[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 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iterate/miniwoop-backend on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-2/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" "+1.54.0" "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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c92c6bd5af837e3a73cb33aa0b08f8c9af89ccaffd9117ee0a51e392b9b2c314
[INFO] running `Command { std: "docker" "start" "-a" "c92c6bd5af837e3a73cb33aa0b08f8c9af89ccaffd9117ee0a51e392b9b2c314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c92c6bd5af837e3a73cb33aa0b08f8c9af89ccaffd9117ee0a51e392b9b2c314", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c92c6bd5af837e3a73cb33aa0b08f8c9af89ccaffd9117ee0a51e392b9b2c314", kill_on_drop: false }`
[INFO] [stdout] c92c6bd5af837e3a73cb33aa0b08f8c9af89ccaffd9117ee0a51e392b9b2c314
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b7b97ff4b2c0b09f3c62d73817856817f6c2a8c656ebc344b031103dbcb06ac
[INFO] running `Command { std: "docker" "start" "-a" "6b7b97ff4b2c0b09f3c62d73817856817f6c2a8c656ebc344b031103dbcb06ac", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.24
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking futures v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.1
[INFO] [stderr]     Checking num-traits v0.1.39
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking serde v1.0.8
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking percent-encoding v1.0.0
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking httparse v1.2.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]     Checking num-integer v0.1.34
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking thread-id v3.1.0
[INFO] [stderr]     Checking net2 v0.2.29
[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 num-iter v0.1.33
[INFO] [stderr]    Compiling unicase v2.0.0
[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 v0.1.39
[INFO] [stderr]     Checking mio v0.6.9
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking futures-cpupool v0.1.5
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]     Checking tokio-io v0.1.2
[INFO] [stderr]     Checking mime v0.3.2
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]     Checking tokio-core v0.1.8
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking chrono v0.3.1
[INFO] [stderr]     Checking uuid v0.5.0
[INFO] [stderr]     Checking pretty_env_logger v0.1.1
[INFO] [stderr]     Checking tokio-proto v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.8
[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]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[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-5ac6aecaf46fb68f.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-574115ead86e1e25.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-1b113b5be1b2d076.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-687f7fcdc95fa9f6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-a7f76e305887e483.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-99fd0971743ab3e1.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a5c007d69dba5890.rmeta --extern unicase=/opt/rustwide/target/debug/deps/libunicase-c91ae9c54d29ca58.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-3866f6b9f5304f4e.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6b7b97ff4b2c0b09f3c62d73817856817f6c2a8c656ebc344b031103dbcb06ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b7b97ff4b2c0b09f3c62d73817856817f6c2a8c656ebc344b031103dbcb06ac", kill_on_drop: false }`
[INFO] [stdout] 6b7b97ff4b2c0b09f3c62d73817856817f6c2a8c656ebc344b031103dbcb06ac
