[INFO] fetching crate shakmaty-syzygy 0.13.1...
[INFO] checking shakmaty-syzygy-0.13.1 against master#ba72b15666b2491415aec703a02c2364fe5e2790 for pr-71140
[INFO] extracting crate shakmaty-syzygy 0.13.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate shakmaty-syzygy 0.13.1 on toolchain ba72b15666b2491415aec703a02c2364fe5e2790
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-7/source/Cargo.toml
[INFO] crate crates.io crate shakmaty-syzygy 0.13.1 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "+ba72b15666b2491415aec703a02c2364fe5e2790" "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] 6f4ab782b9953912ca6a950af09ef5fe129cbfbde83ef81f7c5b8230551dac20
[INFO] running `"docker" "start" "-a" "6f4ab782b9953912ca6a950af09ef5fe129cbfbde83ef81f7c5b8230551dac20"`
[INFO] [stderr]    Compiling shakmaty v0.16.3
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking positioned-io-preview v0.3.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.9
[INFO] [stderr]     Checking btoi v0.4.2
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking bstr v0.2.12
[INFO] [stderr]    Compiling quote v1.0.3
[INFO] [stderr]    Compiling syn v1.0.17
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking shakmaty-syzygy v0.13.1 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling structopt-derive v0.4.5
[INFO] [stderr]     Checking structopt v0.3.12
[INFO] [stderr] error[E0432]: unresolved import `matches`
[INFO] [stderr]  --> benches/benches.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use matches::assert_matches;
[INFO] [stderr]   |     ^^^^^^^ use of undeclared type or module `matches`
[INFO] [stderr] 
[INFO] [stderr] error: cannot determine resolution for the macro `assert_matches`
[INFO] [stderr]   --> benches/benches.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 |         assert_matches!(tb.probe_wdl(black_box(&pos)), Ok(Wdl::BlessedLoss));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: import resolution is stuck, try simplifying macro imports
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `black_box`
[INFO] [stderr]  --> benches/benches.rs:1:57
[INFO] [stderr]   |
[INFO] [stderr] 1 | use bencher::{Bencher, benchmark_group, benchmark_main, black_box};
[INFO] [stderr]   |                                                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Wdl`
[INFO] [stderr]  --> benches/benches.rs:6:34
[INFO] [stderr]   |
[INFO] [stderr] 6 | use shakmaty_syzygy::{Tablebase, Wdl};
[INFO] [stderr]   |                                  ^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[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 `"docker" "inspect" "6f4ab782b9953912ca6a950af09ef5fe129cbfbde83ef81f7c5b8230551dac20"`
[INFO] running `"docker" "rm" "-f" "6f4ab782b9953912ca6a950af09ef5fe129cbfbde83ef81f7c5b8230551dac20"`
[INFO] [stdout] 6f4ab782b9953912ca6a950af09ef5fe129cbfbde83ef81f7c5b8230551dac20