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-rw-r--r--src/libcollections/enum_set.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libcollections/enum_set.rs b/src/libcollections/enum_set.rs
index f33d77ba682..7fda99d8d2c 100644
--- a/src/libcollections/enum_set.rs
+++ b/src/libcollections/enum_set.rs
@@ -141,7 +141,7 @@ mod test {
 
     use enum_set::{EnumSet, CLike};
 
-    #[deriving(Eq)]
+    #[deriving(Eq, Show)]
     #[repr(uint)]
     enum Foo {
         A, B, C