[INFO] fetching crate dancing-links 0.2.0...
[INFO] testing dancing-links-0.2.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate dancing-links 0.2.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate dancing-links 0.2.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dancing-links 0.2.0
[INFO] finished tweaking crates.io crate dancing-links 0.2.0
[INFO] tweaked toml for crates.io crate dancing-links 0.2.0 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--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-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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 85717cc071cb126f75cc5c298391639f7c592f66160d7cb6b91f7567b299a2a2
[INFO] running `Command { std: "docker" "start" "-a" "85717cc071cb126f75cc5c298391639f7c592f66160d7cb6b91f7567b299a2a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "85717cc071cb126f75cc5c298391639f7c592f66160d7cb6b91f7567b299a2a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85717cc071cb126f75cc5c298391639f7c592f66160d7cb6b91f7567b299a2a2", kill_on_drop: false }`
[INFO] [stdout] 85717cc071cb126f75cc5c298391639f7c592f66160d7cb6b91f7567b299a2a2
[INFO] running `Command { std: "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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] edbe7e89cd1df79fd5ea9bae422d67ed4d97e65d93c0266d0d0302d30811bf3d
[INFO] running `Command { std: "docker" "start" "-a" "edbe7e89cd1df79fd5ea9bae422d67ed4d97e65d93c0266d0d0302d30811bf3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling bumpalo v3.9.1
[INFO] [stderr]    Compiling dancing-links v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 132 |     add_direction!(add_below, down, up);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 134 |     add_direction!(add_above, up, down);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 136 |     add_direction!(add_right, right, left);
[INFO] [stdout]     |     -------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `min_column`
[INFO] [stdout]   --> src/solver.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     min_column: *mut Column,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `Command { std: "docker" "inspect" "edbe7e89cd1df79fd5ea9bae422d67ed4d97e65d93c0266d0d0302d30811bf3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edbe7e89cd1df79fd5ea9bae422d67ed4d97e65d93c0266d0d0302d30811bf3d", kill_on_drop: false }`
[INFO] [stdout] edbe7e89cd1df79fd5ea9bae422d67ed4d97e65d93c0266d0d0302d30811bf3d
[INFO] running `Command { std: "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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd56413c849a12e819ab74d4553d6ab7acbc73afd68fd309ba0ca14a3520667d
[INFO] running `Command { std: "docker" "start" "-a" "bd56413c849a12e819ab74d4553d6ab7acbc73afd68fd309ba0ca14a3520667d", kill_on_drop: false }`
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 132 |     add_direction!(add_below, down, up);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 134 |     add_direction!(add_above, up, down);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling dancing-links v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 136 |     add_direction!(add_right, right, left);
[INFO] [stdout]     |     -------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `min_column`
[INFO] [stdout]   --> src/solver.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     min_column: *mut Column,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 132 |     add_direction!(add_below, down, up);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 134 |     add_direction!(add_above, up, down);
[INFO] [stdout]     |     ----------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/grid/base_node.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         #[$lint]
[INFO] [stdout]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stdout] ...
[INFO] [stdout] 136 |     add_direction!(add_right, right, left);
[INFO] [stdout]     |     -------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: attribute `allow` with an empty list has no effect
[INFO] [stdout]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `min_column`
[INFO] [stdout]   --> src/solver.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     min_column: *mut Column,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `Command { std: "docker" "inspect" "bd56413c849a12e819ab74d4553d6ab7acbc73afd68fd309ba0ca14a3520667d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd56413c849a12e819ab74d4553d6ab7acbc73afd68fd309ba0ca14a3520667d", kill_on_drop: false }`
[INFO] [stdout] bd56413c849a12e819ab74d4553d6ab7acbc73afd68fd309ba0ca14a3520667d
[INFO] running `Command { std: "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" "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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] bca6b3503566aa66c087abd59d331f65da91b1da3baaa33c78fac86802c81bbb
[INFO] running `Command { std: "docker" "start" "-a" "bca6b3503566aa66c087abd59d331f65da91b1da3baaa33c78fac86802c81bbb", kill_on_drop: false }`
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]    --> src/grid/base_node.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 |         #[$lint]
[INFO] [stderr]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stderr] ...
[INFO] [stderr] 132 |     add_direction!(add_below, down, up);
[INFO] [stderr]     |     ----------------------------------- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stderr]     = note: attribute `allow` with an empty list has no effect
[INFO] [stderr]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]    --> src/grid/base_node.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 |         #[$lint]
[INFO] [stderr]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stderr] ...
[INFO] [stderr] 134 |     add_direction!(add_above, up, down);
[INFO] [stderr]     |     ----------------------------------- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: attribute `allow` with an empty list has no effect
[INFO] [stderr]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]    --> src/grid/base_node.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 |         #[$lint]
[INFO] [stderr]     |         ^^^^^^^^ help: remove this attribute
[INFO] [stderr] ...
[INFO] [stderr] 136 |     add_direction!(add_right, right, left);
[INFO] [stderr]     |     -------------------------------------- in this macro invocation
[INFO] [stderr]     |
[INFO] [stderr]     = note: attribute `allow` with an empty list has no effect
[INFO] [stderr]     = note: this warning originates in the macro `add_direction` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `min_column`
[INFO] [stderr]   --> src/solver.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     min_column: *mut Column,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `dancing-links` (lib) generated 4 warnings
[INFO] [stderr] warning: `dancing-links` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/dancing_links-1723559ad44e2292)
[INFO] [stdout] 
[INFO] [stdout] running 19 tests
[INFO] [stdout] test grid::tests::create_a_small_grid ... ok
[INFO] [stdout] test grid::tests::cover_uncover_all ... ok
[INFO] [stdout] test grid::tests::create_weird_grids ... ok
[INFO] [stdout] test grid::tests::cover_uncover_column ... ok
[INFO] [stdout] test latin_square::tests::check_all_possibilities ... ok
[INFO] [stdout] test grid::tests::latin_square_cover_1 ... ok
[INFO] [stdout] test latin_square::tests::check_generated_possibilities_constraints ... ok
[INFO] [stdout] test latin_square::tests::solve_impossible_latin_square ... ok
[INFO] [stdout] test queens::tests::check_diagonal_indices ... ok
[INFO] [stdout] test latin_square::tests::solve_small_latin_square ... ok
[INFO] [stdout] test latin_square::tests::solve_multi_solution_latin_square ... ok
[INFO] [stdout] test util::tests::latin_square_test_1 ... ok
[INFO] [stdout] test util::tests::latin_square_test_3 ... ok
[INFO] [stdout] test util::tests::three_combo ... ok
[INFO] [stdout] test queens::tests::check_tiny_boards ... ok
[INFO] [stdout] test queens::tests::check_small_board ... ok
[INFO] [stdout] test sudoku::tests::check_generated_possibilities_constraints ... ok
[INFO] [stdout] test sudoku::tests::solve_small_sudoku ... ok
[INFO] [stdout] test queens::tests::count_medium_board ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests dancing-links
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "bca6b3503566aa66c087abd59d331f65da91b1da3baaa33c78fac86802c81bbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bca6b3503566aa66c087abd59d331f65da91b1da3baaa33c78fac86802c81bbb", kill_on_drop: false }`
[INFO] [stdout] bca6b3503566aa66c087abd59d331f65da91b1da3baaa33c78fac86802c81bbb