1 files changed, 3 insertions, 3 deletions
diff --git a/compiler/rustc_middle/src/ty/util.rs b/compiler/rustc_middle/src/ty/util.rs
index c32ba3edd5c..eb903ebfd99 100644
--- a/compiler/rustc_middle/src/ty/util.rs
+++ b/compiler/rustc_middle/src/ty/util.rs
@@ -668,10 +668,10 @@ impl<'tcx> TyCtxt<'tcx> {
         self,
         def_id: DefId,
     ) -> impl Iterator<Item = ty::EarlyBinder<Ty<'tcx>>> {
-        let generator_layout = &self.mir_generator_witnesses(def_id);
+        let generator_layout = self.mir_generator_witnesses(def_id);
         generator_layout
-            .field_tys
-            .iter()
+            .as_ref()
+            .map_or_else(|| [].iter(), |l| l.field_tys.iter())
             .filter(|decl| !decl.ignore_for_traits)
             .map(|decl| ty::EarlyBinder(decl.ty))
     }