[INFO] cloning repository https://github.com/sourcepirate/covert_tcp
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sourcepirate/covert_tcp" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsourcepirate%2Fcovert_tcp", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsourcepirate%2Fcovert_tcp'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] af27373d3c5f086d7c0e10a57d93615fcf992dfd
[INFO] testing sourcepirate/covert_tcp against 1.75.0 for beta-1.76-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsourcepirate%2Fcovert_tcp" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sourcepirate/covert_tcp on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sourcepirate/covert_tcp
[INFO] finished tweaking git repo https://github.com/sourcepirate/covert_tcp
[INFO] tweaked toml for git repo https://github.com/sourcepirate/covert_tcp written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sourcepirate/covert_tcp 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pnet_sys v0.21.0
[INFO] [stderr]   Downloaded winapi-util v0.1.1
[INFO] [stderr]   Downloaded ipnetwork v0.12.8
[INFO] [stderr]   Downloaded pnet_datalink v0.21.0
[INFO] [stderr]   Downloaded pnet_base v0.21.0
[INFO] [stderr]   Downloaded quote v0.6.9
[INFO] [stderr]   Downloaded syntex_errors v0.42.0
[INFO] [stderr]   Downloaded unicode-xid v0.0.3
[INFO] [stderr]   Downloaded pnet_macros v0.21.0
[INFO] [stderr]   Downloaded regex-syntax v0.5.6
[INFO] [stderr]   Downloaded regex v0.2.11
[INFO] [stderr]   Downloaded syn v0.15.18
[INFO] [stderr]   Downloaded syntex_syntax v0.42.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.2
[INFO] [stderr]   Downloaded regex v1.0.5
[INFO] [stderr]   Downloaded bitflags v0.5.0
[INFO] [stderr]   Downloaded serde v1.0.80
[INFO] [stderr]   Downloaded term v0.4.6
[INFO] [stderr]   Downloaded serde_derive v1.0.80
[INFO] [stderr]   Downloaded pnet_packet v0.21.0
[INFO] [stderr]   Downloaded docopt v1.0.2
[INFO] [stderr]   Downloaded aho-corasick v0.6.9
[INFO] [stderr]   Downloaded pnet v0.21.0
[INFO] [stderr]   Downloaded humantime v1.1.1
[INFO] [stderr]   Downloaded pnet_macros_support v0.21.0
[INFO] [stderr]   Downloaded syntex_pos v0.42.0
[INFO] [stderr]   Downloaded syntex v0.42.2
[INFO] [stderr]   Downloaded proc-macro2 v0.4.20
[INFO] [stderr]   Downloaded pnet_transport v0.21.0
[INFO] [stderr]   Downloaded memchr v2.1.1
[INFO] [stderr]   Downloaded ucd-util v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3e98628a2d80629e22ebef81779f7650ddb471cb270b2b520c23eaf9f15cdfe6
[INFO] running `Command { std: "docker" "start" "-a" "3e98628a2d80629e22ebef81779f7650ddb471cb270b2b520c23eaf9f15cdfe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3e98628a2d80629e22ebef81779f7650ddb471cb270b2b520c23eaf9f15cdfe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e98628a2d80629e22ebef81779f7650ddb471cb270b2b520c23eaf9f15cdfe6", kill_on_drop: false }`
[INFO] [stdout] 3e98628a2d80629e22ebef81779f7650ddb471cb270b2b520c23eaf9f15cdfe6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 988bbb62a3d8dcfc8736fe6364717ac9a41219c8b461a4484509170591ec76d1
[INFO] running `Command { std: "docker" "start" "-a" "988bbb62a3d8dcfc8736fe6364717ac9a41219c8b461a4484509170591ec76d1", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.1.1
[INFO] [stderr]    Compiling ucd-util v0.1.2
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling utf8-ranges v1.0.2
[INFO] [stderr]    Compiling term v0.4.6
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling bitflags v0.5.0
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling proc-macro2 v0.4.20
[INFO] [stderr]    Compiling pnet_base v0.21.0
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling glob v0.2.11
[INFO] [stderr]    Compiling regex v1.0.5
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling pnet_sys v0.21.0
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling serde v1.0.80
[INFO] [stderr]    Compiling ipnetwork v0.12.8
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling pnet_macros_support v0.21.0
[INFO] [stderr]    Compiling regex-syntax v0.6.2
[INFO] [stderr]    Compiling pnet v0.21.0
[INFO] [stderr]    Compiling quick-error v1.2.2
[INFO] [stderr]    Compiling pnet_datalink v0.21.0
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling strsim v0.7.0
[INFO] [stderr]    Compiling humantime v1.1.1
[INFO] [stderr]    Compiling termcolor v1.0.4
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling quote v0.6.9
[INFO] [stderr]    Compiling syn v0.15.18
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]    Compiling syntex_pos v0.42.0
