[INFO] cloning repository https://github.com/kokoro-a/polyomino-tiling
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kokoro-a/polyomino-tiling" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkokoro-a%2Fpolyomino-tiling", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkokoro-a%2Fpolyomino-tiling'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 71afc734ed138a0f7aa38859950b637d556d3752
[INFO] testing kokoro-a/polyomino-tiling against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkokoro-a%2Fpolyomino-tiling" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kokoro-a/polyomino-tiling
[INFO] finished tweaking git repo https://github.com/kokoro-a/polyomino-tiling
[INFO] tweaked toml for git repo https://github.com/kokoro-a/polyomino-tiling written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kokoro-a/polyomino-tiling on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kokoro-a/polyomino-tiling already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9231c5e80f2b24b847ccbd34880657f683f17468c42493f5feaac4d719c126fa
[INFO] running `Command { std: "docker" "start" "-a" "9231c5e80f2b24b847ccbd34880657f683f17468c42493f5feaac4d719c126fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9231c5e80f2b24b847ccbd34880657f683f17468c42493f5feaac4d719c126fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9231c5e80f2b24b847ccbd34880657f683f17468c42493f5feaac4d719c126fa", kill_on_drop: false }`
[INFO] [stdout] 9231c5e80f2b24b847ccbd34880657f683f17468c42493f5feaac4d719c126fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f947f2bcc0eb471d24f150494883f585aee9b0a8d2eb0dc755d99d83913bbbb6
[INFO] running `Command { std: "docker" "start" "-a" "f947f2bcc0eb471d24f150494883f585aee9b0a8d2eb0dc755d99d83913bbbb6", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.21
[INFO] [stderr]    Compiling regex-syntax v0.8.5
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling anstyle-query v1.1.2
[INFO] [stderr]    Compiling colorchoice v1.0.3
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling anstyle-parse v0.2.6
[INFO] [stderr]    Compiling anstyle v1.0.10
[INFO] [stderr]    Compiling jiff v0.2.14
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.100
[INFO] [stderr]    Compiling syn v2.0.101
[INFO] [stderr]    Compiling anstream v0.6.18
[INFO] [stderr]    Compiling regex-automata v0.4.9
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.100
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling regex v1.11.1
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.100
[INFO] [stderr]    Compiling env_filter v0.1.3
[INFO] [stderr]    Compiling env_logger v0.11.8
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.100
[INFO] [stderr]    Compiling wasm-bindgen v0.2.100
[INFO] [stderr]    Compiling js-sys v0.3.77
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling web-sys v0.3.77
[INFO] [stderr]    Compiling serde-wasm-bindgen v0.6.5
[INFO] [stderr]    Compiling polyomino-tiling v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 22.53s
[INFO] running `Command { std: "docker" "inspect" "f947f2bcc0eb471d24f150494883f585aee9b0a8d2eb0dc755d99d83913bbbb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f947f2bcc0eb471d24f150494883f585aee9b0a8d2eb0dc755d99d83913bbbb6", kill_on_drop: false }`
[INFO] [stdout] f947f2bcc0eb471d24f150494883f585aee9b0a8d2eb0dc755d99d83913bbbb6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6dd74d6035b829b384cbb75b4a1f0ef969565180fb50a50e2d6a758c500d4b9a
[INFO] running `Command { std: "docker" "start" "-a" "6dd74d6035b829b384cbb75b4a1f0ef969565180fb50a50e2d6a758c500d4b9a", kill_on_drop: false }`
[INFO] [stderr]    Compiling polyomino-tiling v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.50s
[INFO] running `Command { std: "docker" "inspect" "6dd74d6035b829b384cbb75b4a1f0ef969565180fb50a50e2d6a758c500d4b9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd74d6035b829b384cbb75b4a1f0ef969565180fb50a50e2d6a758c500d4b9a", kill_on_drop: false }`
[INFO] [stdout] 6dd74d6035b829b384cbb75b4a1f0ef969565180fb50a50e2d6a758c500d4b9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTDOCFLAGS=--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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] db3c7ca940eb10c668ca4db2e8fcf574f985a90004786227752f87bf07990d4c
[INFO] running `Command { std: "docker" "start" "-a" "db3c7ca940eb10c668ca4db2e8fcf574f985a90004786227752f87bf07990d4c", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/polyomino_tiling-1174f1d8080fa608)
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test dancing_links::tests::test_dancing_links_no_solution ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_simple ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_complex ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_get_all_rotations_and_mirrors ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_mirror_matrix ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_piece_placements_to_matrix_of_piece_ids ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_is_board_size_eq_to_number_of_cells_of_polyominoes ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_rotate_matrix ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_single_row ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_solve_polyomino_tiling_no_solution ... ok
[INFO] [stdout] test pretty::tests::test_matrix_to_str ... ok
[INFO] [stdout] test pretty::tests::test_str_to_matrix ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_flatten ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_get_all_placement_without_rotation_nor_mirror ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 14 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/polyomino_tiling-7ee993989d2cf769)
[INFO] [stdout] 
[INFO] [stdout] running 15 tests
[INFO] [stdout] test dancing_links::tests::test_dancing_links_complex ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_simple ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_no_solution ... ok
[INFO] [stdout] test dancing_links::tests::test_dancing_links_single_row ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_flatten ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_get_all_placement_without_rotation_nor_mirror ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_is_board_size_eq_to_number_of_cells_of_polyominoes ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_solve_polyomino_tiling_no_solution ... ok
[INFO] [stdout] test pretty::tests::test_matrix_to_str ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_piece_placements_to_matrix_of_piece_ids ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_rotate_matrix ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_mirror_matrix ... ok
[INFO] [stdout] test pretty::tests::test_str_to_matrix ... ok
[INFO] [stdout] test polyomino_tiling::tests::test_get_all_rotations_and_mirrors ... ok
[INFO] [stdout] test tests::test_solve ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 15 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "db3c7ca940eb10c668ca4db2e8fcf574f985a90004786227752f87bf07990d4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db3c7ca940eb10c668ca4db2e8fcf574f985a90004786227752f87bf07990d4c", kill_on_drop: false }`
[INFO] [stdout] db3c7ca940eb10c668ca4db2e8fcf574f985a90004786227752f87bf07990d4c
