[INFO] cloning repository https://github.com/Lovenson2000/tcp-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lovenson2000/tcp-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLovenson2000%2Ftcp-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLovenson2000%2Ftcp-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5229f9f2c8a02352cf2788523f45ae7d47e43134
[INFO] checking Lovenson2000/tcp-rust against try#e117153a45c546e883c1f91d82611775fcaeffe0 for pr-146470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLovenson2000%2Ftcp-rust" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Lovenson2000/tcp-rust
[INFO] finished tweaking git repo https://github.com/Lovenson2000/tcp-rust
[INFO] tweaked toml for git repo https://github.com/Lovenson2000/tcp-rust written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Lovenson2000/tcp-rust on toolchain e117153a45c546e883c1f91d82611775fcaeffe0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e117153a45c546e883c1f91d82611775fcaeffe0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Lovenson2000/tcp-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e117153a45c546e883c1f91d82611775fcaeffe0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tun-tap v0.1.2
[INFO] [stderr]   Downloaded etherparse v0.8.3
[INFO] [stderr]   Downloaded tokio-core v0.1.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+e117153a45c546e883c1f91d82611775fcaeffe0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8fe5665eeaa429b6f7ad146385bfafec9907c928576ea21e69cb06881d074ef6
[INFO] running `Command { std: "docker" "start" "-a" "8fe5665eeaa429b6f7ad146385bfafec9907c928576ea21e69cb06881d074ef6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8fe5665eeaa429b6f7ad146385bfafec9907c928576ea21e69cb06881d074ef6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fe5665eeaa429b6f7ad146385bfafec9907c928576ea21e69cb06881d074ef6", kill_on_drop: false }`
[INFO] [stdout] 8fe5665eeaa429b6f7ad146385bfafec9907c928576ea21e69cb06881d074ef6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+e117153a45c546e883c1f91d82611775fcaeffe0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c85d0276b528de194a59e778c0f4b6242d12f38d48c5d63a243b31dfac96476a
[INFO] running `Command { std: "docker" "start" "-a" "c85d0276b528de194a59e778c0f4b6242d12f38d48c5d63a243b31dfac96476a", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling parking_lot_core v0.6.3
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking net2 v0.2.39
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]    Compiling tun-tap v0.1.2
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking etherparse v0.8.3
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking crossbeam-deque v0.7.4
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.18
[INFO] [stderr]     Checking tcp-imple v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tcp.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut connecion = Connection {
[INFO] [stdout]    |             ----^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tcp.rs:102:15
[INFO] [stdout]     |
[INFO] [stdout] 102 |           let mut ip = etherparse::Ipv4Header::new(
[INFO] [stdout]     |               ----^^
[INFO] [stdout]     |               |
[INFO] [stdout]     |               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/tcp.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         data: &'a [u8], 
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nic`
[INFO] [stdout]    --> src/tcp.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         nic: &mut tun_tap::Iface,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_nic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iph`
[INFO] [stdout]    --> src/tcp.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |         iph: etherparse::Ipv4HeaderSlice<'a>,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_iph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tcph`
[INFO] [stdout]    --> src/tcp.rs:142:9
[INFO] [stdout]     |
[INFO] [stdout] 142 |         tcph: etherparse::TcpHeaderSlice<'a>,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_tcph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tcp.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |         data: &'a [u8],
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:48:43
[INFO] [stdout]    |
[INFO] [stdout] 48 | ...                   Entry::Vacant(mut e) => {
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed`, `Listen`, and `Estab` are never constructed
[INFO] [stdout]  --> src/tcp.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum State {
[INFO] [stdout]   |          ----- variants in this enum
[INFO] [stdout] 4 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 5 |     Listen,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 6 |     SynRcvd,
[INFO] [stdout] 7 |     Estab,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]   --> src/tcp.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Connection {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 11 |     state: State,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `una`, `nxt`, `up`, `wl1`, and `wl2` are never read
[INFO] [stdout]   --> src/tcp.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct SendSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] 32 |     una: u32, // send unacknowledged
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 33 |     nxt: u32, // send next
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 34 |     wnd: u16, // send window
[INFO] [stdout] 35 |     up: bool, // send urgent pointer
[INFO] [stdout]    |     ^^
[INFO] [stdout] 36 |     wl1: usize, // send segment sequence number used for last window update
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 37 |     wl2: usize, // send segment acknowledgment  number used for last window
