[INFO] cloning repository https://github.com/jsimmons/concurrency
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jsimmons/concurrency" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsimmons%2Fconcurrency", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsimmons%2Fconcurrency'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0bddc198fbfc1f6fdd45249b8c2c65f3c99fe59b
[INFO] checking jsimmons/concurrency against try#15a786332e2f0dd343b226ab6bb8ec028a350f73 for pr-81782
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjsimmons%2Fconcurrency" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jsimmons/concurrency on toolchain 15a786332e2f0dd343b226ab6bb8ec028a350f73
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jsimmons/concurrency
[INFO] finished tweaking git repo https://github.com/jsimmons/concurrency
[INFO] tweaked toml for git repo https://github.com/jsimmons/concurrency written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/jsimmons/concurrency already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9a4dabe1ff0f07e49fc6d1d8dff25ab86abfbebc572e693ea34eff12e14ceea7
[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" "9a4dabe1ff0f07e49fc6d1d8dff25ab86abfbebc572e693ea34eff12e14ceea7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a4dabe1ff0f07e49fc6d1d8dff25ab86abfbebc572e693ea34eff12e14ceea7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a4dabe1ff0f07e49fc6d1d8dff25ab86abfbebc572e693ea34eff12e14ceea7", kill_on_drop: false }`
[INFO] [stdout] 9a4dabe1ff0f07e49fc6d1d8dff25ab86abfbebc572e693ea34eff12e14ceea7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+15a786332e2f0dd343b226ab6bb8ec028a350f73" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d3937032188ac6aeb274214382f556c85757566a4b5f5649ec2781a2f9e3624
[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" "3d3937032188ac6aeb274214382f556c85757566a4b5f5649ec2781a2f9e3624", kill_on_drop: false }`
[INFO] [stderr]     Checking concurrency v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/main.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(num_fast: usize, num_slow: usize) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/main.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn new(num_fast: usize, num_slow: usize) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "3d3937032188ac6aeb274214382f556c85757566a4b5f5649ec2781a2f9e3624", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d3937032188ac6aeb274214382f556c85757566a4b5f5649ec2781a2f9e3624", kill_on_drop: false }`
[INFO] [stdout] 3d3937032188ac6aeb274214382f556c85757566a4b5f5649ec2781a2f9e3624