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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 466b9c7a3c2..a509c40c89c 100644
--- a/compiler/rustc_middle/src/mir/query.rs
+++ b/compiler/rustc_middle/src/mir/query.rs
@@ -17,7 +17,7 @@ use crate::ty::{self, CoroutineArgsExt, OpaqueHiddenType, Ty};
 rustc_index::newtype_index! {
     #[derive(HashStable)]
     #[encodable]
-    #[debug_format = "_{}"]
+    #[debug_format = "_s{}"]
     pub struct CoroutineSavedLocal {}
 }