[INFO] updating cached repository nicdk/smtpd-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nicdk/smtpd-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nicdk/smtpd-rs" "work/ex/clippy-test-run/sources/stable/gh/nicdk/smtpd-rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/nicdk/smtpd-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nicdk/smtpd-rs" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/nicdk/smtpd-rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/nicdk/smtpd-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ebfd2595791b9fb88f8649bb4442139c3c7ebc0c
[INFO] sha for GitHub repo nicdk/smtpd-rs: ebfd2595791b9fb88f8649bb4442139c3c7ebc0c
[INFO] validating manifest of nicdk/smtpd-rs on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of nicdk/smtpd-rs on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing nicdk/smtpd-rs
[INFO] finished frobbing nicdk/smtpd-rs
[INFO] frobbed toml for nicdk/smtpd-rs written to work/ex/clippy-test-run/sources/stable/gh/nicdk/smtpd-rs/Cargo.toml
[INFO] started frobbing nicdk/smtpd-rs
[INFO] finished frobbing nicdk/smtpd-rs
[INFO] frobbed toml for nicdk/smtpd-rs written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/nicdk/smtpd-rs/Cargo.toml
[INFO] crate nicdk/smtpd-rs has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting nicdk/smtpd-rs against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/nicdk/smtpd-rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 0e23086f7585818dfca47d59e544d780de0b9ff832e4c7d374e682bbc37a0ecc
[INFO] running `"docker" "start" "-a" "0e23086f7585818dfca47d59e544d780de0b9ff832e4c7d374e682bbc37a0ecc"`
[INFO] [stderr]     Checking smtpd-rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the function has a cyclomatic complexity of 28
[INFO] [stderr]    --> src/bin/receiver.rs:46:1
[INFO] [stderr]     |
[INFO] [stderr] 46  | / pub fn handler(stream: &mut BufStream<TcpStream>) -> io::Result<()> {
[INFO] [stderr] 47  | |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr] 48  | |     stream.flush()?;
[INFO] [stderr] 49  | |     let mut state = SmtpState::INIT;
[INFO] [stderr] ...   |
[INFO] [stderr] 325 | |     }
[INFO] [stderr] 326 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:66:25
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/bin/receiver.rs:66:38
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"555 5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:77:25
[INFO] [stderr]    |
[INFO] [stderr] 77 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:82:25
[INFO] [stderr]    |
[INFO] [stderr] 82 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/bin/receiver.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 match &_cmd {
[INFO] [stderr] 89 | |                     &"HELO" => SmtpState::READY,
[INFO] [stderr] 90 | |                     &"EHLO" => SmtpState::READY,
[INFO] [stderr] 91 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |                     _ => SmtpState::INIT,
[INFO] [stderr] 99 | |                 }
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 match _cmd {
[INFO] [stderr] 89 |                     "HELO" => SmtpState::READY,
[INFO] [stderr] 90 |                     "EHLO" => SmtpState::READY,
[INFO] [stderr] 91 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 92 |                     "QUIT" => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:94:25
[INFO] [stderr]    |
[INFO] [stderr] 94 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:113:25
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:124:25
[INFO] [stderr]     |
[INFO] [stderr] 124 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:132:36
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                 if _from.to_uppercase().to_string() != "FROM:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_from.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:143:25
[INFO] [stderr]     |
[INFO] [stderr] 143 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:149:17
[INFO] [stderr]     |
[INFO] [stderr] 149 | /                 match &_cmd {
[INFO] [stderr] 150 | |                     &"MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 152 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 158 | |                     _ => SmtpState::READY,
[INFO] [stderr] 159 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 match _cmd {
[INFO] [stderr] 150 |                     "MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 152 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:154:25
[INFO] [stderr]     |
[INFO] [stderr] 154 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:173:25
[INFO] [stderr]     |
[INFO] [stderr] 173 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:184:25
[INFO] [stderr]     |
[INFO] [stderr] 184 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:192:36
[INFO] [stderr]     |
[INFO] [stderr] 192 |                                 if _to.to_uppercase().to_string() != "TO:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_to.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:209:17
[INFO] [stderr]     |
[INFO] [stderr] 209 | /                 match &_cmd {
[INFO] [stderr] 210 | |                     &"RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 212 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 218 | |                     _ => SmtpState::MAIL,
[INFO] [stderr] 219 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 209 |                 match _cmd {
[INFO] [stderr] 210 |                     "RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 212 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:214:25
[INFO] [stderr]     |
[INFO] [stderr] 214 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:233:25
[INFO] [stderr]     |
[INFO] [stderr] 233 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:244:25
[INFO] [stderr]     |
[INFO] [stderr] 244 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:249:25
[INFO] [stderr]     |
