2 files changed, 6 insertions, 6 deletions
diff --git a/src/libstd/sync/mpsc/mod.rs b/src/libstd/sync/mpsc/mod.rs
index cbda5afadcd..02a96b01cca 100644
--- a/src/libstd/sync/mpsc/mod.rs
+++ b/src/libstd/sync/mpsc/mod.rs
@@ -1638,7 +1638,7 @@ impl<T: Send> error::Error for SendError<T> {
         "sending on a closed channel"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -1681,7 +1681,7 @@ impl<T: Send> error::Error for TrySendError<T> {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -1709,7 +1709,7 @@ impl error::Error for RecvError {
         "receiving on a closed channel"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -1742,7 +1742,7 @@ impl error::Error for TryRecvError {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
@@ -1783,7 +1783,7 @@ impl error::Error for RecvTimeoutError {
         }
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         None
     }
 }
diff --git a/src/libstd/sync/mpsc/select.rs b/src/libstd/sync/mpsc/select.rs
index 9310dad9172..a7a284cfb79 100644
--- a/src/libstd/sync/mpsc/select.rs
+++ b/src/libstd/sync/mpsc/select.rs
@@ -93,7 +93,7 @@ pub struct Handle<'rx, T:Send+'rx> {
     next: *mut Handle<'static, ()>,
     prev: *mut Handle<'static, ()>,
     added: bool,
-    packet: &'rx (Packet+'rx),
+    packet: &'rx (dyn Packet+'rx),
 
     // due to our fun transmutes, we be sure to place this at the end. (nothing
     // previous relies on T)