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-rw-r--r--compiler/rustc_middle/src/mir/query.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/mir/query.rs b/compiler/rustc_middle/src/mir/query.rs
index 4db3ded34ea..160e9691e69 100644
--- a/compiler/rustc_middle/src/mir/query.rs
+++ b/compiler/rustc_middle/src/mir/query.rs
@@ -131,8 +131,8 @@ pub struct UnsafetyCheckResult {
 
 rustc_index::newtype_index! {
     #[derive(HashStable)]
+    #[debug_format = "_{}"]
     pub struct GeneratorSavedLocal {
-        DEBUG_FORMAT = "_{}",
     }
 }