[INFO] [stderr] 249 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 | /                 match &_cmd {
[INFO] [stderr] 256 | |                     &"DATA" => SmtpState::DATA,
[INFO] [stderr] 257 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 258 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 264 | |                     _ => SmtpState::RCPT,
[INFO] [stderr] 265 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 match _cmd {
[INFO] [stderr] 256 |                     "DATA" => SmtpState::DATA,
[INFO] [stderr] 257 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 258 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:260:25
[INFO] [stderr]     |
[INFO] [stderr] 260 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:277:24
[INFO] [stderr]     |
[INFO] [stderr] 277 |                     if _l.trim().to_string() == "." { break; }
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:278:24
[INFO] [stderr]     |
[INFO] [stderr] 278 |                     if _l.trim().to_string() == ".." {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:289:21
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:289:34
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. FROM address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:293:21
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:293:34
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted.RCPT address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:297:21
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:297:34
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. DATA context is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:318:21
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:318:34
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"250 OK\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/bin/receiver.rs:328:22
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn dispatch(command: &String) -> Option<SmtpReply> {
[INFO] [stderr]     |                      ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:342:34
[INFO] [stderr]     |
[INFO] [stderr] 342 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:349:38
[INFO] [stderr]     |
[INFO] [stderr] 349 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:369:34
[INFO] [stderr]     |
[INFO] [stderr] 369 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:376:38
[INFO] [stderr]     |
[INFO] [stderr] 376 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:393:26
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:402:26
[INFO] [stderr]     |
[INFO] [stderr] 402 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:409:26
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 message: format!("Start mail input; end with <CRLF>.<CRLF>\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Start mail input; end with <CRLF>.<CRLF>\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:416:26
[INFO] [stderr]     |
[INFO] [stderr] 416 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:423:26
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:430:26
[INFO] [stderr]     |
[INFO] [stderr] 430 |                 message: format!("Closing connection. Good bye.\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Closing connection. Good bye.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:437:26
[INFO] [stderr]     |
[INFO] [stderr] 437 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:444:26
[INFO] [stderr]     |
[INFO] [stderr] 444 |                 message: format!(r"5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `r"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 21 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `smtpd-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the function has a cyclomatic complexity of 28
[INFO] [stderr]    --> src/bin/receiver.rs:46:1
[INFO] [stderr]     |
[INFO] [stderr] 46  | / pub fn handler(stream: &mut BufStream<TcpStream>) -> io::Result<()> {
[INFO] [stderr] 47  | |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr] 48  | |     stream.flush()?;
[INFO] [stderr] 49  | |     let mut state = SmtpState::INIT;
[INFO] [stderr] ...   |
[INFO] [stderr] 325 | |     }
[INFO] [stderr] 326 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:66:25
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/bin/receiver.rs:66:38
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"555 5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:77:25
[INFO] [stderr]    |
[INFO] [stderr] 77 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:82:25
[INFO] [stderr]    |
[INFO] [stderr] 82 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/bin/receiver.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 match &_cmd {
[INFO] [stderr] 89 | |                     &"HELO" => SmtpState::READY,
[INFO] [stderr] 90 | |                     &"EHLO" => SmtpState::READY,
[INFO] [stderr] 91 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |                     _ => SmtpState::INIT,
[INFO] [stderr] 99 | |                 }
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 match _cmd {
[INFO] [stderr] 89 |                     "HELO" => SmtpState::READY,
[INFO] [stderr] 90 |                     "EHLO" => SmtpState::READY,
[INFO] [stderr] 91 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 92 |                     "QUIT" => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:94:25
[INFO] [stderr]    |
[INFO] [stderr] 94 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:113:25
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:124:25
[INFO] [stderr]     |
[INFO] [stderr] 124 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:132:36
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                 if _from.to_uppercase().to_string() != "FROM:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_from.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:143:25
[INFO] [stderr]     |
[INFO] [stderr] 143 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:149:17
[INFO] [stderr]     |
[INFO] [stderr] 149 | /                 match &_cmd {
