Update for rust beta

1 files changed, 2 insertions, 2 deletions

diff --git a/src/channel.rs b/src/channel.rs
index 73d7d9c..40933a1 100644
--- a/src/channel.rs
+++ b/src/channel.rs
@@ -40,7 +40,7 @@ pub struct ExitSignal {
 }
 
 /// Description of the read window as returned by `Channel::read_window`
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub struct ReadWindow {
     /// The number of bytes which the remote end may send without overflowing
     /// the window limit.
@@ -52,7 +52,7 @@ pub struct ReadWindow {
 }
 
 /// Description of the write window as returned by `Channel::write_window`
-#[derive(Copy)]
+#[derive(Copy, Clone)]
 pub struct WriteWindow {
     /// The number of bytes which may be safely written on the channel without
     /// blocking.