{"ast_node_type":"variable","tokens":[{"end":72,"kind":"keyword","start":0,"text":"let"}]}
        let can_const_prop = CanConstProp::check(tcx, typing_env, body);
        let typing_env = ty::TypingEnv::post_analysis(tcx, body.source.def_id());
        let ecx = InterpCx::new(tcx, tcx.def_span(def_id), typing_env, DummyMachine);