[INFO] fetching crate slacs-core 0.0.0...
[INFO] checking slacs-core-0.0.0 against beta for pr-78714
[INFO] extracting crate slacs-core 0.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate slacs-core 0.0.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slacs-core 0.0.0
[INFO] finished tweaking crates.io crate slacs-core 0.0.0
[INFO] tweaked toml for crates.io crate slacs-core 0.0.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ffdd25a3203b157780ea0ad973694212f5f874cba1b358369da30f1d3f703e74
[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" "ffdd25a3203b157780ea0ad973694212f5f874cba1b358369da30f1d3f703e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffdd25a3203b157780ea0ad973694212f5f874cba1b358369da30f1d3f703e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffdd25a3203b157780ea0ad973694212f5f874cba1b358369da30f1d3f703e74", kill_on_drop: false }`
[INFO] [stdout] ffdd25a3203b157780ea0ad973694212f5f874cba1b358369da30f1d3f703e74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4cca5956e8e6207f0283a6b9568cd8d6f2c5e86c280048378bd68b56cb2cc861
[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" "4cca5956e8e6207f0283a6b9568cd8d6f2c5e86c280048378bd68b56cb2cc861", kill_on_drop: false }`
[INFO] [stderr]     Checking serde v0.7.15
[INFO] [stderr]     Checking strsim v0.5.2
[INFO] [stderr]     Checking bytecount v0.1.7
[INFO] [stderr]     Checking ansi_term v0.7.5
[INFO] [stderr]     Checking gapbuffer v0.1.1
[INFO] [stderr]     Checking xi-unicode v0.0.1
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking error-chain v0.2.2
[INFO] [stderr]     Checking xi-rope v0.1.1
[INFO] [stderr]     Checking slog v0.7.0
[INFO] [stderr]     Checking docopt v0.6.86
[INFO] [stderr]     Checking slog-term v0.7.0
[INFO] [stderr]     Checking serde_json v0.7.4
[INFO] [stderr]     Checking slog-serde v0.7.0
[INFO] [stderr]     Checking slog-json v0.7.0
[INFO] [stderr]     Checking slacs-core v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/slacs/marks.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn new() -> MarkPosition {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cursor`
[INFO] [stdout]   --> src/slacs/marks.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     Cursor(usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DisplayMark`
[INFO] [stdout]   --> src/slacs/marks.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     DisplayMark(usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/slacs/marks.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn new() -> MarkPosition {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cursor`
[INFO] [stdout]   --> src/slacs/marks.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     Cursor(usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `DisplayMark`
[INFO] [stdout]   --> src/slacs/marks.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     DisplayMark(usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.89s
[INFO] running `Command { std: "docker" "inspect" "4cca5956e8e6207f0283a6b9568cd8d6f2c5e86c280048378bd68b56cb2cc861", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4cca5956e8e6207f0283a6b9568cd8d6f2c5e86c280048378bd68b56cb2cc861", kill_on_drop: false }`
[INFO] [stdout] 4cca5956e8e6207f0283a6b9568cd8d6f2c5e86c280048378bd68b56cb2cc861