+    ///
+    /// [`make_contiguous().sort_by_key()`]: VecDeque::make_contiguous
+    /// [`binary_search`]: VecDeque::binary_search
+    /// [`binary_search_by`]: VecDeque::binary_search_by
+    /// [`partition_point`]: VecDeque::partition_point
+    ///
     /// # Examples
     ///
     /// Looks up a series of four elements in a slice of pairs sorted by
@@ -2531,6 +2552,51 @@ impl<T> VecDeque<T> {
     {
         self.binary_search_by(|k| f(k).cmp(b))
     }
+
+    /// Returns the index of the partition point according to the given predicate
+    /// (the index of the first element of the second partition).
+    ///
+    /// The deque is assumed to be partitioned according to the given predicate.
+    /// This means that all elements for which the predicate returns true are at the start of the deque
+    /// and all elements for which the predicate returns false are at the end.
+    /// For example, [7, 15, 3, 5, 4, 12, 6] is a partitioned under the predicate x % 2 != 0
+    /// (all odd numbers are at the start, all even at the end).
+    ///
+    /// If this deque is not partitioned, the returned result is unspecified and meaningless,
+    /// as this method performs a kind of binary search.
+    ///
+    /// See also [`binary_search`], [`binary_search_by`], and [`binary_search_by_key`].
+    ///
+    /// [`binary_search`]: VecDeque::binary_search
+    /// [`binary_search_by`]: VecDeque::binary_search_by
+    /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(vecdeque_binary_search)]
+    /// use std::collections::VecDeque;
+    ///
+    /// let deque: VecDeque<_> = vec![1, 2, 3, 3, 5, 6, 7].into();
+    /// let i = deque.partition_point(|&x| x < 5);
+    ///
+    /// assert_eq!(i, 4);
+    /// assert!(deque.iter().take(i).all(|&x| x < 5));
+    /// assert!(deque.iter().skip(i).all(|&x| !(x < 5)));
+    /// ```
+    #[unstable(feature = "vecdeque_binary_search", issue = "78021")]
+    pub fn partition_point<P>(&self, mut pred: P) -> usize
+    where
+        P: FnMut(&T) -> bool,
+    {
+        let (front, back) = self.as_slices();
+
+        if let Some(true) = back.first().map(|v| pred(v)) {
+            back.partition_point(pred) + front.len()
+        } else {
+            front.partition_point(pred)
+        }
+    }
 }
 
 impl<T: Clone> VecDeque<T> {

library/alloc/tests/vec_deque.rs

@@ -1699,6 +1699,24 @@ fn test_binary_search_by_key() {
     assert_eq!(deque.binary_search_by_key(&4, |&(v,)| v), Err(3));
 }
 
+#[test]
+fn test_partition_point() {
+    // Contiguous (front only) search:
+    let deque: VecDeque<_> = vec![1, 2, 3, 5, 6].into();
+    assert!(deque.as_slices().1.is_empty());
+    assert_eq!(deque.partition_point(|&v| v <= 3), 3);
+
+    // Split search (both front & back non-empty):
+    let mut deque: VecDeque<_> = vec![5, 6].into();
+    deque.push_front(3);
+    deque.push_front(2);
+    deque.push_front(1);
+    deque.push_back(10);
+    assert!(!deque.as_slices().0.is_empty());
+    assert!(!deque.as_slices().1.is_empty());
+    assert_eq!(deque.partition_point(|&v| v <= 5), 4);
+}
+
 #[test]
 fn test_zero_sized_push() {
     const N: usize = 8;

src/librustdoc/html/render/mod.rs

@@ -43,7 +43,6 @@ use std::path::PathBuf;
 use std::str;
 use std::string::ToString;
 
