Rollup merge of #41390 - scottmcm:toowned-clone-into, r=alexcrichton

Override ToOwned::clone_into for Path and OsStr

The only non-overridden one remaining is the CStr impl, which cannot
be optimized as doing so would break CString's second invariant.

Follow-up to 7ec27ae (PR #41009).

r? @alexcrichton

src/libstd/path.rs

@@ -1414,6 +1414,9 @@ impl ToOwned for Path {
     fn to_owned(&self) -> PathBuf {
         self.to_path_buf()
     }
+    fn clone_into(&self, target: &mut PathBuf) {
+        self.inner.clone_into(&mut target.inner);
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -3859,4 +3862,13 @@ mod tests {
         assert_eq!(&*boxed, &*path_buf);
         assert_eq!(&*path_buf, path);
     }
+
+    #[test]
+    fn test_clone_into() {
+        let mut path_buf = PathBuf::from("supercalifragilisticexpialidocious");
+        let path = Path::new("short");
+        path.clone_into(&mut path_buf);
+        assert_eq!(path, path_buf);
+        assert!(path_buf.into_os_string().capacity() >= 15);
+    }
 }