1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/rustc_mir_transform/src/generator.rs b/compiler/rustc_mir_transform/src/generator.rs
index 669135f80bc..797a1a86846 100644
--- a/compiler/rustc_mir_transform/src/generator.rs
+++ b/compiler/rustc_mir_transform/src/generator.rs
@@ -856,7 +856,7 @@ fn sanitize_witness<'tcx>(
     tcx: TyCtxt<'tcx>,
     body: &Body<'tcx>,
     witness: Ty<'tcx>,
-    upvars: Vec<Ty<'tcx>>,
+    upvars: &'tcx ty::List<Ty<'tcx>>,
     layout: &GeneratorLayout<'tcx>,
 ) {
     let did = body.source.def_id();
@@ -1471,7 +1471,7 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
                 let args = args.as_generator();
                 (
                     args.discr_ty(tcx),
-                    args.upvar_tys().collect::<Vec<_>>(),
+                    args.upvar_tys(),
                     args.witness(),
                     movability == hir::Movability::Movable,
                 )