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-rw-r--r--compiler/rustc_codegen_ssa/src/codegen_attrs.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
index d16d4ed2283..4b2fd61442b 100644
--- a/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
+++ b/compiler/rustc_codegen_ssa/src/codegen_attrs.rs
@@ -860,7 +860,7 @@ fn autodiff_attrs(tcx: TyCtxt<'_>, id: DefId) -> Option<AutoDiffAttrs> {
         }
     }
 
-    Some(AutoDiffAttrs { mode, ret_activity, input_activity: arg_activities })
+    Some(AutoDiffAttrs { mode, width: 1, ret_activity, input_activity: arg_activities })
 }
 
 pub(crate) fn provide(providers: &mut Providers) {