[INFO] [stderr] 150 | |                     &"MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 152 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 158 | |                     _ => SmtpState::READY,
[INFO] [stderr] 159 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 match _cmd {
[INFO] [stderr] 150 |                     "MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 152 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:154:25
[INFO] [stderr]     |
[INFO] [stderr] 154 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:173:25
[INFO] [stderr]     |
[INFO] [stderr] 173 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:184:25
[INFO] [stderr]     |
[INFO] [stderr] 184 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:192:36
[INFO] [stderr]     |
[INFO] [stderr] 192 |                                 if _to.to_uppercase().to_string() != "TO:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_to.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:209:17
[INFO] [stderr]     |
[INFO] [stderr] 209 | /                 match &_cmd {
[INFO] [stderr] 210 | |                     &"RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 212 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 218 | |                     _ => SmtpState::MAIL,
[INFO] [stderr] 219 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 209 |                 match _cmd {
[INFO] [stderr] 210 |                     "RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 212 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:214:25
[INFO] [stderr]     |
[INFO] [stderr] 214 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:233:25
[INFO] [stderr]     |
[INFO] [stderr] 233 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:244:25
[INFO] [stderr]     |
[INFO] [stderr] 244 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:249:25
[INFO] [stderr]     |
[INFO] [stderr] 249 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 | /                 match &_cmd {
[INFO] [stderr] 256 | |                     &"DATA" => SmtpState::DATA,
[INFO] [stderr] 257 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 258 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 264 | |                     _ => SmtpState::RCPT,
[INFO] [stderr] 265 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 match _cmd {
[INFO] [stderr] 256 |                     "DATA" => SmtpState::DATA,
[INFO] [stderr] 257 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 258 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:260:25
[INFO] [stderr]     |
[INFO] [stderr] 260 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:277:24
[INFO] [stderr]     |
[INFO] [stderr] 277 |                     if _l.trim().to_string() == "." { break; }
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:278:24
[INFO] [stderr]     |
[INFO] [stderr] 278 |                     if _l.trim().to_string() == ".." {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:289:21
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:289:34
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. FROM address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:293:21
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:293:34
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted.RCPT address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:297:21
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:297:34
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. DATA context is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:318:21
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:318:34
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"250 OK\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/bin/receiver.rs:328:22
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn dispatch(command: &String) -> Option<SmtpReply> {
[INFO] [stderr]     |                      ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:342:34
[INFO] [stderr]     |
[INFO] [stderr] 342 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:349:38
[INFO] [stderr]     |
[INFO] [stderr] 349 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:369:34
[INFO] [stderr]     |
[INFO] [stderr] 369 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:376:38
[INFO] [stderr]     |
[INFO] [stderr] 376 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:393:26
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:402:26
[INFO] [stderr]     |
[INFO] [stderr] 402 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:409:26
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 message: format!("Start mail input; end with <CRLF>.<CRLF>\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Start mail input; end with <CRLF>.<CRLF>\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:416:26
[INFO] [stderr]     |
[INFO] [stderr] 416 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:423:26
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:430:26
[INFO] [stderr]     |
[INFO] [stderr] 430 |                 message: format!("Closing connection. Good bye.\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Closing connection. Good bye.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:437:26
[INFO] [stderr]     |
[INFO] [stderr] 437 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:444:26
[INFO] [stderr]     |
[INFO] [stderr] 444 |                 message: format!(r"5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `r"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 21 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `smtpd-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the function has a cyclomatic complexity of 28
[INFO] [stderr]    --> src/bin/receiver.rs:46:1
[INFO] [stderr]     |
[INFO] [stderr] 46  | / pub fn handler(stream: &mut BufStream<TcpStream>) -> io::Result<()> {
[INFO] [stderr] 47  | |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr] 48  | |     stream.flush()?;
[INFO] [stderr] 49  | |     let mut state = SmtpState::INIT;
