[INFO] cloning repository https://github.com/iterate/miniwoop-backend
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iterate/miniwoop-backend" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e6bc456029694b3624ddb52a303126a58c68449
[INFO] documenting iterate/miniwoop-backend against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend" "/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/iterate/miniwoop-backend on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iterate/miniwoop-backend
[INFO] finished tweaking git repo https://github.com/iterate/miniwoop-backend
[INFO] tweaked toml for git repo https://github.com/iterate/miniwoop-backend written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/iterate/miniwoop-backend already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--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-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d17df0e160e7483993b2d8098451086b1d76757648350fc60074743b7504b143
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d17df0e160e7483993b2d8098451086b1d76757648350fc60074743b7504b143", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d17df0e160e7483993b2d8098451086b1d76757648350fc60074743b7504b143", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d17df0e160e7483993b2d8098451086b1d76757648350fc60074743b7504b143", kill_on_drop: false }`
[INFO] [stdout] d17df0e160e7483993b2d8098451086b1d76757648350fc60074743b7504b143
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4a3f0b4167fd196be44e8682f5c3d85e5076c807664b94fb22861b870506736d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4a3f0b4167fd196be44e8682f5c3d85e5076c807664b94fb22861b870506736d", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.24
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking futures v0.1.14
[INFO] [stderr]     Checking num-traits v0.1.39
[INFO] [stderr]     Checking cfg-if v0.1.1
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking serde v1.0.8
[INFO] [stderr]     Checking percent-encoding v1.0.0
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]    Compiling unicase v2.0.0
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr]     Checking net2 v0.2.29
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking thread-id v3.1.0
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking num_cpus v1.5.1
[INFO] [stderr]     Checking time v0.1.37
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]     Checking bytes v0.4.4
[INFO] [stderr]     Checking num-integer v0.1.34
[INFO] [stderr]     Checking mio v0.6.9
[INFO] [stderr]     Checking mime v0.3.2
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]     Checking num v0.1.39
[INFO] [stderr]    Compiling serde_derive v1.0.8
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]     Checking tokio-io v0.1.2
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking futures-cpupool v0.1.5
[INFO] [stderr]     Checking tokio-core v0.1.8
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking pretty_env_logger v0.1.1
[INFO] [stderr]     Checking tokio-proto v0.1.1
[INFO] [stderr]     Checking chrono v0.3.1
[INFO] [stderr]     Checking uuid v0.5.0
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking hyper v0.11.0
[INFO] [stderr]  Documenting miniwoop-backend v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `miniwoop-backend`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name miniwoop_backend src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-a1a096b1dd875302.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-50c025a128865264.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-f0aa2c816a112310.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-4f4cd2c0a0b8009c.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-a876e5654f5640a1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-ba0f37f269e1339c.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-e7970e915d46db84.rmeta --extern unicase=/opt/rustwide/target/debug/deps/libunicase-e40efbf6674663fe.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-101ef47d4b0fb7e9.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "4a3f0b4167fd196be44e8682f5c3d85e5076c807664b94fb22861b870506736d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a3f0b4167fd196be44e8682f5c3d85e5076c807664b94fb22861b870506736d", kill_on_drop: false }`
[INFO] [stdout] 4a3f0b4167fd196be44e8682f5c3d85e5076c807664b94fb22861b870506736d