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-rw-r--r--compiler/rustc_middle/src/middle/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/middle/mod.rs b/compiler/rustc_middle/src/middle/mod.rs
index 4587dcaddc4..6ca1e620704 100644
--- a/compiler/rustc_middle/src/middle/mod.rs
+++ b/compiler/rustc_middle/src/middle/mod.rs
@@ -12,7 +12,7 @@ pub mod lib_features {
     #[derive(HashStable, TyEncodable, TyDecodable)]
     pub enum FeatureStability {
         AcceptedSince(Symbol),
-        Unstable,
+        Unstable { old_name: Option<Symbol> },
     }
 
     #[derive(HashStable, Debug, Default)]