diff --git a/compiler/rustc_macros/src/diagnostics/diagnostic.rs b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
index 8c5b64fab5f..d7daee64d79 100644
--- a/compiler/rustc_macros/src/diagnostics/diagnostic.rs
+++ b/compiler/rustc_macros/src/diagnostics/diagnostic.rs
@@ -354,7 +354,8 @@ impl SessionDiagnosticDeriveBuilder {
                 );
             }
         } else {
-            field.attrs
+            field
+                .attrs
                 .iter()
                 .map(move |attr| {
                     let name = attr.path.segments.last().unwrap().ident.to_string();