1 files changed, 8 insertions, 1 deletions
diff --git a/src/libstd/comm.rs b/src/libstd/comm.rs
index 3118a0c1ba5..16e8b63da81 100644
--- a/src/libstd/comm.rs
+++ b/src/libstd/comm.rs
@@ -23,7 +23,14 @@ use core::pipes;
 use core::prelude::*;
 
 /// An extension of `pipes::stream` that allows both sending and receiving.
-pub struct DuplexStream<T: Owned, U: Owned> {
+#[cfg(stage0)]
+pub struct DuplexStream<T:Owned, U:Owned> {
+    priv chan: Chan<T>,
+    priv port: Port<U>,
+}
+#[cfg(stage1)]
+#[cfg(stage2)]
+pub struct DuplexStream<T, U> {
     priv chan: Chan<T>,
     priv port: Port<U>,
 }