[INFO] cloning repository https://github.com/twaters/mq_arbiter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/twaters/mq_arbiter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwaters%2Fmq_arbiter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwaters%2Fmq_arbiter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 87dbdd56c40c40176561cb80f1109009300ef7dc
[INFO] checking twaters/mq_arbiter against master#36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923 for pr-81863
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwaters%2Fmq_arbiter" "/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/twaters/mq_arbiter on toolchain 36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/twaters/mq_arbiter
[INFO] finished tweaking git repo https://github.com/twaters/mq_arbiter
[INFO] tweaked toml for git repo https://github.com/twaters/mq_arbiter written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/twaters/mq_arbiter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "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" "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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0430297556aeb21e0e3683b4702418d0e39aa64bf034c6a99feaa31694e017f3
[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" "0430297556aeb21e0e3683b4702418d0e39aa64bf034c6a99feaa31694e017f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0430297556aeb21e0e3683b4702418d0e39aa64bf034c6a99feaa31694e017f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0430297556aeb21e0e3683b4702418d0e39aa64bf034c6a99feaa31694e017f3", kill_on_drop: false }`
[INFO] [stdout] 0430297556aeb21e0e3683b4702418d0e39aa64bf034c6a99feaa31694e017f3
[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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+36ecbc94eb6be90bc38b2d0fdd4bfac3f34d9923" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b22691dd702cfb479f34a6934a610ad96d5409947e368efbb4a0f572ea02f353
[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" "b22691dd702cfb479f34a6934a610ad96d5409947e368efbb4a0f572ea02f353", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling zmq v0.9.2
[INFO] [stderr]    Compiling metadeps v1.1.2
[INFO] [stderr]    Compiling zmq-sys v0.11.0
[INFO] [stderr]     Checking arbiter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated associated function `zmq::Message::from_slice`: Use the `From` trait instead.
[INFO] [stdout]    --> src/main.rs:214:15
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let state = zmq::Message::from_slice(i.to_string().as_bytes());
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/main.rs:55:22
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn is_checksum_valid(message: &Vec<zmq::Message>) -> bool {
[INFO] [stdout]    |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `registration_message`
[INFO] [stdout]    --> src/main.rs:103:38
[INFO] [stdout]     |
[INFO] [stdout] 103 | ...y_name : &str, registration_message : &zmq::Message, children : &mut HashMap<String, zmq::Socket>, ctx : &zmq::Context) {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_registration_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `checksum`
[INFO] [stdout]    --> src/main.rs:186:8
[INFO] [stdout]     |
[INFO] [stdout] 186 |             let checksum = message.swap_remove(7);
[INFO] [stdout]     |                 ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_checksum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `zmq::Message::from_slice`: Use the `From` trait instead.
[INFO] [stdout]    --> src/main.rs:214:15
[INFO] [stdout]     |
[INFO] [stdout] 214 |         let state = zmq::Message::from_slice(i.to_string().as_bytes());
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/main.rs:55:22
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn is_checksum_valid(message: &Vec<zmq::Message>) -> bool {
[INFO] [stdout]    |                      ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `registration_message`
[INFO] [stdout]    --> src/main.rs:103:38
[INFO] [stdout]     |
[INFO] [stdout] 103 | ...y_name : &str, registration_message : &zmq::Message, children : &mut HashMap<String, zmq::Socket>, ctx : &zmq::Context) {
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_registration_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `checksum`
[INFO] [stdout]    --> src/main.rs:186:8
[INFO] [stdout]     |
[INFO] [stdout] 186 |             let checksum = message.swap_remove(7);
[INFO] [stdout]     |                 ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_checksum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.28s
[INFO] running `Command { std: "docker" "inspect" "b22691dd702cfb479f34a6934a610ad96d5409947e368efbb4a0f572ea02f353", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b22691dd702cfb479f34a6934a610ad96d5409947e368efbb4a0f572ea02f353", kill_on_drop: false }`
[INFO] [stdout] b22691dd702cfb479f34a6934a610ad96d5409947e368efbb4a0f572ea02f353