[INFO] cloning repository https://github.com/golddranks/dokidoki
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/golddranks/dokidoki" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgolddranks%2Fdokidoki", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgolddranks%2Fdokidoki'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3b615ca68ec9a1140ce3404041983d0dbbb974de
[INFO] checking golddranks/dokidoki against try#e622d8d7bed4f2668d446e06c6c1436ecae15796 for pr-156776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgolddranks%2Fdokidoki" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/golddranks/dokidoki
[INFO] finished tweaking git repo https://github.com/golddranks/dokidoki
[INFO] tweaked toml for git repo https://github.com/golddranks/dokidoki written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/golddranks/dokidoki on toolchain e622d8d7bed4f2668d446e06c6c1436ecae15796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/golddranks/dokidoki 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" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pnet_macros_support v0.34.0
[INFO] [stderr]   Downloaded pnet_sys v0.34.0
[INFO] [stderr]   Downloaded pnet v0.34.0
[INFO] [stderr]   Downloaded pnet_packet v0.34.0
[INFO] [stderr]   Downloaded pnet_transport v0.34.0
[INFO] [stderr]   Downloaded serde_derive v1.0.187
[INFO] [stderr]   Downloaded pnet_base v0.34.0
[INFO] [stderr]   Downloaded argh_shared v0.1.12
[INFO] [stderr]   Downloaded pnet_macros v0.34.0
[INFO] [stderr]   Downloaded argh v0.1.12
[INFO] [stderr]   Downloaded argh_derive v0.1.12
[INFO] [stderr]   Downloaded pnet_datalink v0.34.0
[INFO] [stderr]   Downloaded serde v1.0.187
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7dd5584f4fbc776097c5b561cbe02dd2872ec358ddb9023f97cb862774cad26
[INFO] running `Command { std: "docker" "start" "-a" "a7dd5584f4fbc776097c5b561cbe02dd2872ec358ddb9023f97cb862774cad26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7dd5584f4fbc776097c5b561cbe02dd2872ec358ddb9023f97cb862774cad26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7dd5584f4fbc776097c5b561cbe02dd2872ec358ddb9023f97cb862774cad26", kill_on_drop: false }`
[INFO] [stdout] a7dd5584f4fbc776097c5b561cbe02dd2872ec358ddb9023f97cb862774cad26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+e622d8d7bed4f2668d446e06c6c1436ecae15796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ad5020aee9e674702f5243dc33c33e6546a78ccefb8a09e94303e071baadb1f6
[INFO] running `Command { std: "docker" "start" "-a" "ad5020aee9e674702f5243dc33c33e6546a78ccefb8a09e94303e071baadb1f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.66
[INFO] [stderr]    Compiling unicode-ident v1.0.11
[INFO] [stderr]    Compiling serde v1.0.187
[INFO] [stderr]     Checking no-std-net v0.6.0
[INFO] [stderr]    Compiling regex-syntax v0.7.4
[INFO] [stderr]    Compiling libc v0.2.147
[INFO] [stderr]    Compiling pnet v0.34.0
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking pnet_base v0.34.0
[INFO] [stderr]     Checking pnet_macros_support v0.34.0
[INFO] [stderr]    Compiling aho-corasick v1.0.4
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.29
[INFO] [stderr]     Checking pnet_sys v0.34.0
[INFO] [stderr]    Compiling regex-automata v0.3.6
[INFO] [stderr]    Compiling serde_derive v1.0.187
[INFO] [stderr]    Compiling regex v1.9.3
[INFO] [stderr]    Compiling pnet_macros v0.34.0
[INFO] [stderr]     Checking pnet_packet v0.34.0
[INFO] [stderr]     Checking pnet_transport v0.34.0
[INFO] [stderr]     Checking ipnetwork v0.20.0
[INFO] [stderr]     Checking argh_shared v0.1.12
[INFO] [stderr]     Checking pnet_datalink v0.34.0
[INFO] [stderr]    Compiling argh_derive v0.1.12
[INFO] [stderr]     Checking argh v0.1.12
[INFO] [stderr]     Checking dokidoki v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `str::from_utf8`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     str::from_utf8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `str::from_utf8`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     str::from_utf8,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TransportReceiver` and `self`
[INFO] [stdout]   --> src/main.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 |     packet::{ip::IpNextHeaderProtocols, udp::{self, UdpPacket}, Packet},
[INFO] [stdout]    |                                               ^^^^
[INFO] [stdout] 12 |     transport::{transport_channel, udp_packet_iter, TransportChannelType, TransportProtocol, TransportSender, TransportReceiver, Udp...
