1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
index 847c356b83c..e9d3d44a3f9 100644
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -39,9 +39,9 @@ struct LintLevelSets {
 }
 
 rustc_index::newtype_index! {
+    #[custom_encodable] // we don't need encoding
     struct LintStackIndex {
-        ENCODABLE = custom, // we don't need encoding
-        const COMMAND_LINE = 0,
+        const COMMAND_LINE = 0;
     }
 }