[INFO] cloning repository https://github.com/szyth/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/szyth/tcp-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszyth%2Ftcp-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszyth%2Ftcp-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b71e179e07644abd6042eba7cd9d2d2ca87b27c
[INFO] checking szyth/tcp-rust against master#cb40c25f6aebb637163d26bf76a680ed6e5d1eda for pr-156157-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fszyth%2Ftcp-rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/szyth/tcp-rust
[INFO] finished tweaking git repo https://github.com/szyth/tcp-rust
[INFO] tweaked toml for git repo https://github.com/szyth/tcp-rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/szyth/tcp-rust on toolchain cb40c25f6aebb637163d26bf76a680ed6e5d1eda
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/szyth/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" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 2 packages to latest compatible versions
[INFO] [stderr]       Adding arrayvec v0.7.6
[INFO] [stderr]       Adding etherparse v0.13.0 (available: v0.20.1)
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tun-tap v0.1.4
[INFO] [stderr]   Downloaded tokio-core v0.1.18
[INFO] [stderr]   Downloaded hermit-abi v0.3.3
[INFO] [stderr]   Downloaded tokio-io v0.1.13
[INFO] [stderr]   Downloaded tokio-uds v0.2.7
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.3
[INFO] [stderr]   Downloaded tokio-tcp v0.1.4
[INFO] [stderr]   Downloaded tokio-udp v0.1.6
[INFO] [stderr]   Downloaded mio-uds v0.6.8
[INFO] [stderr]   Downloaded tokio-codec v0.1.2
[INFO] [stderr]   Downloaded scoped-tls v0.1.2
[INFO] [stderr]   Downloaded tokio-reactor v0.1.12
[INFO] [stderr]   Downloaded lock_api v0.3.4
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.4
[INFO] [stderr]   Downloaded memoffset v0.5.6
[INFO] [stderr]   Downloaded tokio-fs v0.1.7
[INFO] [stderr]   Downloaded tokio-current-thread v0.1.7
[INFO] [stderr]   Downloaded tokio-sync v0.1.8
[INFO] [stderr]   Downloaded bytes v0.4.12
[INFO] [stderr]   Downloaded crossbeam-epoch v0.8.2
[INFO] [stderr]   Downloaded parking_lot v0.9.0
[INFO] [stderr]   Downloaded tokio-threadpool v0.1.18
[INFO] [stderr]   Downloaded parking_lot_core v0.6.3
[INFO] [stderr]   Downloaded tokio v0.1.22
[INFO] [stderr]   Downloaded etherparse v0.13.0
[INFO] [stderr]   Downloaded libc v0.2.151
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a3b63be87810e3f735fac8252a4599c56d1a5c5a5987a4fbc133b8e7ce0bf045
[INFO] running `Command { std: "docker" "start" "-a" "a3b63be87810e3f735fac8252a4599c56d1a5c5a5987a4fbc133b8e7ce0bf045", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a3b63be87810e3f735fac8252a4599c56d1a5c5a5987a4fbc133b8e7ce0bf045", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3b63be87810e3f735fac8252a4599c56d1a5c5a5987a4fbc133b8e7ce0bf045", kill_on_drop: false }`
[INFO] [stdout] a3b63be87810e3f735fac8252a4599c56d1a5c5a5987a4fbc133b8e7ce0bf045
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cb40c25f6aebb637163d26bf76a680ed6e5d1eda" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ab0808d91a82204e3ab06b8a49b5f75f4c6abd4f8474976be77c2fec8960e78a
[INFO] running `Command { std: "docker" "start" "-a" "ab0808d91a82204e3ab06b8a49b5f75f4c6abd4f8474976be77c2fec8960e78a", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking etherparse v0.13.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling parking_lot_core v0.6.3
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking crossbeam-queue v0.2.3
[INFO] [stderr]     Checking crossbeam-deque v0.7.4
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking net2 v0.2.39
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking tokio-current-thread v0.1.7
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]     Checking tokio-fs v0.1.7
[INFO] [stderr]    Compiling tun-tap v0.1.4
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio-uds v0.2.7
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-core v0.1.18
[INFO] [stderr]     Checking tcp-rust 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 conn = 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:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |         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:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         data: &[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:160:9
[INFO] [stdout]     |
[INFO] [stdout] 160 |         nic: &mut Iface,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_nic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_header`
[INFO] [stdout]    --> src/tcp.rs:161:9
[INFO] [stdout]     |
[INFO] [stdout] 161 |         ip_header: etherparse::Ipv4HeaderSlice,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_header`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tcp_header`
[INFO] [stdout]    --> src/tcp.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |         tcp_header: TcpHeaderSlice,
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tcp_header`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tcp.rs:163:9
[INFO] [stdout]     |
[INFO] [stdout] 163 |         data: &[u8],
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed` and `Listen` are never constructed
[INFO] [stdout]  --> src/tcp.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum State {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 5 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 6 |     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:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Connection {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 12 |     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: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] ...
[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 `wnd`, `up`, and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct RecvSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 61 |     wnd: u16,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 62 |     // receive urgent pointer
[INFO] [stdout] 63 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 64 |     // initial receive sequence number
[INFO] [stdout] 65 |     irs: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |         nic.send(&buf[..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] 153 |         let _ = nic.send(&buf[..unwritten]);
[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 conn = 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:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |         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:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         data: &[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:160:9
[INFO] [stdout]     |
[INFO] [stdout] 160 |         nic: &mut Iface,
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_nic`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_header`
[INFO] [stdout]    --> src/tcp.rs:161:9
[INFO] [stdout]     |
[INFO] [stdout] 161 |         ip_header: etherparse::Ipv4HeaderSlice,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_header`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `tcp_header`
[INFO] [stdout]    --> src/tcp.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |         tcp_header: TcpHeaderSlice,
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_tcp_header`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]    --> src/tcp.rs:163:9
[INFO] [stdout]     |
[INFO] [stdout] 163 |         data: &[u8],
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Closed` and `Listen` are never constructed
[INFO] [stdout]  --> src/tcp.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum State {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 5 |     Closed,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 6 |     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:12:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Connection {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 12 |     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: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] ...
[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 `wnd`, `up`, and `irs` are never read
[INFO] [stdout]   --> src/tcp.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 57 | struct RecvSequenceSpace {
[INFO] [stdout]    |        ----------------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 61 |     wnd: u16,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 62 |     // receive urgent pointer
[INFO] [stdout] 63 |     up: bool,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 64 |     // initial receive sequence number
[INFO] [stdout] 65 |     irs: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |         nic.send(&buf[..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] 153 |         let _ = nic.send(&buf[..unwritten]);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.47s
[INFO] running `Command { std: "docker" "inspect" "ab0808d91a82204e3ab06b8a49b5f75f4c6abd4f8474976be77c2fec8960e78a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab0808d91a82204e3ab06b8a49b5f75f4c6abd4f8474976be77c2fec8960e78a", kill_on_drop: false }`
[INFO] [stdout] ab0808d91a82204e3ab06b8a49b5f75f4c6abd4f8474976be77c2fec8960e78a