-use itertools::Itertools;
 use rustc_ast_pretty::pprust;
 use rustc_attr::{Deprecation, StabilityLevel};
 use rustc_data_structures::fx::FxHashSet;
@@ -486,18 +485,7 @@ fn settings(root_path: &str, suffix: &str, themes: &[StylePath]) -> Result<Strin
             ],
         )
             .into(),
-        (
-            "Auto-hide item declarations",
-            vec![
-                ("auto-hide-struct", "Auto-hide structs declaration", true),
-                ("auto-hide-enum", "Auto-hide enums declaration", false),
-                ("auto-hide-union", "Auto-hide unions declaration", true),
-                ("auto-hide-trait", "Auto-hide traits declaration", true),
-                ("auto-hide-macro", "Auto-hide macros declaration", false),
-            ],
-        )
-            .into(),
-        ("auto-hide-attributes", "Auto-hide item attributes.", true).into(),
+        ("auto-hide-large-items", "Auto-hide item contents for large items.", true).into(),
         ("auto-hide-method-docs", "Auto-hide item methods' documentation", false).into(),
         ("auto-hide-trait-implementations", "Auto-hide trait implementation documentation", true)
             .into(),
@@ -947,19 +935,21 @@ fn render_assoc_item(
             + name.as_str().len()
             + generics_len;
 
-        let (indent, end_newline) = if parent == ItemType::Trait {
+        let (indent, indent_str, end_newline) = if parent == ItemType::Trait {
             header_len += 4;
-            (4, false)
+            let indent_str = "    ";
+            render_attributes_in_pre(w, meth, indent_str);
+            (4, indent_str, false)
         } else {
-            (0, true)
+            render_attributes_in_code(w, meth);
+            (0, "", true)
         };
-        render_attributes(w, meth, false);
         w.reserve(header_len + "<a href=\"\" class=\"fnname\">{".len() + "</a>".len());
         write!(
             w,
             "{}{}{}{}{}{}{}fn <a href=\"{href}\" class=\"fnname\">{name}</a>\
              {generics}{decl}{notable_traits}{where_clause}",
-            if parent == ItemType::Trait { "    " } else { "" },
+            indent_str,
             vis,
             constness,
             asyncness,
@@ -1015,35 +1005,33 @@ const ALLOWED_ATTRIBUTES: &[Symbol] = &[
     sym::non_exhaustive,
 ];
 
-// The `top` parameter is used when generating the item declaration to ensure it doesn't have a
-// left padding. For example:
-//
-// #[foo] <----- "top" attribute
-// struct Foo {
-//     #[bar] <---- not "top" attribute
-//     bar: usize,
-// }
-fn render_attributes(w: &mut Buffer, it: &clean::Item, top: bool) {
-    let attrs = it
-        .attrs
+fn attributes(it: &clean::Item) -> Vec<String> {
+    it.attrs
         .other_attrs
         .iter()
         .filter_map(|attr| {
             if ALLOWED_ATTRIBUTES.contains(&attr.name_or_empty()) {
-                Some(pprust::attribute_to_string(&attr))
+                Some(pprust::attribute_to_string(&attr).replace("\n", "").replace("  ", " "))
             } else {
                 None
             }
         })
-        .join("\n");
+        .collect()
+}
 
-    if !attrs.is_empty() {
-        write!(
-            w,
-            "<span class=\"docblock attributes{}\">{}</span>",
-            if top { " top-attr" } else { "" },
-            &attrs
-        );
+// When an attribute is rendered inside a `<pre>` tag, it is formatted using
+// a whitespace prefix and newline.
+fn render_attributes_in_pre(w: &mut Buffer, it: &clean::Item, prefix: &str) {
+    for a in attributes(it) {
+        write!(w, "{}{}\n", prefix, a);
+    }
+}
+
+// When an attribute is rendered inside a <code> tag, it is formatted using
+// a div to produce a newline after it.
+fn render_attributes_in_code(w: &mut Buffer, it: &clean::Item) {
+    for a in attributes(it) {
+        write!(w, "<div class=\"code-attribute\">{}</div>", a);
     }
 }