1 files changed, 17 insertions, 3 deletions
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index 6c957c2fa90..73b5056e932 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -1748,6 +1748,14 @@ impl ops::Deref for PathBuf {
     }
 }
 
+#[stable(feature = "path_buf_deref_mut", since = "CURRENT_RUSTC_VERSION")]
+impl ops::DerefMut for PathBuf {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Path {
+        Path::from_inner_mut(&mut self.inner)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Borrow<Path> for PathBuf {
     #[inline]
@@ -2000,6 +2008,12 @@ impl Path {
         unsafe { &*(s.as_ref() as *const OsStr as *const Path) }
     }
 
+    fn from_inner_mut(inner: &mut OsStr) -> &mut Path {
+        // SAFETY: Path is just a wrapper around OsStr,
+        // therefore converting &mut OsStr to &mut Path is safe.
+        unsafe { &mut *(inner as *mut OsStr as *mut Path) }
+    }
+
     /// Yields the underlying [`OsStr`] slice.
     ///
     /// # Examples
@@ -2025,12 +2039,12 @@ impl Path {
     /// #![feature(path_as_mut_os_str)]
     /// use std::path::{Path, PathBuf};
     ///
-    /// let mut path = PathBuf::from("/Foo.TXT").into_boxed_path();
+    /// let mut path = PathBuf::from("Foo.TXT");
     ///
-    /// assert_ne!(&*path, Path::new("/foo.txt"));
+    /// assert_ne!(path, Path::new("foo.txt"));
     ///
     /// path.as_mut_os_str().make_ascii_lowercase();
-    /// assert_eq!(&*path, Path::new("/foo.txt"));
+    /// assert_eq!(path, Path::new("foo.txt"));
     /// ```
     #[unstable(feature = "path_as_mut_os_str", issue = "105021")]
     #[must_use]