Auto merge of rust-lang#127454 - matthiaskrgr:rollup-k3vfen2, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#127179 (Print `TypeId` as hex for debugging)
 - rust-lang#127189 (LinkedList's Cursor: method to get a ref to the cursor's list)
 - rust-lang#127236 (doc: update config file path in platform-support/wasm32-wasip1-threads.md)
 - rust-lang#127297 (Improve std::Path's Hash quality by avoiding prefix collisions)
 - rust-lang#127308 (Attribute cleanups)
 - rust-lang#127354 (Describe Sized requirements for mem::offset_of)
 - rust-lang#127409 (Emit a wrap expr span_bug only if context is not tainted)
 - rust-lang#127447 (once_lock: make test not take as long in Miri)

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

Author: bors

alloc/src/collections/linked_list.rs

@@ -1495,6 +1495,14 @@ impl<'a, T, A: Allocator> Cursor<'a, T, A> {
     pub fn back(&self) -> Option<&'a T> {
         self.list.back()
     }
+
+    /// Provides a reference to the cursor's parent list.
+    #[must_use]
+    #[inline(always)]
+    #[unstable(feature = "linked_list_cursors", issue = "58533")]
+    pub fn as_list(&self) -> &'a LinkedList<T, A> {
+        self.list
+    }
 }
 
 impl<'a, T, A: Allocator> CursorMut<'a, T, A> {
@@ -1605,6 +1613,18 @@ impl<'a, T, A: Allocator> CursorMut<'a, T, A> {
     pub fn as_cursor(&self) -> Cursor<'_, T, A> {
         Cursor { list: self.list, current: self.current, index: self.index }
     }
+
+    /// Provides a read-only reference to the cursor's parent list.
+    ///
+    /// The lifetime of the returned reference is bound to that of the
+    /// `CursorMut`, which means it cannot outlive the `CursorMut` and that the
+    /// `CursorMut` is frozen for the lifetime of the reference.
+    #[must_use]
+    #[inline(always)]
+    #[unstable(feature = "linked_list_cursors", issue = "58533")]
+    pub fn as_list(&self) -> &LinkedList<T, A> {
+        self.list
+    }
 }
 
 // Now the list editing operations

core/src/any.rs

@@ -673,7 +673,7 @@ impl hash::Hash for TypeId {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for TypeId {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
-        f.debug_tuple("TypeId").field(&self.as_u128()).finish()
+        write!(f, "TypeId({:#034x})", self.as_u128())
     }
 }
 

core/src/mem/mod.rs

@@ -1266,6 +1266,20 @@ impl<T> SizedTypeProperties for T {}
 /// // ^^^ error[E0616]: field `private` of struct `Struct` is private
 /// ```
 ///
+/// Only [`Sized`] fields are supported, but the container may be unsized:
+/// ```
+/// # use core::mem;
+/// #[repr(C)]
+/// pub struct Struct {
+///     a: u8,
+///     b: [u8],
+/// }
+///
+/// assert_eq!(mem::offset_of!(Struct, a), 0); // OK
+/// // assert_eq!(mem::offset_of!(Struct, b), 1);
+/// // ^^^ error[E0277]: doesn't have a size known at compile-time
+/// ```
+///
 /// Note that type layout is, in general, [subject to change and
 /// platform-specific](https://doc.rust-lang.org/reference/type-layout.html). If
 /// layout stability is required, consider using an [explicit `repr` attribute].

std/src/path.rs

@@ -3192,15 +3192,19 @@ impl Hash for Path {
         let bytes = &bytes[prefix_len..];
 
         let mut component_start = 0;
-        let mut bytes_hashed = 0;
+        // track some extra state to avoid prefix collisions.
+        // ["foo", "bar"] and ["foobar"], will have the same payload bytes
+        // but result in different chunk_bits
+        let mut chunk_bits: usize = 0;
 
         for i in 0..bytes.len() {
             let is_sep = if verbatim { is_verbatim_sep(bytes[i]) } else { is_sep_byte(bytes[i]) };
             if is_sep {
                 if i > component_start {
                     let to_hash = &bytes[component_start..i];
+                    chunk_bits = chunk_bits.wrapping_add(to_hash.len());
+                    chunk_bits = chunk_bits.rotate_right(2);
                     h.write(to_hash);
-                    bytes_hashed += to_hash.len();
                 }
 
                 // skip over separator and optionally a following CurDir item
@@ -3221,11 +3225,12 @@ impl Hash for Path {
 
         if component_start < bytes.len() {
             let to_hash = &bytes[component_start..];
+            chunk_bits = chunk_bits.wrapping_add(to_hash.len());
+            chunk_bits = chunk_bits.rotate_right(2);
             h.write(to_hash);
-            bytes_hashed += to_hash.len();
         }
 
-        h.write_usize(bytes_hashed);
+        h.write_usize(chunk_bits);
     }
 }
 

std/src/path/tests.rs

@@ -1619,6 +1619,20 @@ pub fn test_compare() {
     relative_from: Some("")
     );
 
+    tc!("foo//", "foo",
+    eq: true,
+    starts_with: true,
+    ends_with: true,
+    relative_from: Some("")
+    );
+
+    tc!("foo///", "foo",
+    eq: true,
+    starts_with: true,
+    ends_with: true,
+    relative_from: Some("")
+    );
+
     tc!("foo/.", "foo",
     eq: true,
     starts_with: true,
@@ -1633,13 +1647,34 @@ pub fn test_compare() {
     relative_from: Some("")
     );
 
+    tc!("foo/.//bar", "foo/bar",
+    eq: true,
+    starts_with: true,
+    ends_with: true,
+    relative_from: Some("")
+    );
+
+    tc!("foo//./bar", "foo/bar",
+    eq: true,
+    starts_with: true,
+    ends_with: true,
+    relative_from: Some("")
+    );
+
     tc!("foo/bar", "foo",
     eq: false,
     starts_with: true,
     ends_with: false,
     relative_from: Some("bar")
     );
 
+    tc!("foo/bar", "foobar",
+    eq: false,
+    starts_with: false,
+    ends_with: false,
+    relative_from: None
+    );
+
     tc!("foo/bar/baz", "foo/bar",
     eq: false,
     starts_with: true,

std/src/sync/once_lock.rs

@@ -80,14 +80,21 @@ use crate::sync::Once;
 /// static LIST: OnceList<u32> = OnceList::new();
 /// static COUNTER: AtomicU32 = AtomicU32::new(0);
 ///
-/// let vec = (0..thread::available_parallelism().unwrap().get()).map(|_| thread::spawn(|| {
-///     while let i @ 0..=1000 = COUNTER.fetch_add(1, Ordering::Relaxed) {
-///         LIST.push(i);
+/// # const LEN: u32 = if cfg!(miri) { 50 } else { 1000 };
+/// # /*
+/// const LEN: u32 = 1000;
+/// # */
+/// thread::scope(|s| {
+///     for _ in 0..thread::available_parallelism().unwrap().get() {
+///         s.spawn(|| {
+///             while let i @ 0..LEN = COUNTER.fetch_add(1, Ordering::Relaxed) {
+///                 LIST.push(i);
+///             }
+///         });
 ///     }
-/// })).collect::<Vec<thread::JoinHandle<_>>>();
-/// vec.into_iter().for_each(|handle| handle.join().unwrap());
+/// });
 ///
-/// for i in 0..=1000 {
+/// for i in 0..LEN {
 ///     assert!(LIST.contains(&i));
 /// }
 ///