[INFO] [stderr]    Compiling syntex_errors v0.42.0
[INFO] [stderr]    Compiling syntex_syntax v0.42.0
[INFO] [stderr]    Compiling serde_derive v1.0.80
[INFO] [stderr]    Compiling docopt v1.0.2
[INFO] [stderr]    Compiling syntex v0.42.2
[INFO] [stderr]    Compiling pnet_macros v0.21.0
[INFO] [stderr]    Compiling pnet_packet v0.21.0
[INFO] [stderr]    Compiling pnet_transport v0.21.0
[INFO] [stderr]    Compiling covert_tcp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/packet.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |         /// Building an IPV4 packet.
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 67 |         let mut ipv4_packet = MutableIpv4Packet::new(&mut buffer).unwrap();
[INFO] [stdout]    |         ------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/packet.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |           /// Building an TCP packet
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 79 | /         {
[INFO] [stdout] 80 | |             let mut tcp_packet = MutableTcpPacket::new(ipv4_packet.payload_mut()).unwrap();
[INFO] [stdout] 81 | |             let tcp_header_len = match MutableTcpPacket::minimum_packet_size().checked_div(4) {
[INFO] [stdout] 82 | |                 Some(l) => l as u8,
[INFO] [stdout] ...  |
[INFO] [stdout] 91 | |             tcp_packet.set_checksum(checksum);
[INFO] [stdout] 92 | |         };
[INFO] [stdout]    | |_________- rustdoc does not generate documentation for expressions
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `EtherTypes`
[INFO] [stdout]  --> src/sniffer.rs:3:30
[INFO] [stdout]   |
[INFO] [stdout] 3 | use pnet::packet::ethernet::{EtherTypes, EthernetPacket, MutableEthernetPacket};
[INFO] [stdout]   |                              ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::icmpv6::Icmpv6Packet`
[INFO] [stdout]  --> src/sniffer.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use pnet::packet::icmpv6::Icmpv6Packet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpNextHeaderProtocol`, `IpNextHeaderProtocols`
[INFO] [stdout]  --> src/sniffer.rs:5:24
[INFO] [stdout]   |
[INFO] [stdout] 5 | use pnet::packet::ip::{IpNextHeaderProtocol, IpNextHeaderProtocols};
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::ipv6::Ipv6Packet`
[INFO] [stdout]  --> src/sniffer.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use pnet::packet::ipv6::Ipv6Packet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::tcp::TcpPacket`
[INFO] [stdout]  --> src/sniffer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use pnet::packet::tcp::TcpPacket;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::util::MacAddr`
[INFO] [stdout]   --> src/sniffer.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use pnet::util::MacAddr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/sniffer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]   --> src/sniffer.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::net::IpAddr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/sniffer.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 62 | /         loop {
[INFO] [stdout] 63 | |             let mut buf: [u8; 1600] = [0u8; 1600];
[INFO] [stdout] 64 | |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stdout] 65 | |             match rx.next() {
[INFO] [stdout] ...  |
[INFO] [stdout] 70 | |             }
[INFO] [stdout] 71 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 72 |
[INFO] [stdout] 73 |           Ok(())
[INFO] [stdout]    |           ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/sniffer.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |             Err(e) => return Err(ReciverError::PacketError),
[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: `fake_ethernet_frame`
[INFO] [stdout]   --> src/sniffer.rs:64:21
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fake_ethernet_frame`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/sniffer.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut relative_path: PathBuf;
[INFO] [stdout]    |             ----^^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut file = File::open(relative_path).unwrap();
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `rx` is never read
[INFO] [stdout]   --> src/packet.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct CovertChannel {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] 16 |     tx: TransportSender,
[INFO] [stdout] 17 |     rx: TransportReceiver,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `packets` is never used
