[INFO] cloning repository https://github.com/martin-t/sokoban-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/martin-t/sokoban-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartin-t%2Fsokoban-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartin-t%2Fsokoban-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 19c67d097259b8b86f88119683ed4ae5cbf59951
[INFO] documenting martin-t/sokoban-solver against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmartin-t%2Fsokoban-solver" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/martin-t/sokoban-solver on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-7/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/martin-t/sokoban-solver
[INFO] finished tweaking git repo https://github.com/martin-t/sokoban-solver
[INFO] tweaked toml for git repo https://github.com/martin-t/sokoban-solver written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/martin-t/sokoban-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.75
[INFO] [stderr]   Downloaded predicates-tree v1.0.3
[INFO] [stderr]   Downloaded criterion-plot v0.4.4
[INFO] [stderr]   Downloaded difflib v0.4.0
[INFO] [stderr]   Downloaded predicates v2.0.1
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.75
[INFO] [stderr]   Downloaded plotters-backend v0.3.2
[INFO] [stderr]   Downloaded plotters-svg v0.3.1
[INFO] [stderr]   Downloaded js-sys v0.3.52
[INFO] [stderr]   Downloaded web-sys v0.3.52
[INFO] [stderr]   Downloaded criterion v0.3.5
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.75
[INFO] [stderr]   Downloaded separator v0.4.1
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.75
[INFO] [stderr]   Downloaded assert_cmd v2.0.0
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.75
[INFO] [stderr]   Downloaded dot v0.1.4
[INFO] running `Command { std: "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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f1fa9b130ca3ff04e4027be2ea852762fa14d87482ff3611aea8648f6676f495
[INFO] running `Command { std: "docker" "start" "-a" "f1fa9b130ca3ff04e4027be2ea852762fa14d87482ff3611aea8648f6676f495", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1fa9b130ca3ff04e4027be2ea852762fa14d87482ff3611aea8648f6676f495", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1fa9b130ca3ff04e4027be2ea852762fa14d87482ff3611aea8648f6676f495", kill_on_drop: false }`
[INFO] [stdout] f1fa9b130ca3ff04e4027be2ea852762fa14d87482ff3611aea8648f6676f495
[INFO] running `Command { std: "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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a712299201d5edc894fd9de24eb13a8b2dddb04417d695bc78cdcf258799586a
[INFO] running `Command { std: "docker" "start" "-a" "a712299201d5edc894fd9de24eb13a8b2dddb04417d695bc78cdcf258799586a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking separator v0.4.1
[INFO] [stderr]     Checking bitflags v1.2.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]  Documenting sokoban-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(crate_visibility_modifier)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(min_specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `sokoban-solver`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name sokoban_solver src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern clap=/opt/rustwide/target/debug/deps/libclap-1cac06b89117d917.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-faab1655e209be69.rmeta --extern fnv=/opt/rustwide/target/debug/deps/libfnv-ba95a15ffe9fa762.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-17f0bf53547bad3b.rmeta --extern separator=/opt/rustwide/target/debug/deps/libseparator-45f63c643d02d022.rmeta --extern typed_arena=/opt/rustwide/target/debug/deps/libtyped_arena-d81e9e584574cd66.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "a712299201d5edc894fd9de24eb13a8b2dddb04417d695bc78cdcf258799586a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a712299201d5edc894fd9de24eb13a8b2dddb04417d695bc78cdcf258799586a", kill_on_drop: false }`
[INFO] [stdout] a712299201d5edc894fd9de24eb13a8b2dddb04417d695bc78cdcf258799586a