[INFO] [stderr] ...   |
[INFO] [stderr] 325 | |     }
[INFO] [stderr] 326 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:66:25
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/bin/receiver.rs:66:38
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"555 5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:77:25
[INFO] [stderr]    |
[INFO] [stderr] 77 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:82:25
[INFO] [stderr]    |
[INFO] [stderr] 82 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/bin/receiver.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 match &_cmd {
[INFO] [stderr] 89 | |                     &"HELO" => SmtpState::READY,
[INFO] [stderr] 90 | |                     &"EHLO" => SmtpState::READY,
[INFO] [stderr] 91 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |                     _ => SmtpState::INIT,
[INFO] [stderr] 99 | |                 }
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 match _cmd {
[INFO] [stderr] 89 |                     "HELO" => SmtpState::READY,
[INFO] [stderr] 90 |                     "EHLO" => SmtpState::READY,
[INFO] [stderr] 91 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 92 |                     "QUIT" => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:94:25
[INFO] [stderr]    |
[INFO] [stderr] 94 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:113:25
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:124:25
[INFO] [stderr]     |
[INFO] [stderr] 124 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:132:36
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                 if _from.to_uppercase().to_string() != "FROM:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_from.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:143:25
[INFO] [stderr]     |
[INFO] [stderr] 143 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:149:17
[INFO] [stderr]     |
[INFO] [stderr] 149 | /                 match &_cmd {
[INFO] [stderr] 150 | |                     &"MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 152 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 158 | |                     _ => SmtpState::READY,
[INFO] [stderr] 159 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 match _cmd {
[INFO] [stderr] 150 |                     "MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 152 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:154:25
[INFO] [stderr]     |
[INFO] [stderr] 154 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:173:25
[INFO] [stderr]     |
[INFO] [stderr] 173 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:184:25
[INFO] [stderr]     |
[INFO] [stderr] 184 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:192:36
[INFO] [stderr]     |
[INFO] [stderr] 192 |                                 if _to.to_uppercase().to_string() != "TO:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_to.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:209:17
[INFO] [stderr]     |
[INFO] [stderr] 209 | /                 match &_cmd {
[INFO] [stderr] 210 | |                     &"RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 212 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 218 | |                     _ => SmtpState::MAIL,
[INFO] [stderr] 219 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 209 |                 match _cmd {
[INFO] [stderr] 210 |                     "RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 212 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:214:25
[INFO] [stderr]     |
[INFO] [stderr] 214 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:233:25
[INFO] [stderr]     |
[INFO] [stderr] 233 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:244:25
[INFO] [stderr]     |
[INFO] [stderr] 244 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:249:25
[INFO] [stderr]     |
[INFO] [stderr] 249 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 | /                 match &_cmd {
[INFO] [stderr] 256 | |                     &"DATA" => SmtpState::DATA,
[INFO] [stderr] 257 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 258 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 264 | |                     _ => SmtpState::RCPT,
[INFO] [stderr] 265 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 match _cmd {
[INFO] [stderr] 256 |                     "DATA" => SmtpState::DATA,
[INFO] [stderr] 257 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 258 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:260:25
[INFO] [stderr]     |
[INFO] [stderr] 260 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:277:24
[INFO] [stderr]     |
[INFO] [stderr] 277 |                     if _l.trim().to_string() == "." { break; }
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:278:24
[INFO] [stderr]     |
[INFO] [stderr] 278 |                     if _l.trim().to_string() == ".." {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:289:21
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:289:34
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. FROM address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:293:21
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:293:34
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted.RCPT address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:297:21
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:297:34
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. DATA context is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:318:21
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:318:34
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"250 OK\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/bin/receiver.rs:328:22
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn dispatch(command: &String) -> Option<SmtpReply> {
[INFO] [stderr]     |                      ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:342:34
[INFO] [stderr]     |
[INFO] [stderr] 342 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:349:38
