fix build

diff --git a/src/libstd/sys/windows/mutex.rs b/src/libstd/sys/windows/mutex.rs
index 3ba19a40d48b95311eb675ec64c1494eca68fea2..a8eb82a8a6649179ce4bdd42f72ae92a9c2b4f9b 100644 (file)
--- a/src/libstd/sys/windows/mutex.rs
+++ b/src/libstd/sys/windows/mutex.rs
@@ -164,7 +164,7 @@ unsafe impl Sync for ReentrantMutex {}
 
 impl ReentrantMutex {
     pub fn uninitialized() -> ReentrantMutex {
-        MaybeUninit::uninitialized()
+        ReentrantMutex { inner: MaybeUninit::uninitialized() }
     }
 
     pub unsafe fn init(&mut self) {