warning: the borrowed expression implements the required traits --> crates/shadowsocks/src/config.rs:636:55 | 636 | URL_PASSWORD_BASE64_ENGINE.encode(&user_info) | ^^^^^^^^^^ help: change this to: `user_info` | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrows_for_generic_args = note: `#[warn(clippy::needless_borrows_for_generic_args)]` on by default

warning: this argument is a mutable reference, but not used mutably --> crates/shadowsocks-service/src/local/dns/upstream.rs:161:62 | 161 | fn check_peekable<F: std::os::unix::io::AsRawFd>(fd: &mut F) -> bool { | ^^^^^^ help: consider changing to: `&F` | = note: this is cfg-gated and may require further changes = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_pass_by_ref_mut = note: `#[warn(clippy::needless_pass_by_ref_mut)]` on by default

warning: this OR pattern can be rewritten using a range --> src/logging/mod.rs:58:9 | 58 | 0 | 1 | 2 | 3 => logging_builder | ^^^^^^^^^^^^^ help: try: `0..=3` | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_patterns = note: `#[warn(clippy::manual_range_patterns)]` on by default

warning: useless conversion to the same type: `u32` --> src/sys.rs:124:42 | 124 | if libc::initgroups(pwd.pw_name, pwd.pw_gid.try_into().unwrap()) != 0 { | ^^^^^^^^^^^^^^^^^^^^^ | = help: consider removing `.try_into()` = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion = note: `#[warn(clippy::useless_conversion)]` on by default