warning: large size difference between variants
  --> crates/shadowsocks-service/src/server/tcprelay.rs:43:1
   |
43 | / enum RemoteStream {
44 | |     Direct(OutboundTcpStream),
   | |     ------------------------- the second-largest variant contains at least 48 bytes
45 | |     Proxied(OutboundProxyStream),
   | |     ---------------------------- the largest variant contains at least 1160 bytes
46 | | }
   | |_^ the entire enum is at least 1160 bytes
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#large_enum_variant
   = note: `#[warn(clippy::large_enum_variant)]` on by default
help: consider boxing the large fields or introducing indirection in some other way to reduce the total size of the enum
   |
45 -     Proxied(OutboundProxyStream),
45 +     Proxied(Box<OutboundProxyStream>),
   |

warning: this can be `std::io::Error::other(_)`
  --> crates/shadowsocks-service/src/local/fake_dns/udp_server.rs:80:32
   |
80 |                     return Err(io::Error::new(io::ErrorKind::Other, err));
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
   |
80 -                     return Err(io::Error::new(io::ErrorKind::Other, err));
80 +                     return Err(io::Error::other(err));
   |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/fake_dns/tcp_server.rs:151:28
    |
151 |                 return Err(io::Error::new(io::ErrorKind::Other, err));
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
151 -                 return Err(io::Error::new(io::ErrorKind::Other, err));
151 +                 return Err(io::Error::other(err));
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/fake_dns/tcp_server.rs:133:32
    |
133 |                     return Err(io::Error::new(io::ErrorKind::Other, err));
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
133 -                     return Err(io::Error::new(io::ErrorKind::Other, err));
133 +                     return Err(io::Error::other(err));
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:984:32
    |
984 |                 .map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
984 -                 .map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
984 +                 .map_err(|err| io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:975:50
    |
975 |                         next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
    |                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
975 -                         next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
975 +                         next.await.map_err(|err| io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:971:50
    |
971 |                         next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
    |                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
971 -                         next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
971 +                         next.await.map_err(|err| io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:922:61
    |
922 |                         Err(..) => next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
    |                                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
922 -                         Err(..) => next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
922 +                         Err(..) => next.await.map_err(|err| io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:918:61
    |
918 |                         Err(..) => next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
    |                                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
918 -                         Err(..) => next.await.map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
918 +                         Err(..) => next.await.map_err(|err| io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:886:36
    |
886 |                     .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
886 -                     .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
886 +                     .map_err(|err| io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:879:36
    |
879 |                     .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
879 -                     .map_err(|err| io::Error::new(io::ErrorKind::Other, err))
879 +                     .map_err(|err| io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:488:36
    |
488 |             Err(err) => return Err(io::Error::new(io::ErrorKind::Other, err)),
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
488 -             Err(err) => return Err(io::Error::new(io::ErrorKind::Other, err)),
488 +             Err(err) => return Err(io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:338:40
    |
338 |                 Err(err) => return Err(io::Error::new(io::ErrorKind::Other, err)),
    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
338 -                 Err(err) => return Err(io::Error::new(io::ErrorKind::Other, err)),
338 +                 Err(err) => return Err(io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:332:32
    |
332 |                     return Err(io::Error::new(io::ErrorKind::Other, err));
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
332 -                     return Err(io::Error::new(io::ErrorKind::Other, err));
332 +                     return Err(io::Error::other(err));
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/server.rs:324:32
    |
324 |                     return Err(io::Error::new(io::ErrorKind::Other, err));
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
324 -                     return Err(io::Error::new(io::ErrorKind::Other, err));
324 +                     return Err(io::Error::other(err));
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks-service/src/local/dns/dns_resolver.rs:101:32
    |
101 |                 .map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
101 -                 .map_err(|err| io::Error::new(io::ErrorKind::Other, err)),
101 +                 .map_err(|err| io::Error::other(err)),
    |

warning: this can be `std::io::Error::other(_)`
  --> crates/shadowsocks-service/src/local/dns/dns_resolver.rs:88:40
   |
88 | ...                   last_err = io::Error::new(io::ErrorKind::Other, err);
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
   |
88 -                             last_err = io::Error::new(io::ErrorKind::Other, err);
88 +                             last_err = io::Error::other(err);
   |

warning: this can be `std::io::Error::other(_)`
  --> crates/shadowsocks-service/src/local/dns/dns_resolver.rs:79:40
   |
79 | ...                   last_err = io::Error::new(io::ErrorKind::Other, err);
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
   = note: `#[warn(clippy::io_other_error)]` on by default
help: use `std::io::Error::other`
   |
79 -                             last_err = io::Error::new(io::ErrorKind::Other, err);
79 +                             last_err = io::Error::other(err);
   |

warning: this `if` can be collapsed into the outer `match`
    --> crates/shadowsocks-service/src/config.rs:1355:17
     |
1355 | /                 if !self.mode.enable_tcp() {
1356 | |                     let err = Error::new(ErrorKind::Invalid, "TCP mode have to be enabled for http", None);
1357 | |                     return Err(err);
1358 | |                 }
     | |_________________^
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#collapsible_match
     = note: `#[warn(clippy::collapsible_match)]` on by default
help: collapse nested if block
     |
1354 ~             ProtocolType::Http
1355 ~                 if !self.mode.enable_tcp() => {
1356 |                     let err = Error::new(ErrorKind::Invalid, "TCP mode have to be enabled for http", None);
1357 |                     return Err(err);
1358 ~                 }
     |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks/src/dns_resolver/hickory_dns_resolver.rs:195:25
    |
195 |                     Err(io::Error::new(io::ErrorKind::Other, err))
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
195 -                     Err(io::Error::new(io::ErrorKind::Other, err))
195 +                     Err(io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks/src/dns_resolver/hickory_dns_resolver.rs:189:33
    |
189 | ...                   Err(io::Error::new(io::ErrorKind::Other, err))
    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
help: use `std::io::Error::other`
    |
189 -                             Err(io::Error::new(io::ErrorKind::Other, err))
189 +                             Err(io::Error::other(err))
    |

warning: this can be `std::io::Error::other(_)`
   --> crates/shadowsocks/src/dns_resolver/hickory_dns_resolver.rs:164:25
    |
164 |                     Err(io::Error::new(io::ErrorKind::Other, err))
    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#io_other_error
    = note: `#[warn(clippy::io_other_error)]` on by default
help: use `std::io::Error::other`
    |
164 -                     Err(io::Error::new(io::ErrorKind::Other, err))
164 +                     Err(io::Error::other(err))
    |