Return OutOfMemoryError and update docs

Author: ChrisDenton

library/std/src/fs.rs

@@ -2446,7 +2446,7 @@ pub fn symlink_metadata<P: AsRef<Path>>(path: P) -> io::Result<Metadata> {
 /// # Platform-specific behavior
 ///
 /// This function currently corresponds to the `rename` function on Unix
-/// and the `SetFileInformationByHandle` function on Windows.
+/// and the `MoveFileExW` or `SetFileInformationByHandle` function on Windows.
 ///
 /// Because of this, the behavior when both `from` and `to` exist differs. On
 /// Unix, if `from` is a directory, `to` must also be an (empty) directory. If

library/std/src/sys/pal/windows/fs.rs

@@ -1284,7 +1284,7 @@ pub fn rename(old: &Path, new: &Path) -> io::Result<()> {
             unsafe {
                 file_rename_info = alloc(layout).cast::<c::FILE_RENAME_INFO>();
                 if file_rename_info.is_null() {
-                    handle_alloc_error(layout);
+                    return Err(io::ErrorKind::OutOfMemory.into());
                 }
 
                 (&raw mut (*file_rename_info).Anonymous).write(c::FILE_RENAME_INFO_0 {