Override clone_from method for PathBuf and OsString

library/std/src/ffi/os_str.rs

@@ -71,7 +71,6 @@ use crate::sys_common::{AsInner, FromInner, IntoInner};
 /// [`&str`]: str
 /// [`CStr`]: crate::ffi::CStr
 /// [conversions]: super#conversions
-#[derive(Clone)]
 #[cfg_attr(not(test), rustc_diagnostic_item = "OsString")]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct OsString {
@@ -420,6 +419,19 @@ impl Default for OsString {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Clone for OsString {
+    #[inline]
+    fn clone(&self) -> Self {
+        OsString { inner: self.inner.clone() }
+    }
+
+    #[inline]
+    fn clone_from(&mut self, source: &Self) {
+        self.inner.clone_from(&source.inner)
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for OsString {
     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {

library/std/src/path.rs

@@ -1065,7 +1065,6 @@ impl FusedIterator for Ancestors<'_> {}
 /// ```
 ///
 /// Which method works best depends on what kind of situation you're in.
-#[derive(Clone)]
 #[cfg_attr(not(test), rustc_diagnostic_item = "PathBuf")]
 #[stable(feature = "rust1", since = "1.0.0")]
 // FIXME:
@@ -1406,6 +1405,19 @@ impl PathBuf {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Clone for PathBuf {
+    #[inline]
+    fn clone(&self) -> Self {
+        PathBuf { inner: self.inner.clone() }
+    }
+
+    #[inline]
+    fn clone_from(&mut self, source: &Self) {
+        self.inner.clone_from(&source.inner)
+    }
+}
+
 #[stable(feature = "box_from_path", since = "1.17.0")]
 impl From<&Path> for Box<Path> {
     fn from(path: &Path) -> Box<Path> {

library/std/src/sys_common/os_str_bytes.rs

@@ -14,7 +14,7 @@ use crate::sys_common::{AsInner, FromInner, IntoInner};
 
 use core::str::lossy::Utf8Lossy;
 
-#[derive(Clone, Hash)]
+#[derive(Hash)]
 pub(crate) struct Buf {
     pub inner: Vec<u8>,
 }
@@ -53,6 +53,18 @@ impl fmt::Display for Buf {
     }
 }
 
+impl Clone for Buf {
+    #[inline]
+    fn clone(&self) -> Self {
+        Buf { inner: self.inner.clone() }
+    }
+
+    #[inline]
+    fn clone_from(&mut self, source: &Self) {
+        self.inner.clone_from(&source.inner)
+    }
+}
+
 impl IntoInner<Vec<u8>> for Buf {
     fn into_inner(self) -> Vec<u8> {
         self.inner