[INFO] cloning repository https://github.com/guoguojin/rust-example-cli
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guoguojin/rust-example-cli" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguoguojin%2Frust-example-cli", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguoguojin%2Frust-example-cli'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 84d6f22d39c56f4145d3f52407dae83808be4213
[INFO] documenting guoguojin/rust-example-cli 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%2Fguoguojin%2Frust-example-cli" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guoguojin/rust-example-cli 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/guoguojin/rust-example-cli
[INFO] finished tweaking git repo https://github.com/guoguojin/rust-example-cli
[INFO] tweaked toml for git repo https://github.com/guoguojin/rust-example-cli written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/guoguojin/rust-example-cli 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 rust-ini v0.12.2
[INFO] [stderr]   Downloaded structopt-derive v0.2.10
[INFO] [stderr]   Downloaded structopt v0.2.10
[INFO] [stderr]   Downloaded yaml-rust v0.4.0
[INFO] [stderr]   Downloaded config v0.9.0
[INFO] [stderr]   Downloaded serde-hjson v0.8.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stdout] 077edf010bea8a9e3db6bb6798d8e4e9aede30ea7eb7e2f86d545b8e4efb6f1b
[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" "077edf010bea8a9e3db6bb6798d8e4e9aede30ea7eb7e2f86d545b8e4efb6f1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "077edf010bea8a9e3db6bb6798d8e4e9aede30ea7eb7e2f86d545b8e4efb6f1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "077edf010bea8a9e3db6bb6798d8e4e9aede30ea7eb7e2f86d545b8e4efb6f1b", kill_on_drop: false }`
[INFO] [stdout] 077edf010bea8a9e3db6bb6798d8e4e9aede30ea7eb7e2f86d545b8e4efb6f1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stdout] a3d7c7fba5a70c0be6efbdbeb216c75159dbfd03d17deecaaa6468433e5944d5
[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" "a3d7c7fba5a70c0be6efbdbeb216c75159dbfd03d17deecaaa6468433e5944d5", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]    Compiling serde v1.0.70
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking itoa v0.4.2
[INFO] [stderr]     Checking rust-ini v0.12.2
[INFO] [stderr]     Checking yaml-rust v0.4.0
[INFO] [stderr]    Compiling syn v0.14.4
[INFO] [stderr]     Checking thread-id v2.0.0
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking atty v0.2.10
[INFO] [stderr]     Checking memchr v2.0.1
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking nom v4.0.0
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]     Checking serde_test v0.8.23
[INFO] [stderr]    Compiling structopt-derive v0.2.10
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking serde-hjson v0.8.1
[INFO] [stderr]     Checking structopt v0.2.10
[INFO] [stderr]     Checking serde_json v1.0.22
[INFO] [stderr]     Checking toml v0.4.6
[INFO] [stderr]     Checking config v0.9.0
[INFO] [stderr]  Documenting example-cli-app v0.1.0 (/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(extern_prelude)]
[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 `example-cli-app`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name example_cli_app 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 config=/opt/rustwide/target/debug/deps/libconfig-a4dbd8b5e187a1b8.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-e2c7117cdcbd0b5c.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-5791878a83b9ab28.so --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-27ca182bb8f8d95e.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "a3d7c7fba5a70c0be6efbdbeb216c75159dbfd03d17deecaaa6468433e5944d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3d7c7fba5a70c0be6efbdbeb216c75159dbfd03d17deecaaa6468433e5944d5", kill_on_drop: false }`
[INFO] [stdout] a3d7c7fba5a70c0be6efbdbeb216c75159dbfd03d17deecaaa6468433e5944d5