{"ast_node_type":"variable","tokens":[{"end":24,"kind":"keyword","start":0,"text":"let"}]}
        let Some(cnum) =
        let name = Symbol::intern(&tcx.sess.opts.unstable_opts.profiler_runtime);
            self.resolve_crate(tcx, name, DUMMY_SP, CrateDepKind::Implicit, CrateOrigin::Injected)