{"ast_node_type":"function","tokens":[{"end":45,"kind":"keyword","start":0,"text":"fn"}]}
        fn visit_ty(&mut self, t: Ty<'tcx>) {
    impl<'tcx, V: Copy> ty::TypeVisitor<TyCtxt<'tcx>> for InferVarCollector<'_, V> {
            if let Some(vid) = t.ty_vid() {