[INFO] crate slacs-core 0.0.0 is already in cache
[INFO] checking slacs-core-0.0.0 against try#8a749131e7beb72f6edacefd2bdcbed3d67b2112 for pr-72331
[INFO] extracting crate slacs-core 0.0.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate slacs-core 0.0.0 on toolchain 8a749131e7beb72f6edacefd2bdcbed3d67b2112
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-12/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6b4dffc7af4b183bfeba73229a34f34a8beb5561cfea22de2c65d9fd7c8c8595
[INFO] running `"docker" "start" "-a" "6b4dffc7af4b183bfeba73229a34f34a8beb5561cfea22de2c65d9fd7c8c8595"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking crossbeam v0.2.12
[INFO] [stderr]     Checking itoa v0.1.1
[INFO] [stderr]     Checking bytecount v0.1.7
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking dtoa v0.2.2
[INFO] [stderr]     Checking gapbuffer v0.1.1
[INFO] [stderr]     Checking xi-unicode v0.0.1
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling dbghelp-sys v0.2.0
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking xi-rope v0.1.1
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[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 error-chain v0.2.2
[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] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/slacs/marks.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn new() -> MarkPosition {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cursor`
[INFO] [stderr]   --> src/slacs/marks.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     Cursor(usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DisplayMark`
[INFO] [stderr]   --> src/slacs/marks.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     DisplayMark(usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/slacs/marks.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn new() -> MarkPosition {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cursor`
[INFO] [stderr]   --> src/slacs/marks.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     Cursor(usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `DisplayMark`
[INFO] [stderr]   --> src/slacs/marks.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     DisplayMark(usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 20.50s
[INFO] running `"docker" "inspect" "6b4dffc7af4b183bfeba73229a34f34a8beb5561cfea22de2c65d9fd7c8c8595"`
[INFO] running `"docker" "rm" "-f" "6b4dffc7af4b183bfeba73229a34f34a8beb5561cfea22de2c65d9fd7c8c8595"`
[INFO] [stdout] 6b4dffc7af4b183bfeba73229a34f34a8beb5561cfea22de2c65d9fd7c8c8595