{"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
        let target_cpu = target_cpu(tcx.sess);
    fn codegen_crate(&self, tcx: TyCtxt<'_>) -> Box<dyn Any> {
        let res = codegen_crate(self.clone(), tcx, target_cpu.to_string());