[INFO] cloning repository https://github.com/hjr3/future-mpsc-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hjr3/future-mpsc-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhjr3%2Ffuture-mpsc-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhjr3%2Ffuture-mpsc-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 88217f15cff0e029900e5d8820b55a8c5d7e4666
[INFO] checking hjr3/future-mpsc-example against master#7f5a42b073dc2bee2aa625052eb066ee07072048 for pr-78991
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhjr3%2Ffuture-mpsc-example" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hjr3/future-mpsc-example on toolchain 7f5a42b073dc2bee2aa625052eb066ee07072048
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hjr3/future-mpsc-example
[INFO] finished tweaking git repo https://github.com/hjr3/future-mpsc-example
[INFO] tweaked toml for git repo https://github.com/hjr3/future-mpsc-example written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/hjr3/future-mpsc-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "fetch" "--locked" "--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 futures v0.1.10
[INFO] [stderr]   Downloaded miow v0.2.0
[INFO] [stderr]   Downloaded mio v0.6.4
[INFO] [stderr]   Downloaded tokio-core v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bdec836eaf8cf8430dd388e60e8a8d307ef857b6782a707d490a950536732cea
[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" "bdec836eaf8cf8430dd388e60e8a8d307ef857b6782a707d490a950536732cea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bdec836eaf8cf8430dd388e60e8a8d307ef857b6782a707d490a950536732cea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bdec836eaf8cf8430dd388e60e8a8d307ef857b6782a707d490a950536732cea", kill_on_drop: false }`
[INFO] [stdout] bdec836eaf8cf8430dd388e60e8a8d307ef857b6782a707d490a950536732cea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+7f5a42b073dc2bee2aa625052eb066ee07072048" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 411342d21d4a2aa8fa3efda030e7018a534261b4be79f6c3133765733715aa18
[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" "411342d21d4a2aa8fa3efda030e7018a534261b4be79f6c3133765733715aa18", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.21
[INFO] [stderr]     Checking log v0.3.6
[INFO] [stderr]     Checking cfg-if v0.1.0
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking futures v0.1.10
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking thread-id v3.0.0
[INFO] [stderr]     Checking net2 v0.2.26
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]     Checking aho-corasick v0.6.2
[INFO] [stderr]     Checking mio v0.6.4
[INFO] [stderr]     Checking regex v0.2.1
[INFO] [stderr]     Checking tokio-core v0.1.4
[INFO] [stderr]     Checking env_logger v0.4.1
[INFO] [stderr]     Checking future-mpsc-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.55s
[INFO] running `Command { std: "docker" "inspect" "411342d21d4a2aa8fa3efda030e7018a534261b4be79f6c3133765733715aa18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "411342d21d4a2aa8fa3efda030e7018a534261b4be79f6c3133765733715aa18", kill_on_drop: false }`
[INFO] [stdout] 411342d21d4a2aa8fa3efda030e7018a534261b4be79f6c3133765733715aa18