{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"self.psess.gated_spans.gate(sym::ergonomic_clones,"}]}
            self.psess.gated_spans.gate(sym::ergonomic_clones, use_span);
            let use_span = self.prev_token.span;
            return Ok(self.mk_use_expr(self_arg, lo));