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-rw-r--r--compiler/rustc_borrowck/src/dataflow.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_borrowck/src/dataflow.rs b/compiler/rustc_borrowck/src/dataflow.rs
index f825b1d8f70..6f533cec9fa 100644
--- a/compiler/rustc_borrowck/src/dataflow.rs
+++ b/compiler/rustc_borrowck/src/dataflow.rs
@@ -108,8 +108,8 @@ impl_visitable! {
 }
 
 rustc_index::newtype_index! {
+    #[debug_format = "bw{}"]
     pub struct BorrowIndex {
-        DEBUG_FORMAT = "bw{}"
     }
 }