{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"callee_span:"}]}
            callee_span: tcx.def_span(callsite.callee.def_id()),
            caller: tcx.def_path_str(self.def_id),
            callee: tcx.def_path_str(callsite.callee.def_id()),