{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"first:"}]}
                    first: ctxt.rustc_main_fn.unwrap().1,
                    span: ctxt.tcx.def_span(id.owner_id.to_def_id()),
                    additional: ctxt.tcx.def_span(id.owner_id.to_def_id()),