[INFO] [stdout]    |                                                                                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TransportReceiver` and `self`
[INFO] [stdout]   --> src/main.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 |     packet::{ip::IpNextHeaderProtocols, udp::{self, UdpPacket}, Packet},
[INFO] [stdout]    |                                               ^^^^
[INFO] [stdout] 12 |     transport::{transport_channel, udp_packet_iter, TransportChannelType, TransportProtocol, TransportSender, TransportReceiver, Udp...
[INFO] [stdout]    |                                                                                                               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:259:5
[INFO] [stdout]     |
[INFO] [stdout] 251 | /     loop {
[INFO] [stdout] 252 | |         match logic(&mut state, Io::time()) {
[INFO] [stdout] 253 | |             IoOp::Log(msg) => io.log(msg),
[INFO] [stdout] 254 | |             IoOp::Resolve(dns, target) => *target = Io::resolve(dns).ok(),
[INFO] [stdout] ...   |
[INFO] [stdout] 258 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 259 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/main.rs:259:5
[INFO] [stdout]     |
[INFO] [stdout] 251 | /     loop {
[INFO] [stdout] 252 | |         match logic(&mut state, Io::time()) {
[INFO] [stdout] 253 | |             IoOp::Log(msg) => io.log(msg),
[INFO] [stdout] 254 | |             IoOp::Resolve(dns, target) => *target = Io::resolve(dns).ok(),
[INFO] [stdout] ...   |
[INFO] [stdout] 258 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 259 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Packet`
[INFO] [stdout]   --> src/main.rs:11:65
[INFO] [stdout]    |
[INFO] [stdout] 11 |     packet::{ip::IpNextHeaderProtocols, udp::{self, UdpPacket}, Packet},
[INFO] [stdout]    |                                                                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Packet`
[INFO] [stdout]   --> src/main.rs:11:65
[INFO] [stdout]    |
[INFO] [stdout] 11 |     packet::{ip::IpNextHeaderProtocols, udp::{self, UdpPacket}, Packet},
[INFO] [stdout]    |                                                                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> src/main.rs:80:52
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn logic<'a, 'state>(state: &'a mut State<'state>, time: Instant) -> IoOp<'a, 'state> {
[INFO] [stdout]    |                                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `time`
[INFO] [stdout]   --> src/main.rs:80:52
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn logic<'a, 'state>(state: &'a mut State<'state>, time: Instant) -> IoOp<'a, 'state> {
[INFO] [stdout]    |                                                    ^^^^ help: if this is intentional, prefix it with an underscore: `_time`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target`
[INFO] [stdout]    --> src/main.rs:256:32
[INFO] [stdout]     |
[INFO] [stdout] 256 |             IoOp::Receive(dur, target) => { io.receive(dur); },
[INFO] [stdout]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_target`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DEF_MTU` is never used
[INFO] [stdout]   --> src/main.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | const DEF_MTU: usize = 1500;
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `target`
[INFO] [stdout]    --> src/main.rs:256:32
[INFO] [stdout]     |
[INFO] [stdout] 256 |             IoOp::Receive(dur, target) => { io.receive(dur); },
[INFO] [stdout]     |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_target`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Log`, `Resolve`, and `Send` are never constructed
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | enum IoOp<'a, 'state> {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 86 |     Log(LogMsg),
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 87 |     Resolve(&'a str, &'a mut Option<SocketAddr>),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 88 |     Send(u8),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IoOp` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DEF_MTU` is never used
[INFO] [stdout]   --> src/main.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | const DEF_MTU: usize = 1500;
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `peers`, `my_iface`, and `my_addr` are never read
[INFO] [stdout]   --> src/main.rs:94:5
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct State<'state> {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 94 |     peers: Vec<Peer>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 95 |     my_iface: NetworkInterface,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 96 |     my_addr: IpAddr,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `State` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Log`, `Resolve`, and `Send` are never constructed