[INFO] [stdout]   --> src/packet.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl CovertChannel {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn packets(&mut self) -> Ipv4TransportChannelIterator {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `recv` is never used
[INFO] [stdout]   --> src/packet.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl CovertConnection {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     pub fn recv(&mut self) -> () {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |         sniff.recv();
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let _ = sniff.recv();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.36s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "988bbb62a3d8dcfc8736fe6364717ac9a41219c8b461a4484509170591ec76d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "988bbb62a3d8dcfc8736fe6364717ac9a41219c8b461a4484509170591ec76d1", kill_on_drop: false }`
[INFO] [stdout] 988bbb62a3d8dcfc8736fe6364717ac9a41219c8b461a4484509170591ec76d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ce993ec0d8ca6c0120f4abe5fc1ed17ec6a34a9d9937c676e4c826528cc9768
[INFO] running `Command { std: "docker" "start" "-a" "2ce993ec0d8ca6c0120f4abe5fc1ed17ec6a34a9d9937c676e4c826528cc9768", kill_on_drop: false }`
[INFO] [stderr]    Compiling covert_tcp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/packet.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |         /// Building an IPV4 packet.
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 67 |         let mut ipv4_packet = MutableIpv4Packet::new(&mut buffer).unwrap();
[INFO] [stdout]    |         ------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/packet.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |           /// Building an TCP packet
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 79 | /         {
[INFO] [stdout] 80 | |             let mut tcp_packet = MutableTcpPacket::new(ipv4_packet.payload_mut()).unwrap();
[INFO] [stdout] 81 | |             let tcp_header_len = match MutableTcpPacket::minimum_packet_size().checked_div(4) {
[INFO] [stdout] 82 | |                 Some(l) => l as u8,
[INFO] [stdout] ...  |
[INFO] [stdout] 91 | |             tcp_packet.set_checksum(checksum);
[INFO] [stdout] 92 | |         };
[INFO] [stdout]    | |_________- rustdoc does not generate documentation for expressions
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `EtherTypes`
[INFO] [stdout]  --> src/sniffer.rs:3:30
[INFO] [stdout]   |
[INFO] [stdout] 3 | use pnet::packet::ethernet::{EtherTypes, EthernetPacket, MutableEthernetPacket};
[INFO] [stdout]   |                              ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::icmpv6::Icmpv6Packet`
[INFO] [stdout]  --> src/sniffer.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use pnet::packet::icmpv6::Icmpv6Packet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpNextHeaderProtocol`, `IpNextHeaderProtocols`
[INFO] [stdout]  --> src/sniffer.rs:5:24
[INFO] [stdout]   |
[INFO] [stdout] 5 | use pnet::packet::ip::{IpNextHeaderProtocol, IpNextHeaderProtocols};
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::ipv6::Ipv6Packet`
[INFO] [stdout]  --> src/sniffer.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use pnet::packet::ipv6::Ipv6Packet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::packet::tcp::TcpPacket`
[INFO] [stdout]  --> src/sniffer.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use pnet::packet::tcp::TcpPacket;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `pnet::util::MacAddr`
[INFO] [stdout]   --> src/sniffer.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use pnet::util::MacAddr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]   --> src/sniffer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::io::Write;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::net::IpAddr`
[INFO] [stdout]   --> src/sniffer.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::net::IpAddr;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/sniffer.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 62 | /         loop {
[INFO] [stdout] 63 | |             let mut buf: [u8; 1600] = [0u8; 1600];
[INFO] [stdout] 64 | |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stdout] 65 | |             match rx.next() {
[INFO] [stdout] ...  |
[INFO] [stdout] 70 | |             }
[INFO] [stdout] 71 | |         }
[INFO] [stdout]    | |_________- any code following this expression is unreachable
[INFO] [stdout] 72 |
