error[E0597]: `pool` does not live long enough
  --> src/main.rs:22:63
   |
22 |                 let service = || service_fn(|req| router(req, pool.clone()));
   |                               -- -----------------------------^^^^----------
   |                               |  |                            |
   |                               |  |                            borrowed value does not live long enough
   |                               |  returning this value requires that `pool` is borrowed for `'static`
   |                               value captured here
...
30 |             })
   |             - `pool` dropped here while still borrowed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0597`.