warning: useless use of `format!`
   --> src/service/server.rs:484:61
    |
484 |               return Err(ShadowsocksError::InsufficientParams(format!(
    |  _____________________________________________________________^
485 | |                 "missing proxy servers, consider specifying it by \
486 | |                     --server-addr, --encrypt-method, --password command line option, \
487 | |                         or configuration file, check more details in https://shadowsocks.org/doc/configs.html"
488 | |             )));
    | |_____________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
help: consider using `.to_string()`
    |
484 ~             return Err(ShadowsocksError::InsufficientParams("missing proxy servers, consider specifying it by \
485 +                     --server-addr, --encrypt-method, --password command line option, \
486 ~                         or configuration file, check more details in https://shadowsocks.org/doc/configs.html".to_string()));
    |

warning: useless use of `format!`
   --> src/service/manager.rs:460:50
    |
460 |               ShadowsocksError::InsufficientParams(format!(
    |  __________________________________________________^
461 | |                 "missing `manager_address`, consider specifying it by --manager-address command line option, \
462 | |                     or \"manager_address\" and \"manager_port\" keys in configuration file"
463 | |             ))
    | |_____________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
help: consider using `.to_string()`
    |
460 ~             ShadowsocksError::InsufficientParams("missing `manager_address`, consider specifying it by --manager-address command line option, \
461 ~                     or \"manager_address\" and \"manager_port\" keys in configuration file".to_string())
    |

warning: useless use of `format!`
   --> src/service/local.rs:942:61
    |
942 |               return Err(ShadowsocksError::InsufficientParams(format!(
    |  _____________________________________________________________^
943 | |                 "missing `local_address`, consider specifying it by --local-addr command line option, \
944 | |                     or \"local_address\" and \"local_port\" in configuration file"
945 | |             )));
    | |_____________^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
    = note: `#[warn(clippy::useless_format)]` on by default
help: consider using `.to_string()`
    |
942 ~             return Err(ShadowsocksError::InsufficientParams("missing `local_address`, consider specifying it by --local-addr command line option, \
943 ~                     or \"local_address\" and \"local_port\" in configuration file".to_string()));
    |

warning: this lifetime isn't used in the function definition
   --> crates/shadowsocks-service/src/local/tun/tcp.rs:568:37
    |
568 | async fn establish_client_tcp_redir<'a>(
    |                                     ^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes

warning: this lifetime isn't used in the function definition
  --> crates/shadowsocks-service/src/local/redir/tcprelay/mod.rs:35:37
   |
35 | async fn establish_client_tcp_redir<'a>(
   |                                     ^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
   = note: `#[warn(clippy::extra_unused_lifetimes)]` on by default