Add some AsRef implementations for smart pointers

library/alloc/src/boxed.rs

@@ -2043,6 +2043,13 @@ impl<T: ?Sized, A: Allocator> AsRef<T> for Box<T, A> {
     }
 }
 
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl<A: Allocator> AsRef<[u8]> for Box<str, A> {
+    fn as_ref(&self) -> &[u8] {
+        (&**self).as_ref()
+    }
+}
+
 #[stable(since = "1.5.0", feature = "smart_ptr_as_ref")]
 impl<T: ?Sized, A: Allocator> AsMut<T> for Box<T, A> {
     fn as_mut(&mut self) -> &mut T {

library/alloc/src/rc.rs

@@ -3655,6 +3655,13 @@ impl<T: ?Sized, A: Allocator> AsRef<T> for Rc<T, A> {
     }
 }
 
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl<A: Allocator> AsRef<[u8]> for Rc<str, A> {
+    fn as_ref(&self) -> &[u8] {
+        (&**self).as_ref()
+    }
+}
+
 #[stable(feature = "pin", since = "1.33.0")]
 impl<T: ?Sized, A: Allocator> Unpin for Rc<T, A> {}
 

library/std/src/ffi/os_str.rs

@@ -1701,6 +1701,22 @@ impl AsRef<OsStr> for String {
     }
 }
 
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl AsRef<OsStr> for Box<str> {
+    #[inline]
+    fn as_ref(&self) -> &OsStr {
+        (&**self).as_ref()
+    }
+}
+
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl AsRef<OsStr> for Rc<str> {
+    #[inline]
+    fn as_ref(&self) -> &OsStr {
+        (&**self).as_ref()
+    }
+}
+
 impl FromInner<Buf> for OsString {
     #[inline]
     fn from_inner(buf: Buf) -> OsString {

library/std/src/path.rs

@@ -3358,6 +3358,22 @@ impl AsRef<Path> for PathBuf {
     }
 }
 
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl AsRef<Path> for Box<str> {
+    #[inline]
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
+#[stable(feature = "smart_ptr_as_ref_str", since = "CURRENT_RUSTC_VERSION")]
+impl AsRef<Path> for Rc<str> {
+    #[inline]
+    fn as_ref(&self) -> &Path {
+        Path::new(self)
+    }
+}
+
 #[stable(feature = "path_into_iter", since = "1.6.0")]
 impl<'a> IntoIterator for &'a PathBuf {
     type Item = &'a OsStr;