[INFO] fetching crate shakmaty-syzygy 0.13.1...
[INFO] checking shakmaty-syzygy-0.13.1 against beta for pr-78714
[INFO] extracting crate shakmaty-syzygy 0.13.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate shakmaty-syzygy 0.13.1 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 shakmaty-syzygy 0.13.1
[INFO] finished tweaking crates.io crate shakmaty-syzygy 0.13.1
[INFO] tweaked toml for crates.io crate shakmaty-syzygy 0.13.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate shakmaty-syzygy 0.13.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] d77a5c81c0ba5f4f8f1358224467e7496db1fb1957ec68ba11be649bac7b0591
[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" "d77a5c81c0ba5f4f8f1358224467e7496db1fb1957ec68ba11be649bac7b0591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d77a5c81c0ba5f4f8f1358224467e7496db1fb1957ec68ba11be649bac7b0591", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d77a5c81c0ba5f4f8f1358224467e7496db1fb1957ec68ba11be649bac7b0591", kill_on_drop: false }`
[INFO] [stdout] d77a5c81c0ba5f4f8f1358224467e7496db1fb1957ec68ba11be649bac7b0591
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 754ad0c8eee8bbebfa2ce66293225e05782cd2cdedf7a7642e5c3258fd342a55
[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" "754ad0c8eee8bbebfa2ce66293225e05782cd2cdedf7a7642e5c3258fd342a55", kill_on_drop: false }`
[INFO] [stderr]    Compiling shakmaty v0.16.3
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]     Checking btoi v0.4.2
[INFO] [stderr]     Checking positioned-io-preview v0.3.3
[INFO] [stderr]     Checking bstr v0.2.12
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling structopt-derive v0.4.5
[INFO] [stderr]     Checking shakmaty-syzygy v0.13.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking structopt v0.3.12
[INFO] [stdout] error[E0432]: unresolved import `matches`
[INFO] [stdout]  --> benches/benches.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use matches::assert_matches;
[INFO] [stdout]   |     ^^^^^^^ use of undeclared crate or module `matches`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stdout]   --> benches/benches.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         assert_matches!(tb.probe_wdl(black_box(&pos)), Ok(Wdl::BlessedLoss));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `black_box`
[INFO] [stdout]  --> benches/benches.rs:1:57
[INFO] [stdout]   |
[INFO] [stdout] 1 | use bencher::{Bencher, benchmark_group, benchmark_main, black_box};
[INFO] [stdout]   |                                                         ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Wdl`
[INFO] [stdout]  --> benches/benches.rs:6:34
[INFO] [stdout]   |
[INFO] [stdout] 6 | use shakmaty_syzygy::{Tablebase, Wdl};
[INFO] [stdout]   |                                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shakmaty-syzygy`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "754ad0c8eee8bbebfa2ce66293225e05782cd2cdedf7a7642e5c3258fd342a55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "754ad0c8eee8bbebfa2ce66293225e05782cd2cdedf7a7642e5c3258fd342a55", kill_on_drop: false }`
[INFO] [stdout] 754ad0c8eee8bbebfa2ce66293225e05782cd2cdedf7a7642e5c3258fd342a55