{"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
    let mut db = RootDatabase::new(lru_cap);
    let lru_cap = std::env::var("RA_LRU_CAP").ok().and_then(|it| it.parse::<u16>().ok());
    let mut analysis_change = ChangeWithProcMacros::default();