[INFO] cloning repository https://github.com/justinliew/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/justinliew/tcp_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjustinliew%2Ftcp_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjustinliew%2Ftcp_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c32305b948952348e2605f55ea282faffbea18bc
[INFO] testing justinliew/tcp_rust against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjustinliew%2Ftcp_rust" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/justinliew/tcp_rust on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/justinliew/tcp_rust
[INFO] finished tweaking git repo https://github.com/justinliew/tcp_rust
[INFO] tweaked toml for git repo https://github.com/justinliew/tcp_rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/justinliew/tcp_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /workspace/builds/worker-4/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7a1098cbed2a6e96266a0cfd07976fabbf8121700ca1b35f78254826d69e04da
[INFO] running `Command { std: "docker" "start" "-a" "7a1098cbed2a6e96266a0cfd07976fabbf8121700ca1b35f78254826d69e04da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a1098cbed2a6e96266a0cfd07976fabbf8121700ca1b35f78254826d69e04da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a1098cbed2a6e96266a0cfd07976fabbf8121700ca1b35f78254826d69e04da", kill_on_drop: false }`
[INFO] [stdout] 7a1098cbed2a6e96266a0cfd07976fabbf8121700ca1b35f78254826d69e04da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 628c85798381a6261113ec9b5d2d5052076e3bdcf59c79cac3b8b745aa1c9c5c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "628c85798381a6261113ec9b5d2d5052076e3bdcf59c79cac3b8b745aa1c9c5c", kill_on_drop: false }`
[INFO] [stderr]    Compiling memoffset v0.5.5
[INFO] [stderr]    Compiling tun-tap v0.1.2
[INFO] [stderr]    Compiling tokio-sync v0.1.8
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]    Compiling tokio-executor v0.1.10
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.34
[INFO] [stderr]    Compiling etherparse v0.8.3
[INFO] [stderr]    Compiling tokio-current-thread v0.1.7
[INFO] [stderr]    Compiling tokio-timer v0.2.13
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling tokio-threadpool v0.1.18
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling tcp_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Ord` is imported redundantly
[INFO] [stdout]    --> src/tcp.rs:139:24
[INFO] [stdout]     |
[INFO] [stdout] 139 |         use std::cmp::{Ord,Ordering};
[INFO] [stdout]     |                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/tcp.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |                 (start < x && x < end)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/tcp.rs:148:17
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 (x > start || x < end)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/main.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             Err(e) => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nic`
[INFO] [stdout]    --> src/tcp.rs:155:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |         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:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         iph: etherparse::Ipv4HeaderSlice<'a>, 
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_iph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:45:43
[INFO] [stdout]    |
[INFO] [stdout] 45 | ...                   Entry::Vacant(mut e) =...
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Estab`
[INFO] [stdout]  --> src/tcp.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Estab,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `up`
[INFO] [stdout]   --> src/tcp.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     up: bool,       // send urgent pointer
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `wl1`
[INFO] [stdout]   --> src/tcp.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     wl1: u32,     // segment sequence number used for last window update
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `wl2`
[INFO] [stdout]   --> src/tcp.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     wl2: u32,     // segment acknowledgement number used for last window update 
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `up`
[INFO] [stdout]   --> src/tcp.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     up: bool,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `irs`
[INFO] [stdout]   --> src/tcp.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     irs: u32,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         c.ip.set_payload_len(syn_ack.header_len() as usize);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             c.ip.write(&mut unwritten);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:131:13
[INFO] [stdout]     |
[INFO] [stdout] 131 |             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] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |         nic.send(&buf[..unwritten]);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.42s
[INFO] running `Command { std: "docker" "inspect" "628c85798381a6261113ec9b5d2d5052076e3bdcf59c79cac3b8b745aa1c9c5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "628c85798381a6261113ec9b5d2d5052076e3bdcf59c79cac3b8b745aa1c9c5c", kill_on_drop: false }`
[INFO] [stdout] 628c85798381a6261113ec9b5d2d5052076e3bdcf59c79cac3b8b745aa1c9c5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8a4c548d9ac457857cea096688e169cdc0cd8247b5375657b54d35869c883946
[INFO] running `Command { std: "docker" "start" "-a" "8a4c548d9ac457857cea096688e169cdc0cd8247b5375657b54d35869c883946", kill_on_drop: false }`
[INFO] [stderr]    Compiling tcp_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Ord` is imported redundantly
[INFO] [stdout]    --> src/tcp.rs:139:24
[INFO] [stdout]     |
[INFO] [stdout] 139 |         use std::cmp::{Ord,Ordering};
[INFO] [stdout]     |                        ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/tcp.rs:145:17
[INFO] [stdout]     |
[INFO] [stdout] 145 |                 (start < x && x < end)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/tcp.rs:148:17
[INFO] [stdout]     |
[INFO] [stdout] 148 |                 (x > start || x < end)
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/main.rs:58:17
[INFO] [stdout]    |
[INFO] [stdout] 58 |             Err(e) => {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nic`
[INFO] [stdout]    --> src/tcp.rs:155:9
[INFO] [stdout]     |
[INFO] [stdout] 155 |         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:156:9
[INFO] [stdout]     |
[INFO] [stdout] 156 |         iph: etherparse::Ipv4HeaderSlice<'a>, 
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_iph`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:45:43
[INFO] [stdout]    |
[INFO] [stdout] 45 | ...                   Entry::Vacant(mut e) =...
