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-rw-r--r--compiler/rustc_errors/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_errors/src/lib.rs b/compiler/rustc_errors/src/lib.rs
index d2eb4f212eb..395bf5aad01 100644
--- a/compiler/rustc_errors/src/lib.rs
+++ b/compiler/rustc_errors/src/lib.rs
@@ -457,6 +457,7 @@ struct HandlerInner {
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
 pub enum StashKey {
     ItemNoType,
+    UnderscoreForArrayLengths,
 }
 
 fn default_track_diagnostic(_: &Diagnostic) {}