{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
        let typing_env = ty::TypingEnv::post_analysis(tcx, body.source.def_id());
        // to runtime, so we have to manually specify the correct typing mode.
        // For types that do not need dropping, the behaviour is trivial. So we only need to track