Auto merge of #31069 - sfackler:file-try-clone, r=alexcrichton

I have it set as stable right now under the rationale that it's extending an existing, stable API to another type in the "obvious" way.

r? @alexcrichton

cc @reem

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libstd/sys/windows/fs.rs b/src/libstd/sys/windows/fs.rs
index a8b82ef5f29..e965a4a1d54 100644
--- a/src/libstd/sys/windows/fs.rs
+++ b/src/libstd/sys/windows/fs.rs
@@ -338,6 +338,12 @@ impl File {
         Ok(newpos as u64)
     }
 
+    pub fn duplicate(&self) -> io::Result<File> {
+        Ok(File {
+            handle: try!(self.handle.duplicate(0, true, c::DUPLICATE_SAME_ACCESS)),
+        })
+    }
+
     pub fn handle(&self) -> &Handle { &self.handle }
 
     pub fn into_handle(self) -> Handle { self.handle }