[INFO] cloning repository https://github.com/notomo/vimonga
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/notomo/vimonga" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnotomo%2Fvimonga", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnotomo%2Fvimonga'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6e7142f23376d2403697bf3f5118ba64ef08450
[INFO] documenting notomo/vimonga against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnotomo%2Fvimonga" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/notomo/vimonga on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/notomo/vimonga
[INFO] finished tweaking git repo https://github.com/notomo/vimonga
[INFO] tweaked toml for git repo https://github.com/notomo/vimonga written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/notomo/vimonga already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded semver v0.8.0
[INFO] [stderr]   Downloaded scan_fmt v0.1.3
[INFO] [stderr]   Downloaded textnonce v0.6.4
[INFO] [stderr]   Downloaded crypto-mac v0.6.2
[INFO] [stderr]   Downloaded separator v0.3.1
[INFO] [stderr]   Downloaded md-5 v0.7.0
[INFO] [stderr]   Downloaded bson v0.13.0
[INFO] [stderr]   Downloaded hmac v0.6.3
[INFO] [stderr]   Downloaded pbkdf2 v0.2.3
[INFO] [stderr]   Downloaded mongodb v0.3.12
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 57c2547225245e0475d54f8dac3f01987922976507601af9dddc43751f0e52eb
[INFO] running `Command { std: "docker" "start" "-a" "57c2547225245e0475d54f8dac3f01987922976507601af9dddc43751f0e52eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57c2547225245e0475d54f8dac3f01987922976507601af9dddc43751f0e52eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57c2547225245e0475d54f8dac3f01987922976507601af9dddc43751f0e52eb", kill_on_drop: false }`
[INFO] [stdout] 57c2547225245e0475d54f8dac3f01987922976507601af9dddc43751f0e52eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9323b13a524abb7f8719fba02b9266c071bf9f044b67c5f8ae3e961ec619793c
[INFO] running `Command { std: "docker" "start" "-a" "9323b13a524abb7f8719fba02b9266c071bf9f044b67c5f8ae3e961ec619793c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]    Compiling memchr v2.1.3
[INFO] [stderr]     Checking arrayref v0.3.5
[INFO] [stderr]    Compiling serde v1.0.87
[INFO] [stderr]    Compiling cc v1.0.29
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking constant_time_eq v0.1.3
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]     Checking indexmap v1.0.2
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking linked-hash-map v0.5.1
[INFO] [stderr]     Checking try_from v0.2.2
[INFO] [stderr]     Checking bufstream v0.1.4
[INFO] [stderr]     Checking separator v0.3.1
[INFO] [stderr]     Checking data-encoding v2.1.2
[INFO] [stderr]    Compiling backtrace v0.3.13
[INFO] [stderr]     Checking semver v0.8.0
[INFO] [stderr]     Checking block-buffer v0.3.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking ryu v0.2.7
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking crypto-mac v0.6.2
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]     Checking sha2 v0.7.1
[INFO] [stderr]     Checking sha-1 v0.7.0
[INFO] [stderr]     Checking md-5 v0.7.0
[INFO] [stderr]     Checking hmac v0.6.3
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking pbkdf2 v0.2.3
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]     Checking scan_fmt v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.87
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking serde_json v1.0.38
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking bson v0.13.0
[INFO] [stderr]     Checking textnonce v0.6.4
[INFO] [stderr]     Checking mongodb v0.3.12
[INFO] [stderr]  Documenting vimonga v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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 `vimonga`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name vimonga 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 bson=/opt/rustwide/target/debug/deps/libbson-0795c0bb39340209.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-a3be30cef9d88680.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-cee98533fabd73ec.rmeta --extern mongodb=/opt/rustwide/target/debug/deps/libmongodb-6f7363480fbbcadd.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-17cd405e4d2eeee5.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-9b7c98baaca0bf17.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-eda22ecdee56050d.rmeta --cap-lints=warn --crate-version 0.0.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9323b13a524abb7f8719fba02b9266c071bf9f044b67c5f8ae3e961ec619793c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9323b13a524abb7f8719fba02b9266c071bf9f044b67c5f8ae3e961ec619793c", kill_on_drop: false }`
[INFO] [stdout] 9323b13a524abb7f8719fba02b9266c071bf9f044b67c5f8ae3e961ec619793c