[INFO] [stdout]   --> src/main.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 85 | enum IoOp<'a, 'state> {
[INFO] [stdout]    |      ---- variants in this enum
[INFO] [stdout] 86 |     Log(LogMsg),
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 87 |     Resolve(&'a str, &'a mut Option<SocketAddr>),
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 88 |     Send(u8),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `IoOp` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sx` is never read
[INFO] [stdout]    --> src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Io<'a> {
[INFO] [stdout]     |        -- field in this struct
[INFO] [stdout] 101 |     sx: TransportSender,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `peers`, `my_iface`, and `my_addr` are never read
[INFO] [stdout]   --> src/main.rs:94:5
[INFO] [stdout]    |
[INFO] [stdout] 93 | struct State<'state> {
[INFO] [stdout]    |        ----- fields in this struct
[INFO] [stdout] 94 |     peers: Vec<Peer>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 95 |     my_iface: NetworkInterface,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 96 |     my_addr: IpAddr,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `State` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `SentRequest`, `ReceivedRequest`, `SentResponse`, `ReceivedResponse`, and `ResolvedDns` are never constructed
[INFO] [stdout]    --> src/main.rs:177:5
[INFO] [stdout]     |
[INFO] [stdout] 176 | enum LogMsg {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 177 |     SentRequest(),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 178 |     ReceivedRequest(),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 179 |     SentResponse(),
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 180 |     ReceivedResponse(),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 181 |     ResolvedDns(),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `LogMsg` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `sx` is never read
[INFO] [stdout]    --> src/main.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Io<'a> {
[INFO] [stdout]     |        -- field in this struct
[INFO] [stdout] 101 |     sx: TransportSender,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `dns` and `addr` are never read
[INFO] [stdout]    --> src/main.rs:202:5
[INFO] [stdout]     |
[INFO] [stdout] 201 | struct Peer {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 202 |     dns: Option<String>,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 203 |     addr: Option<SocketAddr>,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Peer` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `SentRequest`, `ReceivedRequest`, `SentResponse`, `ReceivedResponse`, and `ResolvedDns` are never constructed
[INFO] [stdout]    --> src/main.rs:177:5
[INFO] [stdout]     |
[INFO] [stdout] 176 | enum LogMsg {
[INFO] [stdout]     |      ------ variants in this enum
[INFO] [stdout] 177 |     SentRequest(),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 178 |     ReceivedRequest(),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 179 |     SentResponse(),
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 180 |     ReceivedResponse(),
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 181 |     ResolvedDns(),
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `LogMsg` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `dns` and `addr` are never read
[INFO] [stdout]    --> src/main.rs:202:5
[INFO] [stdout]     |
[INFO] [stdout] 201 | struct Peer {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 202 |     dns: Option<String>,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 203 |     addr: Option<SocketAddr>,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Peer` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:256:45
[INFO] [stdout]     |
[INFO] [stdout] 256 |             IoOp::Receive(dur, target) => { io.receive(dur); },
[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] 256 |             IoOp::Receive(dur, target) => { let _ = io.receive(dur); },
[INFO] [stdout]     |                                             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:256:45
[INFO] [stdout]     |
[INFO] [stdout] 256 |             IoOp::Receive(dur, target) => { io.receive(dur); },
[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] 256 |             IoOp::Receive(dur, target) => { let _ = io.receive(dur); },
[INFO] [stdout]     |                                             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.79s
[INFO] running `Command { std: "docker" "inspect" "ad5020aee9e674702f5243dc33c33e6546a78ccefb8a09e94303e071baadb1f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad5020aee9e674702f5243dc33c33e6546a78ccefb8a09e94303e071baadb1f6", kill_on_drop: false }`
[INFO] [stdout] ad5020aee9e674702f5243dc33c33e6546a78ccefb8a09e94303e071baadb1f6
