Auto merge of #77436 - JohnTitor:rollup-65dh7rp, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - #76851 (Fix 'FIXME' about using NonZeroU32 instead of u32.)
 - #76979 (Improve std::sys::windows::compat)
 - #77111 (Stabilize slice_ptr_range.)
 - #77147 (Split sys_common::Mutex in StaticMutex and MovableMutex.)
 - #77312 (Remove outdated line from `publish_toolstate` hook)
 - #77362 (Fix is_absolute on WASI)
 - #77375 (rustc_metadata: Do not forget to encode inherent impls for foreign types)
 - #77385 (Improve the example for ptr::copy)
 - #77389 (Fix some clippy lints)
 - #77399 (BTreeMap: use Unique::from to avoid a cast where type information exists)
 - #77429 (Link `new` method in `DefautHasher`s doc)

Failed merges:

r? `@ghost`

Author: bors

compiler/rustc_feature/src/accepted.rs

@@ -1,6 +1,6 @@
 //! List of the accepted feature gates.
 
-use super::{Feature, State};
+use super::{to_nonzero, Feature, State};
 use rustc_span::symbol::sym;
 
 macro_rules! declare_features {
@@ -14,7 +14,7 @@ macro_rules! declare_features {
                     state: State::Accepted,
                     name: sym::$feature,
                     since: $ver,
-                    issue: $issue,
+                    issue: to_nonzero($issue),
                     edition: None,
                     description: concat!($($doc,)*),
                 }

compiler/rustc_feature/src/active.rs

@@ -1,6 +1,6 @@
 //! List of the active feature gates.
 
-use super::{Feature, State};
+use super::{to_nonzero, Feature, State};
 
 use rustc_span::edition::Edition;
 use rustc_span::symbol::{sym, Symbol};
@@ -29,7 +29,7 @@ macro_rules! declare_features {
                     state: State::Active { set: set!($feature) },
                     name: sym::$feature,
                     since: $ver,
-                    issue: $issue,
+                    issue: to_nonzero($issue),
                     edition: $edition,
                     description: concat!($($doc,)*),
                 }

compiler/rustc_feature/src/lib.rs

@@ -46,17 +46,11 @@ pub struct Feature {
     pub state: State,
     pub name: Symbol,
     pub since: &'static str,
-    issue: Option<u32>, // FIXME: once #58732 is done make this an Option<NonZeroU32>
+    issue: Option<NonZeroU32>,
     pub edition: Option<Edition>,
     description: &'static str,
 }
 
-impl Feature {
-    fn issue(&self) -> Option<NonZeroU32> {
-        self.issue.and_then(NonZeroU32::new)
-    }
-}
-
 #[derive(Copy, Clone, Debug)]
 pub enum Stability {
     Unstable,
@@ -102,8 +96,8 @@ impl UnstableFeatures {
 fn find_lang_feature_issue(feature: Symbol) -> Option<NonZeroU32> {
     if let Some(info) = ACTIVE_FEATURES.iter().find(|t| t.name == feature) {
         // FIXME (#28244): enforce that active features have issue numbers
-        // assert!(info.issue().is_some())
-        info.issue()
+        // assert!(info.issue.is_some())
+        info.issue
     } else {
         // search in Accepted, Removed, or Stable Removed features
         let found = ACCEPTED_FEATURES
@@ -112,12 +106,21 @@ fn find_lang_feature_issue(feature: Symbol) -> Option<NonZeroU32> {
             .chain(STABLE_REMOVED_FEATURES)
             .find(|t| t.name == feature);
         match found {
-            Some(found) => found.issue(),
+            Some(found) => found.issue,
             None => panic!("feature `{}` is not declared anywhere", feature),
         }
     }
 }
 
+const fn to_nonzero(n: Option<u32>) -> Option<NonZeroU32> {
+    // Can be replaced with `n.and_then(NonZeroU32::new)` if that is ever usable
+    // in const context. Requires https://github.com/rust-lang/rfcs/pull/2632.
+    match n {
+        None => None,
+        Some(n) => NonZeroU32::new(n),
+    }
+}
+
 pub enum GateIssue {
     Language,
     Library(Option<NonZeroU32>),

compiler/rustc_feature/src/removed.rs

@@ -1,6 +1,6 @@
 //! List of the removed feature gates.
 
