Auto merge of #62335 - Mark-Simulacrum:rollup-0pcaz5a, r=Mark-Simulacrum

Rollup of 15 pull requests

Successful merges:

 - #62021 (MSVC link output improve)
 - #62064 (nth_back for chunks_exact)
 - #62128 (Adjust warning of -C extra-filename with -o.)
 - #62161 (Add missing links for TryFrom docs)
 - #62183 (std: Move a process test out of libstd)
 - #62186 (Add missing type urls in Into trait)
 - #62196 (Add Vec::leak)
 - #62199 (import gdb for explicit access to gdb.current_objfile())
 - #62229 (Enable intptrcast for explicit casts)
 - #62250 (Improve box clone doctests to ensure the documentation is valid)
 - #62255 (Switch tracking issue for `#![feature(slice_patterns)]`)
 - #62285 (Fix michaelwoerister's mailmap)
 - #62304 (HashMap is UnwindSafe)
 - #62319 (Fix mismatching Kleene operators)
 - #62327 (Fixed document bug, those replaced each other)

Failed merges:

r? @ghost

2 files changed, 47 insertions, 1 deletions

diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index 9109a730cce..19b0f82db43 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -367,12 +367,19 @@ impl<T: Clone> Clone for Box<T> {
     /// ```
     /// let x = Box::new(5);
     /// let y = x.clone();
+    ///
+    /// // The value is the same
+    /// assert_eq!(x, y);
+    ///
+    /// // But they are unique objects
+    /// assert_ne!(&*x as *const i32, &*y as *const i32);
     /// ```
     #[rustfmt::skip]
     #[inline]
     fn clone(&self) -> Box<T> {
         box { (**self).clone() }
     }
+
     /// Copies `source`'s contents into `self` without creating a new allocation.
     ///
     /// # Examples
@@ -380,10 +387,15 @@ impl<T: Clone> Clone for Box<T> {
     /// ```
     /// let x = Box::new(5);
     /// let mut y = Box::new(10);
+    /// let yp: *const i32 = &*y;
     ///
     /// y.clone_from(&x);
     ///
-    /// assert_eq!(*y, 5);
+    /// // The value is the same
+    /// assert_eq!(x, y);
+    ///
+    /// // And no allocation occurred
+    /// assert_eq!(yp, &*y);
     /// ```
     #[inline]
     fn clone_from(&mut self, source: &Box<T>) {
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 92fe0834dd0..c0544d7469c 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -1367,6 +1367,40 @@ impl<T> Vec<T> {
             self.truncate(new_len);
         }
     }
+
+    /// Consumes and leaks the `Vec`, returning a mutable reference to the contents,
+    /// `&'a mut [T]`. Note that the type `T` must outlive the chosen lifetime
+    /// `'a`. If the type has only static references, or none at all, then this
+    /// may be chosen to be `'static`.
+    ///
+    /// This function is similar to the `leak` function on `Box`.
+    ///
+    /// This function is mainly useful for data that lives for the remainder of
+    /// the program's life. Dropping the returned reference will cause a memory
+    /// leak.
+    ///
+    /// # Examples
+    ///
+    /// Simple usage:
+    ///
+    /// ```
+    /// #![feature(vec_leak)]
+    ///
+    /// fn main() {
+    ///     let x = vec![1, 2, 3];
+    ///     let static_ref: &'static mut [usize] = Vec::leak(x);
+    ///     static_ref[0] += 1;
+    ///     assert_eq!(static_ref, &[2, 2, 3]);
+    /// }
+    /// ```
+    #[unstable(feature = "vec_leak", issue = "62195")]
+    #[inline]
+    pub fn leak<'a>(vec: Vec<T>) -> &'a mut [T]
+    where
+        T: 'a // Technically not needed, but kept to be explicit.
+    {
+        Box::leak(vec.into_boxed_slice())
+    }
 }
 
 impl<T: Clone> Vec<T> {