{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"hir::FnRetTy::DefaultReturn(_)"}]}
                    hir::FnRetTy::DefaultReturn(_) => {
                let (mut span, mut hir_ty) = match fn_decl.output {
                        (tcx.sess.source_map().end_point(fn_decl_span), None)