-use super::{Feature, State};
+use super::{to_nonzero, Feature, State};
 use rustc_span::symbol::sym;
 
 macro_rules! declare_features {
@@ -14,7 +14,7 @@ macro_rules! declare_features {
                     state: State::Removed { reason: $reason },
                     name: sym::$feature,
                     since: $ver,
-                    issue: $issue,
+                    issue: to_nonzero($issue),
                     edition: None,
                     description: concat!($($doc,)*),
                 }
@@ -32,7 +32,7 @@ macro_rules! declare_features {
                     state: State::Stabilized { reason: None },
                     name: sym::$feature,
                     since: $ver,
-                    issue: $issue,
+                    issue: to_nonzero($issue),
                     edition: None,
                     description: concat!($($doc,)*),
                 }

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1753,6 +1753,7 @@ impl EncodeContext<'a, 'tcx> {
         self.encode_const_stability(def_id);
         self.encode_deprecation(def_id);
         self.encode_item_type(def_id);
+        self.encode_inherent_implementations(def_id);
         if let hir::ForeignItemKind::Fn(..) = nitem.kind {
             record!(self.tables.fn_sig[def_id] <- tcx.fn_sig(def_id));
             self.encode_variances_of(def_id);

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

@@ -128,7 +128,7 @@ impl<K, V> BoxedNode<K, V> {
     }
 
     fn from_internal(node: Box<InternalNode<K, V>>) -> Self {
-        BoxedNode { ptr: Box::into_unique(node).cast() }
+        BoxedNode { ptr: Unique::from(&mut Box::leak(node).data) }
     }
 
     unsafe fn from_ptr(ptr: NonNull<LeafNode<K, V>>) -> Self {

library/core/src/intrinsics.rs

@@ -1901,11 +1901,21 @@ pub unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize) {
 /// ```
 /// use std::ptr;
 ///
+/// /// # Safety:
+/// /// * `ptr` must be correctly aligned for its type and non-zero.
+/// /// * `ptr` must be valid for reads of `elts` contiguous objects of type `T`.
+/// /// * Those elements must not be used after calling this function unless `T: Copy`.
 /// # #[allow(dead_code)]
 /// unsafe fn from_buf_raw<T>(ptr: *const T, elts: usize) -> Vec<T> {
 ///     let mut dst = Vec::with_capacity(elts);
-///     dst.set_len(elts);
+///
+///     // SAFETY: Our precondition ensures the source is aligned and valid,
+///     // and `Vec::with_capacity` ensures that we have usable space to write them.
 ///     ptr::copy(ptr, dst.as_mut_ptr(), elts);
+///
+///     // SAFETY: We created it with this much capacity earlier,
+///     // and the previous `copy` has initialized these elements.
+///     dst.set_len(elts);
 ///     dst
 /// }
 /// ```

library/core/src/slice/mod.rs

@@ -458,8 +458,6 @@ impl<T> [T] {
     /// element of this slice:
     ///
     /// ```
-    /// #![feature(slice_ptr_range)]
-    ///
     /// let a = [1, 2, 3];
     /// let x = &a[1] as *const _;
     /// let y = &5 as *const _;
@@ -469,7 +467,7 @@ impl<T> [T] {
     /// ```
     ///
     /// [`as_ptr`]: #method.as_ptr
-    #[unstable(feature = "slice_ptr_range", issue = "65807")]
+    #[stable(feature = "slice_ptr_range", since = "1.48.0")]
     #[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
     #[inline]
     pub const fn as_ptr_range(&self) -> Range<*const T> {
@@ -511,7 +509,7 @@ impl<T> [T] {
     /// common in C++.
     ///
     /// [`as_mut_ptr`]: #method.as_mut_ptr
-    #[unstable(feature = "slice_ptr_range", issue = "65807")]
+    #[stable(feature = "slice_ptr_range", since = "1.48.0")]
     #[rustc_const_unstable(feature = "const_ptr_offset", issue = "71499")]
     #[inline]
     pub const fn as_mut_ptr_range(&mut self) -> Range<*mut T> {

library/std/src/collections/hash/map.rs

@@ -2836,11 +2836,10 @@ impl DefaultHasher {
 
 #[stable(feature = "hashmap_default_hasher", since = "1.13.0")]
 impl Default for DefaultHasher {
-    // FIXME: here should link `new` to [DefaultHasher::new], but it occurs intra-doc link
-    // resolution failure when re-exporting libstd items. When #56922 fixed,
-    // link `new` to [DefaultHasher::new] again.
-    /// Creates a new `DefaultHasher` using `new`.
+    /// Creates a new `DefaultHasher` using [`new`].
     /// See its documentation for more.
+    ///
+    /// [`new`]: DefaultHasher::new
     fn default() -> DefaultHasher {
         DefaultHasher::new()
     }

library/std/src/path.rs

@@ -1838,7 +1838,7 @@ impl Path {
             // FIXME: Allow Redox prefixes
             self.has_root() || has_redox_scheme(self.as_u8_slice())
         } else {
-            self.has_root() && (cfg!(unix) || self.prefix().is_some())
+            self.has_root() && (cfg!(any(unix, target_os = "wasi")) || self.prefix().is_some())
         }
     }