1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_arena/src/lib.rs b/crates/ra_arena/src/lib.rs
index 44d9e826b..a5eeb4118 100644
--- a/crates/ra_arena/src/lib.rs
+++ b/crates/ra_arena/src/lib.rs
@@ -33,7 +33,7 @@ impl fmt::Display for RawId {
     }
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Arena<ID: ArenaId, T> {
     data: Vec<T>,
     _ty: PhantomData<ID>,