[INFO] cloning repository https://github.com/Weltraumschaf/minivm
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Weltraumschaf/minivm" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWeltraumschaf%2Fminivm", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWeltraumschaf%2Fminivm'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6257253bbca9cc6ea5f83a3c6dca902dcd1d1f6
[INFO] documenting Weltraumschaf/minivm 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%2FWeltraumschaf%2Fminivm" "/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/Weltraumschaf/minivm 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] started tweaking git repo https://github.com/Weltraumschaf/minivm
[INFO] finished tweaking git repo https://github.com/Weltraumschaf/minivm
[INFO] tweaked toml for git repo https://github.com/Weltraumschaf/minivm written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Weltraumschaf/minivm 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]  Downloading crates ...
[INFO] [stderr]   Downloaded quick-error v1.2.1
[INFO] [stderr]   Downloaded wincolor v0.1.6
[INFO] [stderr]   Downloaded env_logger v0.5.4
[INFO] [stderr]   Downloaded humantime v1.1.0
[INFO] [stderr]   Downloaded termcolor v0.3.5
[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" "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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 98ccdafe5058a24ef96d7a4a119d6364b5009f7ae8d95259869777233bce179a
[INFO] running `Command { std: "docker" "start" "-a" "98ccdafe5058a24ef96d7a4a119d6364b5009f7ae8d95259869777233bce179a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98ccdafe5058a24ef96d7a4a119d6364b5009f7ae8d95259869777233bce179a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98ccdafe5058a24ef96d7a4a119d6364b5009f7ae8d95259869777233bce179a", kill_on_drop: false }`
[INFO] [stdout] 98ccdafe5058a24ef96d7a4a119d6364b5009f7ae8d95259869777233bce179a
[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" "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] 0745655bcc40d00b319a2a41bb9e13d4eee0836f52cbd75ee5a5ee94bb69335b
[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" "0745655bcc40d00b319a2a41bb9e13d4eee0836f52cbd75ee5a5ee94bb69335b", kill_on_drop: false }`
[INFO] [stderr]     Checking termcolor v0.3.5
[INFO] [stderr]     Checking humantime v1.1.0
[INFO] [stderr]     Checking env_logger v0.5.4
[INFO] [stderr]  Documenting minivm v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_from)]
[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 `minivm`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name minivm 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 byteorder=/opt/rustwide/target/debug/deps/libbyteorder-2c45f55086d0528d.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-a326235eff2e363e.rmeta --extern env_logger=/opt/rustwide/target/debug/deps/libenv_logger-8e7a0820015ca898.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-69fd9253e88d45f6.rmeta --cap-lints=warn --crate-version 1.0.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "0745655bcc40d00b319a2a41bb9e13d4eee0836f52cbd75ee5a5ee94bb69335b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0745655bcc40d00b319a2a41bb9e13d4eee0836f52cbd75ee5a5ee94bb69335b", kill_on_drop: false }`
[INFO] [stdout] 0745655bcc40d00b319a2a41bb9e13d4eee0836f52cbd75ee5a5ee94bb69335b
