[INFO] cloning repository https://github.com/YIPG/trust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/YIPG/trust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYIPG%2Ftrust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYIPG%2Ftrust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2f146da2c4c98fa4896f1a04aa22fbc73850e47f
[INFO] checking YIPG/trust against master#bca37a20bd376ce3fd138e7cdee7fe704e0f8814 for pr-139493-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYIPG%2Ftrust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/YIPG/trust
[INFO] finished tweaking git repo https://github.com/YIPG/trust
[INFO] tweaked toml for git repo https://github.com/YIPG/trust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/YIPG/trust on toolchain bca37a20bd376ce3fd138e7cdee7fe704e0f8814
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/YIPG/trust 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" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tun-tap v0.1.2
[INFO] [stderr]   Downloaded tokio-core v0.1.17
[INFO] [stderr]   Downloaded scoped-tls v0.1.2
[INFO] [stderr]   Downloaded etherparse v0.9.0
[INFO] [stderr]   Downloaded futures v0.1.29
[INFO] [stderr]   Downloaded libc v0.2.76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed799762f8426e82a178690ed4c00ef3cb846fbadbd19ec7e906d895354c8e97
[INFO] running `Command { std: "docker" "start" "-a" "ed799762f8426e82a178690ed4c00ef3cb846fbadbd19ec7e906d895354c8e97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed799762f8426e82a178690ed4c00ef3cb846fbadbd19ec7e906d895354c8e97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed799762f8426e82a178690ed4c00ef3cb846fbadbd19ec7e906d895354c8e97", kill_on_drop: false }`
[INFO] [stdout] ed799762f8426e82a178690ed4c00ef3cb846fbadbd19ec7e906d895354c8e97
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+bca37a20bd376ce3fd138e7cdee7fe704e0f8814" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7b90d600853d68da56be3f747520c63aaf2d9cff424d0e866afd6329c1ca2c62
[INFO] running `Command { std: "docker" "start" "-a" "7b90d600853d68da56be3f747520c63aaf2d9cff424d0e866afd6329c1ca2c62", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling cc v1.0.59
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking etherparse v0.9.0
[INFO] [stderr]    Compiling tun-tap v0.1.2
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking trust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tcp.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |         let mut c = 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:113:13
[INFO] [stdout]     |
[INFO] [stdout] 113 |         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:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |         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:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |         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:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         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:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         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:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         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:51:43
[INFO] [stdout]    |
[INFO] [stdout] 51 | ...                   Entry::Vacant(mut e) => {
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed` and `Listen` are never constructed
[INFO] [stdout]  --> src/tcp.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum State {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 4 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 5 |     Listen,
[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`, `wnd`, `up`, `wl1`, and `wl2` are never read
[INFO] [stdout]   --> src/tcp.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct SendSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] 30 |     /// send unacknowledged
[INFO] [stdout] 31 |     una: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 32 |     /// send next
[INFO] [stdout] 33 |     nxt: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 34 |     /// send window
[INFO] [stdout] 35 |     wnd: u16,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 36 |     /// send urgent pointer
[INFO] [stdout] 37 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 38 |     /// segment sequence number used for last window update
[INFO] [stdout] 39 |     wl1: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 40 |     /// segment acknowledgment number used for last window update
[INFO] [stdout] 41 |     wl2: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `up` and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct RecvSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 64 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 65 |     /// initial receive sequence number
[INFO] [stdout] 66 |     irs: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 |             ip.write(&mut unwriten);
[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] 133 |             let _ = ip.write(&mut unwriten);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:134:13
[INFO] [stdout]     |
[INFO] [stdout] 134 |             syn_ack.write(&mut unwriten);
[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] 134 |             let _ = syn_ack.write(&mut unwriten);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/tcp.rs:83:13
[INFO] [stdout]    |
[INFO] [stdout] 83 |         let mut c = 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:113:13
[INFO] [stdout]     |
[INFO] [stdout] 113 |         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:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |         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:143:9
[INFO] [stdout]     |
[INFO] [stdout] 143 |         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:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 |         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:145:9
[INFO] [stdout]     |
[INFO] [stdout] 145 |         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:146:9
[INFO] [stdout]     |
[INFO] [stdout] 146 |         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:51:43
[INFO] [stdout]    |
[INFO] [stdout] 51 | ...                   Entry::Vacant(mut e) => {
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed` and `Listen` are never constructed
[INFO] [stdout]  --> src/tcp.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | enum State {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 4 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 5 |     Listen,
[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`, `wnd`, `up`, `wl1`, and `wl2` are never read
[INFO] [stdout]   --> src/tcp.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct SendSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] 30 |     /// send unacknowledged
[INFO] [stdout] 31 |     una: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 32 |     /// send next
[INFO] [stdout] 33 |     nxt: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 34 |     /// send window
[INFO] [stdout] 35 |     wnd: u16,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 36 |     /// send urgent pointer
[INFO] [stdout] 37 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 38 |     /// segment sequence number used for last window update
[INFO] [stdout] 39 |     wl1: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 40 |     /// segment acknowledgment number used for last window update
[INFO] [stdout] 41 |     wl2: usize,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `up` and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct RecvSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 64 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 65 |     /// initial receive sequence number
[INFO] [stdout] 66 |     irs: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 |             ip.write(&mut unwriten);
[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] 133 |             let _ = ip.write(&mut unwriten);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:134:13
[INFO] [stdout]     |
[INFO] [stdout] 134 |             syn_ack.write(&mut unwriten);
[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] 134 |             let _ = syn_ack.write(&mut unwriten);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.81s
[INFO] running `Command { std: "docker" "inspect" "7b90d600853d68da56be3f747520c63aaf2d9cff424d0e866afd6329c1ca2c62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b90d600853d68da56be3f747520c63aaf2d9cff424d0e866afd6329c1ca2c62", kill_on_drop: false }`
[INFO] [stdout] 7b90d600853d68da56be3f747520c63aaf2d9cff424d0e866afd6329c1ca2c62
