[INFO] fetching crate slacs-core 0.0.0...
[INFO] checking slacs-core-0.0.0 against try#32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d for pr-83312
[INFO] extracting crate slacs-core 0.0.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate slacs-core 0.0.0 on toolchain 32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v0.8.23
[INFO] [stderr]   Downloaded dtoa v0.2.2
[INFO] [stderr]   Downloaded crossbeam v0.2.12
[INFO] [stderr]   Downloaded itoa v0.1.1
[INFO] [stderr]   Downloaded serde v0.7.15
[INFO] [stderr]   Downloaded isatty v0.1.9
[INFO] [stderr]   Downloaded serde_json v0.7.4
[INFO] [stderr]   Downloaded ansi_term v0.7.5
[INFO] [stderr]   Downloaded bytecount v0.1.7
[INFO] [stderr]   Downloaded dbghelp-sys v0.2.0
[INFO] [stderr]   Downloaded backtrace-sys v0.1.37
[INFO] [stderr]   Downloaded slog-serde v0.7.0
[INFO] [stderr]   Downloaded chrono v0.2.25
[INFO] [stderr]   Downloaded backtrace v0.2.3
[INFO] [stderr]   Downloaded num v0.1.42
[INFO] [stderr]   Downloaded error-chain v0.2.2
[INFO] [stderr]   Downloaded xi-unicode v0.0.1
[INFO] [stderr]   Downloaded num-traits v0.1.43
[INFO] [stderr]   Downloaded xi-rope v0.1.1
[INFO] [stderr]   Downloaded slog-term v0.7.0
[INFO] [stderr]   Downloaded gapbuffer v0.1.1
[INFO] [stderr]   Downloaded slog v0.7.0
[INFO] [stderr]   Downloaded slog-json v0.7.0
[INFO] [stderr]   Downloaded serde_json v0.8.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 15b410ad17557a526ffd3e50265ae5322d61b4558b9a73401e1aff21ae5308a9
[INFO] running `Command { std: "docker" "start" "-a" "15b410ad17557a526ffd3e50265ae5322d61b4558b9a73401e1aff21ae5308a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15b410ad17557a526ffd3e50265ae5322d61b4558b9a73401e1aff21ae5308a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15b410ad17557a526ffd3e50265ae5322d61b4558b9a73401e1aff21ae5308a9", kill_on_drop: false }`
[INFO] [stdout] 15b410ad17557a526ffd3e50265ae5322d61b4558b9a73401e1aff21ae5308a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:4f92631de1aa59f8320307485d3b3c869a5c90ab1d76ce2cffab9807b8c9a1fb" "/opt/rustwide/cargo-home/bin/cargo" "+32cb8dc6fdc8140b91f4d17c4883e528db4e7e6d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f4bc263572fe37e4b152689f17d831d82ca4e18d4f7bd783675423d554319fc
[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" "9f4bc263572fe37e4b152689f17d831d82ca4e18d4f7bd783675423d554319fc", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]     Checking serde v0.7.15
[INFO] [stderr]     Checking itoa v0.1.1
[INFO] [stderr]     Checking bytecount v0.1.7
[INFO] [stderr]     Checking dtoa v0.2.2
[INFO] [stderr]     Checking ansi_term v0.7.5
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking xi-unicode v0.0.1
[INFO] [stderr]     Checking gapbuffer v0.1.1
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking xi-rope v0.1.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]     Checking error-chain v0.2.2
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking serde_json v0.7.4
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]     Checking serde_json v0.8.6
[INFO] [stderr]     Checking slog v0.7.0
[INFO] [stderr]     Checking slog-serde v0.7.0
[INFO] [stderr]     Checking slog-term 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 13.50s
[INFO] running `Command { std: "docker" "inspect" "9f4bc263572fe37e4b152689f17d831d82ca4e18d4f7bd783675423d554319fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f4bc263572fe37e4b152689f17d831d82ca4e18d4f7bd783675423d554319fc", kill_on_drop: false }`
[INFO] [stdout] 9f4bc263572fe37e4b152689f17d831d82ca4e18d4f7bd783675423d554319fc