{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
    let is_lto = opt_stage == llvm::OptStage::ThinLTO || opt_stage == llvm::OptStage::FatLTO;
    let pgo_sample_use_path = get_pgo_sample_use_path(config);
    let instr_profile_output_path = get_instr_profile_output_path(config);