{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":".unwrap_or_else(||"}]}
                .unwrap_or_else(|| self.tcx.def_span(item_def_id)),
                .def_ident_span(item_def_id)
            opaque_type_span: self.tcx.def_span(self.def_id),