{"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<RegionNameHighlight> {
        hir_ty: &hir::Ty<'_>,
        let search_stack: &mut Vec<(Ty<'tcx>, &hir::Ty<'_>)> = &mut vec![(ty, hir_ty)];