warning: field `conn` is never read
  --> src/redis/rwlock/lock.rs:78:16
   |
76 | pub struct RwLock<T> {
   |            ------ field in this struct
77 |     pub(crate) data: Generic<T>,
78 |     pub(crate) conn: Option<redis::Connection>,
   |                ^^^^
   |
   = note: `#[warn(dead_code)]` on by default