[INFO] [stdout] 73 |           Ok(())
[INFO] [stdout]    |           ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/sniffer.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |             Err(e) => return Err(ReciverError::PacketError),
[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: `fake_ethernet_frame`
[INFO] [stdout]   --> src/sniffer.rs:64:21
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fake_ethernet_frame`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/sniffer.rs:64:17
[INFO] [stdout]    |
[INFO] [stdout] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let mut relative_path: PathBuf;
[INFO] [stdout]    |             ----^^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:67:13
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut file = File::open(relative_path).unwrap();
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `rx` is never read
[INFO] [stdout]   --> src/packet.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct CovertChannel {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] 16 |     tx: TransportSender,
[INFO] [stdout] 17 |     rx: TransportReceiver,
[INFO] [stdout]    |     ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `packets` is never used
[INFO] [stdout]   --> src/packet.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl CovertChannel {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 36 |     pub fn packets(&mut self) -> Ipv4TransportChannelIterator {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `recv` is never used
[INFO] [stdout]   --> src/packet.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl CovertConnection {
[INFO] [stdout]    | --------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 97 |     pub fn recv(&mut self) -> () {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |         sniff.recv();
[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)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 97 |         let _ = sniff.recv();
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.53s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "2ce993ec0d8ca6c0120f4abe5fc1ed17ec6a34a9d9937c676e4c826528cc9768", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ce993ec0d8ca6c0120f4abe5fc1ed17ec6a34a9d9937c676e4c826528cc9768", kill_on_drop: false }`
[INFO] [stdout] 2ce993ec0d8ca6c0120f4abe5fc1ed17ec6a34a9d9937c676e4c826528cc9768
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d73dcb98859c199fd0d1c4d37d6ae5488cc9602b438155a8a17fd6cfe23492b9
[INFO] running `Command { std: "docker" "start" "-a" "d73dcb98859c199fd0d1c4d37d6ae5488cc9602b438155a8a17fd6cfe23492b9", kill_on_drop: false }`
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/packet.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |         /// Building an IPV4 packet.
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 67 |         let mut ipv4_packet = MutableIpv4Packet::new(&mut buffer).unwrap();
[INFO] [stderr]    |         ------------------------------------------------------------------- rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = help: use `//` for a plain comment
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/packet.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |           /// Building an TCP packet
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 79 | /         {
[INFO] [stderr] 80 | |             let mut tcp_packet = MutableTcpPacket::new(ipv4_packet.payload_mut()).unwrap();
[INFO] [stderr] 81 | |             let tcp_header_len = match MutableTcpPacket::minimum_packet_size().checked_div(4) {
[INFO] [stderr] 82 | |                 Some(l) => l as u8,
[INFO] [stderr] ...  |
[INFO] [stderr] 91 | |             tcp_packet.set_checksum(checksum);
[INFO] [stderr] 92 | |         };
[INFO] [stderr]    | |_________- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = help: use `//` for a plain comment
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `EtherTypes`
[INFO] [stderr]  --> src/sniffer.rs:3:30
[INFO] [stderr]   |
[INFO] [stderr] 3 | use pnet::packet::ethernet::{EtherTypes, EthernetPacket, MutableEthernetPacket};
[INFO] [stderr]   |                              ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pnet::packet::icmpv6::Icmpv6Packet`
[INFO] [stderr]  --> src/sniffer.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use pnet::packet::icmpv6::Icmpv6Packet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `IpNextHeaderProtocol`, `IpNextHeaderProtocols`
[INFO] [stderr]  --> src/sniffer.rs:5:24
[INFO] [stderr]   |
