1 files changed, 4 insertions, 0 deletions
diff --git a/src/librustc_driver/pretty.rs b/src/librustc_driver/pretty.rs
index b6441ab4944..d143d05acfe 100644
--- a/src/librustc_driver/pretty.rs
+++ b/src/librustc_driver/pretty.rs
@@ -49,12 +49,16 @@ pub enum PpSourceMode {
     PpmExpandedHygiene,
 }
 
+impl Copy for PpSourceMode {}
+
 #[deriving(PartialEq, Show)]
 pub enum PpMode {
     PpmSource(PpSourceMode),
     PpmFlowGraph,
 }
 
+impl Copy for PpMode {}
+
 pub fn parse_pretty(sess: &Session, name: &str) -> (PpMode, Option<UserIdentifiedItem>) {
     let mut split = name.splitn(1, '=');
     let first = split.next().unwrap();