[INFO] [stderr]     |
[INFO] [stderr] 349 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:369:34
[INFO] [stderr]     |
[INFO] [stderr] 369 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:376:38
[INFO] [stderr]     |
[INFO] [stderr] 376 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:393:26
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:402:26
[INFO] [stderr]     |
[INFO] [stderr] 402 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:409:26
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 message: format!("Start mail input; end with <CRLF>.<CRLF>\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Start mail input; end with <CRLF>.<CRLF>\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:416:26
[INFO] [stderr]     |
[INFO] [stderr] 416 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:423:26
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:430:26
[INFO] [stderr]     |
[INFO] [stderr] 430 |                 message: format!("Closing connection. Good bye.\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Closing connection. Good bye.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:437:26
[INFO] [stderr]     |
[INFO] [stderr] 437 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:444:26
[INFO] [stderr]     |
[INFO] [stderr] 444 |                 message: format!(r"5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `r"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 21 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `smtpd-rs`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the function has a cyclomatic complexity of 28
[INFO] [stderr]    --> src/bin/receiver.rs:46:1
[INFO] [stderr]     |
[INFO] [stderr] 46  | / pub fn handler(stream: &mut BufStream<TcpStream>) -> io::Result<()> {
[INFO] [stderr] 47  | |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr] 48  | |     stream.flush()?;
[INFO] [stderr] 49  | |     let mut state = SmtpState::INIT;
[INFO] [stderr] ...   |
[INFO] [stderr] 325 | |     }
[INFO] [stderr] 326 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     stream.write(b"220 hostname ESMTP smtpd-rs\n")?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:66:25
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/bin/receiver.rs:66:38
[INFO] [stderr]    |
[INFO] [stderr] 66 |                         stream.write(format!("555 5.5.2 Syntax error. - smtpd-rs\n").as_bytes())?;
[INFO] [stderr]    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"555 5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:77:25
[INFO] [stderr]    |
[INFO] [stderr] 77 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:82:25
[INFO] [stderr]    |
[INFO] [stderr] 82 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/bin/receiver.rs:88:17
[INFO] [stderr]    |
[INFO] [stderr] 88 | /                 match &_cmd {
[INFO] [stderr] 89 | |                     &"HELO" => SmtpState::READY,
[INFO] [stderr] 90 | |                     &"EHLO" => SmtpState::READY,
[INFO] [stderr] 91 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] ...  |
[INFO] [stderr] 98 | |                     _ => SmtpState::INIT,
[INFO] [stderr] 99 | |                 }
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 88 |                 match _cmd {
[INFO] [stderr] 89 |                     "HELO" => SmtpState::READY,
[INFO] [stderr] 90 |                     "EHLO" => SmtpState::READY,
[INFO] [stderr] 91 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 92 |                     "QUIT" => {
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]   --> src/bin/receiver.rs:94:25
[INFO] [stderr]    |
[INFO] [stderr] 94 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:113:25
[INFO] [stderr]     |
[INFO] [stderr] 113 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:124:25
[INFO] [stderr]     |
[INFO] [stderr] 124 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:132:36
[INFO] [stderr]     |
[INFO] [stderr] 132 |                                 if _from.to_uppercase().to_string() != "FROM:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_from.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cmp_owned)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:143:25
[INFO] [stderr]     |
[INFO] [stderr] 143 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:149:17
[INFO] [stderr]     |
[INFO] [stderr] 149 | /                 match &_cmd {
[INFO] [stderr] 150 | |                     &"MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 152 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 158 | |                     _ => SmtpState::READY,
[INFO] [stderr] 159 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 149 |                 match _cmd {
[INFO] [stderr] 150 |                     "MAIL" => SmtpState::MAIL,
[INFO] [stderr] 151 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 152 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:154:25
[INFO] [stderr]     |
[INFO] [stderr] 154 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:173:25
[INFO] [stderr]     |
[INFO] [stderr] 173 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:184:25
[INFO] [stderr]     |
[INFO] [stderr] 184 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:192:36
[INFO] [stderr]     |
[INFO] [stderr] 192 |                                 if _to.to_uppercase().to_string() != "TO:" {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `_to.to_uppercase()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:203:25
[INFO] [stderr]     |
[INFO] [stderr] 203 |                         stream.write(b"disconnect.")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:209:17
[INFO] [stderr]     |
[INFO] [stderr] 209 | /                 match &_cmd {
[INFO] [stderr] 210 | |                     &"RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 212 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 218 | |                     _ => SmtpState::MAIL,
[INFO] [stderr] 219 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 209 |                 match _cmd {