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `wnd`, `up`, and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct ReceiveSequenceSpace {
[INFO] [stdout]    |        -------------------- fields in this struct
[INFO] [stdout] 55 |     nxt: u32, // receive next
[INFO] [stdout] 56 |     wnd: u16, // receive window
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 57 |     up: bool, // receive urgent pointer
[INFO] [stdout]    |     ^^
[INFO] [stdout] 58 |     irs: u32, // receive initial receive sequence number
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:127:15
[INFO] [stdout]     |
[INFO] [stdout] 127 |               ip.write(&mut unwritten);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 127 |               let _ = ip.write(&mut unwritten);
[INFO] [stdout]     |               +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:128:15
[INFO] [stdout]     |
[INFO] [stdout] 128 |               syn_ack.write(&mut unwritten);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 128 |               let _ = syn_ack.write(&mut unwritten);
[INFO] [stdout]     |               +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tcp.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |         let mut connecion = Connection {
[INFO] [stdout]    |             ----^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tcp.rs:102:15
[INFO] [stdout]     |
[INFO] [stdout] 102 |           let mut ip = etherparse::Ipv4Header::new(
[INFO] [stdout]     |               ----^^
[INFO] [stdout]     |               |
[INFO] [stdout]     |               help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> src/tcp.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         data: &'a [u8], 
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nic`
[INFO] [stdout]    --> src/tcp.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         nic: &mut tun_tap::Iface,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_nic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iph`
[INFO] [stdout]    --> src/tcp.rs:141:9
[INFO] [stdout]     |
[INFO] [stdout] 141 |         iph: etherparse::Ipv4HeaderSlice<'a>,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_iph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tcph`
[INFO] [stdout]    --> src/tcp.rs:142:9
[INFO] [stdout]     |
[INFO] [stdout] 142 |         tcph: etherparse::TcpHeaderSlice<'a>,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_tcph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tcp.rs:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |         data: &'a [u8],
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:48:43
[INFO] [stdout]    |
[INFO] [stdout] 48 | ...                   Entry::Vacant(mut e) => {
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed`, `Listen`, and `Estab` are never constructed
[INFO] [stdout]  --> src/tcp.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub enum State {
[INFO] [stdout]   |          ----- variants in this enum
[INFO] [stdout] 4 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 5 |     Listen,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 6 |     SynRcvd,
[INFO] [stdout] 7 |     Estab,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `state` is never read
[INFO] [stdout]   --> src/tcp.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Connection {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 11 |     state: State,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `una`, `nxt`, `up`, `wl1`, and `wl2` are never read
[INFO] [stdout]   --> src/tcp.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct SendSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] 32 |     una: u32, // send unacknowledged
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 33 |     nxt: u32, // send next
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 34 |     wnd: u16, // send window
[INFO] [stdout] 35 |     up: bool, // send urgent pointer
[INFO] [stdout]    |     ^^
[INFO] [stdout] 36 |     wl1: usize, // send segment sequence number used for last window update
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 37 |     wl2: usize, // send segment acknowledgment  number used for last window
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `wnd`, `up`, and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct ReceiveSequenceSpace {
[INFO] [stdout]    |        -------------------- fields in this struct
[INFO] [stdout] 55 |     nxt: u32, // receive next
[INFO] [stdout] 56 |     wnd: u16, // receive window
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 57 |     up: bool, // receive urgent pointer
[INFO] [stdout]    |     ^^
[INFO] [stdout] 58 |     irs: u32, // receive initial receive sequence number
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:127:15
[INFO] [stdout]     |
[INFO] [stdout] 127 |               ip.write(&mut unwritten);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 127 |               let _ = ip.write(&mut unwritten);
[INFO] [stdout]     |               +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:128:15
[INFO] [stdout]     |
[INFO] [stdout] 128 |               syn_ack.write(&mut unwritten);
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 128 |               let _ = syn_ack.write(&mut unwritten);
[INFO] [stdout]     |               +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.41s
[INFO] running `Command { std: "docker" "inspect" "c85d0276b528de194a59e778c0f4b6242d12f38d48c5d63a243b31dfac96476a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c85d0276b528de194a59e778c0f4b6242d12f38d48c5d63a243b31dfac96476a", kill_on_drop: false }`
[INFO] [stdout] c85d0276b528de194a59e778c0f4b6242d12f38d48c5d63a243b31dfac96476a
