warning: this `match` can be collapsed into the outer `if let` --> crates/shadowsocks-service/src/local/redir/udprelay/sys/unix/macos.rs:58:21 | 58 | / match errno { 59 | | libc::ENOPROTOOPT => { 60 | | trace!("failed to set SO_REUSEPORT, error: {}", err); 61 | | } ... | 65 | | } 66 | | } | |_____________________^ | help: the outer pattern can be modified to include the inner pattern --> crates/shadowsocks-service/src/local/redir/udprelay/sys/unix/macos.rs:57:29 | 57 | if let Some(errno) = err.raw_os_error() { | ^^^^^ replace this binding 58 | match errno { 59 | libc::ENOPROTOOPT => { | ^^^^^^^^^^^^^^^^^ with this pattern = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match = note: `#[warn(clippy::collapsible_match)]` on by default