[INFO] [stderr] 210 |                     "RCPT" => SmtpState::RCPT,
[INFO] [stderr] 211 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 212 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:214:25
[INFO] [stderr]     |
[INFO] [stderr] 214 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:233:25
[INFO] [stderr]     |
[INFO] [stderr] 233 |                         stream.write(b"555 5.5.2 Syntax error. - smtpd-rs")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:244:25
[INFO] [stderr]     |
[INFO] [stderr] 244 |                         stream.write(&_message.as_bytes())?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:249:25
[INFO] [stderr]     |
[INFO] [stderr] 249 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/bin/receiver.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 | /                 match &_cmd {
[INFO] [stderr] 256 | |                     &"DATA" => SmtpState::DATA,
[INFO] [stderr] 257 | |                     &"RSET" => SmtpState::READY,
[INFO] [stderr] 258 | |                     &"QUIT" => {
[INFO] [stderr] ...   |
[INFO] [stderr] 264 | |                     _ => SmtpState::RCPT,
[INFO] [stderr] 265 | |                 }
[INFO] [stderr]     | |_________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 match _cmd {
[INFO] [stderr] 256 |                     "DATA" => SmtpState::DATA,
[INFO] [stderr] 257 |                     "RSET" => SmtpState::READY,
[INFO] [stderr] 258 |                     "QUIT" => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:260:25
[INFO] [stderr]     |
[INFO] [stderr] 260 |                         stream.write(b"disconnect.\n")?;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:277:24
[INFO] [stderr]     |
[INFO] [stderr] 277 |                     if _l.trim().to_string() == "." { break; }
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] warning: this creates an owned instance just for comparison
[INFO] [stderr]    --> src/bin/receiver.rs:278:24
[INFO] [stderr]     |
[INFO] [stderr] 278 |                     if _l.trim().to_string() == ".." {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^ help: try: `_l.trim()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:289:21
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:289:34
[INFO] [stderr]     |
[INFO] [stderr] 289 |                     stream.write(format!("451 Reequested action aborted. FROM address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. FROM address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:293:21
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:293:34
[INFO] [stderr]     |
[INFO] [stderr] 293 |                     stream.write(format!("451 Reequested action aborted.RCPT address is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted.RCPT address is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:297:21
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:297:34
[INFO] [stderr]     |
[INFO] [stderr] 297 |                     stream.write(format!("451 Reequested action aborted. DATA context is empty.\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"451 Reequested action aborted. DATA context is empty.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/bin/receiver.rs:318:21
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:318:34
[INFO] [stderr]     |
[INFO] [stderr] 318 |                     stream.write(format!("250 OK\n").as_bytes())?;
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"250 OK\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/bin/receiver.rs:328:22
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn dispatch(command: &String) -> Option<SmtpReply> {
[INFO] [stderr]     |                      ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:342:34
[INFO] [stderr]     |
[INFO] [stderr] 342 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:349:38
[INFO] [stderr]     |
[INFO] [stderr] 349 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:369:34
[INFO] [stderr]     |
[INFO] [stderr] 369 |                         message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:376:38
[INFO] [stderr]     |
[INFO] [stderr] 376 |                             message: format!("5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:393:26
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:402:26
[INFO] [stderr]     |
[INFO] [stderr] 402 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:409:26
[INFO] [stderr]     |
[INFO] [stderr] 409 |                 message: format!("Start mail input; end with <CRLF>.<CRLF>\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Start mail input; end with <CRLF>.<CRLF>\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:416:26
[INFO] [stderr]     |
[INFO] [stderr] 416 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:423:26
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:430:26
[INFO] [stderr]     |
[INFO] [stderr] 430 |                 message: format!("Closing connection. Good bye.\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"Closing connection. Good bye.\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:437:26
[INFO] [stderr]     |
[INFO] [stderr] 437 |                 message: format!("2.1.0 OK - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `"2.1.0 OK - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/bin/receiver.rs:444:26
[INFO] [stderr]     |
[INFO] [stderr] 444 |                 message: format!(r"5.5.2 Syntax error. - smtpd-rs\n"),
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `r"5.5.2 Syntax error. - smtpd-rs\n".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 21 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `smtpd-rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0e23086f7585818dfca47d59e544d780de0b9ff832e4c7d374e682bbc37a0ecc"`
[INFO] running `"docker" "rm" "-f" "0e23086f7585818dfca47d59e544d780de0b9ff832e4c7d374e682bbc37a0ecc"`
[INFO] [stdout] 0e23086f7585818dfca47d59e544d780de0b9ff832e4c7d374e682bbc37a0ecc