From c3778fae6f57d30381476ea0110cb445e52b407a Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Mon, 15 Dec 2014 15:35:34 -0500
Subject: [PATCH] libstd: add a dummy field to `OsRng` to avoid out of module
 construction

---
 src/libstd/rand/os.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/libstd/rand/os.rs b/src/libstd/rand/os.rs
index c0eebe135c3c..c1e426602694 100644
--- a/src/libstd/rand/os.rs
+++ b/src/libstd/rand/os.rs
@@ -187,7 +187,10 @@ mod imp {
     /// - iOS: calls SecRandomCopyBytes as /dev/(u)random is sandboxed
     /// This does not block.
     #[allow(missing_copy_implementations)]
-    pub struct OsRng;
+    pub struct OsRng {
+        // dummy field to ensure that this struct cannot be constructed outside of this module
+        _dummy: (),
+    }
 
     #[repr(C)]
     struct SecRandom;
@@ -204,7 +207,7 @@ mod imp {
     impl OsRng {
         /// Create a new `OsRng`.
         pub fn new() -> IoResult<OsRng> {
-            Ok(OsRng)
+            Ok(OsRng { _dummy: () })
         }
     }