[INFO] [stderr] 5 | use pnet::packet::ip::{IpNextHeaderProtocol, IpNextHeaderProtocols};
[INFO] [stderr]   |                        ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pnet::packet::ipv6::Ipv6Packet`
[INFO] [stderr]  --> src/sniffer.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use pnet::packet::ipv6::Ipv6Packet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pnet::packet::tcp::TcpPacket`
[INFO] [stderr]  --> src/sniffer.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use pnet::packet::tcp::TcpPacket;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `pnet::util::MacAddr`
[INFO] [stderr]   --> src/sniffer.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use pnet::util::MacAddr;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]   --> src/sniffer.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 | use std::io::Write;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::net::IpAddr`
[INFO] [stderr]   --> src/sniffer.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use std::net::IpAddr;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]   --> src/sniffer.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 62 | /         loop {
[INFO] [stderr] 63 | |             let mut buf: [u8; 1600] = [0u8; 1600];
[INFO] [stderr] 64 | |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stderr] 65 | |             match rx.next() {
[INFO] [stderr] ...  |
[INFO] [stderr] 70 | |             }
[INFO] [stderr] 71 | |         }
[INFO] [stderr]    | |_________- any code following this expression is unreachable
[INFO] [stderr] 72 |
[INFO] [stderr] 73 |           Ok(())
[INFO] [stderr]    |           ^^^^^^ unreachable expression
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `e`
[INFO] [stderr]   --> src/sniffer.rs:59:17
[INFO] [stderr]    |
[INFO] [stderr] 59 |             Err(e) => return Err(ReciverError::PacketError),
[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: `fake_ethernet_frame`
[INFO] [stderr]   --> src/sniffer.rs:64:21
[INFO] [stderr]    |
[INFO] [stderr] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fake_ethernet_frame`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/sniffer.rs:64:17
[INFO] [stderr]    |
[INFO] [stderr] 64 |             let mut fake_ethernet_frame = MutableEthernetPacket::new(&mut buf[..]).unwrap();
[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: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:61:13
[INFO] [stderr]    |
[INFO] [stderr] 61 |         let mut relative_path: PathBuf;
[INFO] [stderr]    |             ----^^^^^^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |         let mut file = File::open(relative_path).unwrap();
[INFO] [stderr]    |             ----^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field `rx` is never read
[INFO] [stderr]   --> src/packet.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub struct CovertChannel {
[INFO] [stderr]    |            ------------- field in this struct
[INFO] [stderr] 16 |     tx: TransportSender,
[INFO] [stderr] 17 |     rx: TransportReceiver,
[INFO] [stderr]    |     ^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `packets` is never used
[INFO] [stderr]   --> src/packet.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 20 | impl CovertChannel {
[INFO] [stderr]    | ------------------ method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 36 |     pub fn packets(&mut self) -> Ipv4TransportChannelIterator {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `recv` is never used
[INFO] [stderr]   --> src/packet.rs:97:12
[INFO] [stderr]    |
[INFO] [stderr] 46 | impl CovertConnection {
[INFO] [stderr]    | --------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 97 |     pub fn recv(&mut self) -> () {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/main.rs:97:9
[INFO] [stderr]    |
[INFO] [stderr] 97 |         sniff.recv();
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 97 |         let _ = sniff.recv();
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `covert_tcp` (bin "covert_tcp" test) generated 20 warnings (run `cargo fix --bin "covert_tcp" --tests` to apply 13 suggestions)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/covert_tcp-0889f4dd4fc06bbc)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d73dcb98859c199fd0d1c4d37d6ae5488cc9602b438155a8a17fd6cfe23492b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d73dcb98859c199fd0d1c4d37d6ae5488cc9602b438155a8a17fd6cfe23492b9", kill_on_drop: false }`
[INFO] [stdout] d73dcb98859c199fd0d1c4d37d6ae5488cc9602b438155a8a17fd6cfe23492b9
