[INFO] fetching crate backtrack 0.3.0...
[INFO] testing backtrack-0.3.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate backtrack 0.3.0 into /workspace/builds/worker-35/source
[INFO] validating manifest of crates.io crate backtrack 0.3.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate backtrack 0.3.0
[INFO] finished tweaking crates.io crate backtrack 0.3.0
[INFO] tweaked toml for crates.io crate backtrack 0.3.0 written to /workspace/builds/worker-35/source/Cargo.toml
[INFO] crate crates.io crate backtrack 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4129039654c0c6e012dd63f5887710e9a513b0d08ebce9457072531f25775285
[INFO] running `Command { std: "docker" "start" "-a" "4129039654c0c6e012dd63f5887710e9a513b0d08ebce9457072531f25775285", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4129039654c0c6e012dd63f5887710e9a513b0d08ebce9457072531f25775285", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4129039654c0c6e012dd63f5887710e9a513b0d08ebce9457072531f25775285", kill_on_drop: false }`
[INFO] [stdout] 4129039654c0c6e012dd63f5887710e9a513b0d08ebce9457072531f25775285
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0fa70cbb547942286c9417b5d56fdfbaf93d32cea5b916202d06e53b24bb52c8
[INFO] running `Command { std: "docker" "start" "-a" "0fa70cbb547942286c9417b5d56fdfbaf93d32cea5b916202d06e53b24bb52c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling backtrack v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "0fa70cbb547942286c9417b5d56fdfbaf93d32cea5b916202d06e53b24bb52c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fa70cbb547942286c9417b5d56fdfbaf93d32cea5b916202d06e53b24bb52c8", kill_on_drop: false }`
[INFO] [stdout] 0fa70cbb547942286c9417b5d56fdfbaf93d32cea5b916202d06e53b24bb52c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d8d61ecb518fa56032a32b1b08ccb3d2c12d95896407908d8c776ccedaf0cb7d
[INFO] running `Command { std: "docker" "start" "-a" "d8d61ecb518fa56032a32b1b08ccb3d2c12d95896407908d8c776ccedaf0cb7d", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.3
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.4
[INFO] [stderr]    Compiling backtrack v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 28.02s
[INFO] running `Command { std: "docker" "inspect" "d8d61ecb518fa56032a32b1b08ccb3d2c12d95896407908d8c776ccedaf0cb7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d8d61ecb518fa56032a32b1b08ccb3d2c12d95896407908d8c776ccedaf0cb7d", kill_on_drop: false }`
[INFO] [stdout] d8d61ecb518fa56032a32b1b08ccb3d2c12d95896407908d8c776ccedaf0cb7d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-35/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=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 34870dd7136d7a48a24b9843a6237e5a4e614cfe5ad1927ba7723ae2550bb565
[INFO] running `Command { std: "docker" "start" "-a" "34870dd7136d7a48a24b9843a6237e5a4e614cfe5ad1927ba7723ae2550bb565", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.20s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/backtrack-9586351e5644d9de)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stderr]      Running tests/it/main.rs (/opt/rustwide/target/debug/deps/it-90f6de00ebad56c5)
[INFO] [stdout] test problems::total_sum::tests::sums_sat3 ... ok
[INFO] [stdout] test problems::count_up::tests::count_up_unsat ... ok
[INFO] [stdout] test problems::count_up::tests::count_up_sat ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_unsat_too_few ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_sat4 ... ok
[INFO] [stdout] test problems::total_sum::tests::sums_unsat_too_many ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 18 tests
[INFO] [stdout] test bit_queens::tiny_bit_at_least ... ok
[INFO] [stdout] test count_up::count_up_search_sat ... ok
[INFO] [stdout] test count_up::count_up_search_nosat ... ok
[INFO] [stdout] test n_queens::four_queens_search_nodes ... ok
[INFO] [stdout] test count_up::total_sum_unsat_unique ... ok
[INFO] [stdout] test zero_sized::zero_len_problem ... ok
[INFO] [stdout] test zero_sized::zero_sized_len_problem ... ok
[INFO] [stdout] test total_sum::total_sum_unsat_unique_cached ... ok
[INFO] [stdout] test n_queens::four_queens_search_sat ... ok
[INFO] [stdout] test total_sum::total_sum_unsat_unique ... ok
[INFO] [stdout] test total_sum::total_sum_search_sat_cached ... ok
[INFO] [stdout] test total_sum::total_sum_search_sat ... ok
[INFO] [stdout] test zero_sized::zero_sized_len_problem_cached ... ok
[INFO] [stdout] test zero_sized::zero_len_problem_cached ... ok
[INFO] [stdout] test n_queens::four_queens_unsat_unique ... ok
[INFO] [stdout] test zero_sized::zero_sized_problem ... ok
[INFO] [stdout] test zero_sized::zero_sized_problem_cached ... ok
[INFO] [stdout] test bit_queens::equivalent_n_queens ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.34s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests backtrack
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 23) ... ok
[INFO] [stdout] test src/lib.rs - (line 61) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.63s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "34870dd7136d7a48a24b9843a6237e5a4e614cfe5ad1927ba7723ae2550bb565", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34870dd7136d7a48a24b9843a6237e5a4e614cfe5ad1927ba7723ae2550bb565", kill_on_drop: false }`
[INFO] [stdout] 34870dd7136d7a48a24b9843a6237e5a4e614cfe5ad1927ba7723ae2550bb565