[INFO] [stdout]    |                                     ----^
[INFO] [stdout]    |                                     |
[INFO] [stdout]    |                                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Estab`
[INFO] [stdout]  --> src/tcp.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Estab,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `up`
[INFO] [stdout]   --> src/tcp.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     up: bool,       // send urgent pointer
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `wl1`
[INFO] [stdout]   --> src/tcp.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     wl1: u32,     // segment sequence number used for last window update
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `wl2`
[INFO] [stdout]   --> src/tcp.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 45 |     wl2: u32,     // segment acknowledgement number used for last window update 
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `up`
[INFO] [stdout]   --> src/tcp.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     up: bool,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `irs`
[INFO] [stdout]   --> src/tcp.rs:67:5
[INFO] [stdout]    |
[INFO] [stdout] 67 |     irs: u32,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |         c.ip.set_payload_len(syn_ack.header_len() as usize);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |             c.ip.write(&mut unwritten);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:131:13
[INFO] [stdout]     |
[INFO] [stdout] 131 |             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] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/tcp.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |         nic.send(&buf[..unwritten]);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "8a4c548d9ac457857cea096688e169cdc0cd8247b5375657b54d35869c883946", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a4c548d9ac457857cea096688e169cdc0cd8247b5375657b54d35869c883946", kill_on_drop: false }`
[INFO] [stdout] 8a4c548d9ac457857cea096688e169cdc0cd8247b5375657b54d35869c883946
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a0678567d53b145e43960a0a682d157a6a19b825e648f9a57637f017b6bf9166
[INFO] running `Command { std: "docker" "start" "-a" "a0678567d53b145e43960a0a682d157a6a19b825e648f9a57637f017b6bf9166", kill_on_drop: false }`
[INFO] [stderr] warning: the item `Ord` is imported redundantly
[INFO] [stderr]    --> src/tcp.rs:139:24
[INFO] [stderr]     |
[INFO] [stderr] 139 |         use std::cmp::{Ord,Ordering};
[INFO] [stderr]     |                        ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/tcp.rs:145:17
[INFO] [stderr]     |
[INFO] [stderr] 145 |                 (start < x && x < end)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/tcp.rs:148:17
[INFO] [stderr]     |
[INFO] [stderr] 148 |                 (x > start || x < end)
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/main.rs:58:17
[INFO] [stderr]    |
[INFO] [stderr] 58 |             Err(e) => {
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `nic`
[INFO] [stderr]    --> src/tcp.rs:155:9
[INFO] [stderr]     |
[INFO] [stderr] 155 |         nic: &mut tun_tap::Iface,
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_nic`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `iph`
[INFO] [stderr]    --> src/tcp.rs:156:9
[INFO] [stderr]     |
[INFO] [stderr] 156 |         iph: etherparse::Ipv4HeaderSlice<'a>, 
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_iph`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:45:43
[INFO] [stderr]    |
[INFO] [stderr] 45 | ...                   Entry::Vacant(mut e) =...
[INFO] [stderr]    |                                     ----^
[INFO] [stderr]    |                                     |
[INFO] [stderr]    |                                     help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Estab`
[INFO] [stderr]  --> src/tcp.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     Estab,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `up`
[INFO] [stderr]   --> src/tcp.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     up: bool,       // send urgent pointer
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `wl1`
[INFO] [stderr]   --> src/tcp.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     wl1: u32,     // segment sequence number used for last window update
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `wl2`
[INFO] [stderr]   --> src/tcp.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 |     wl2: u32,     // segment acknowledgement number used for last window update 
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `up`
[INFO] [stderr]   --> src/tcp.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     up: bool,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `irs`
[INFO] [stderr]   --> src/tcp.rs:67:5
[INFO] [stderr]    |
[INFO] [stderr] 67 |     irs: u32,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/tcp.rs:126:9
[INFO] [stderr]     |
[INFO] [stderr] 126 |         c.ip.set_payload_len(syn_ack.header_len() as usize);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/tcp.rs:130:13
[INFO] [stderr]     |
[INFO] [stderr] 130 |             c.ip.write(&mut unwritten);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/tcp.rs:131:13
[INFO] [stderr]     |
[INFO] [stderr] 131 |             syn_ack.write(&mut unwritten);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/tcp.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |         nic.send(&buf[..unwritten]);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 17 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/tcp_rust-7e37b96b1a12a4ef
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a0678567d53b145e43960a0a682d157a6a19b825e648f9a57637f017b6bf9166", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0678567d53b145e43960a0a682d157a6a19b825e648f9a57637f017b6bf9166", kill_on_drop: false }`
[INFO] [stdout] a0678567d53b145e43960a0a682d157a6a19b825e648f9a57637f017b6bf9166