[INFO] cloning repository https://github.com/deifactor/iterativ
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/deifactor/iterativ" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdeifactor%2Fiterativ", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdeifactor%2Fiterativ'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 52d9f71fa7d16e53a1dc805bfa64c30b03383988
[INFO] documenting deifactor/iterativ 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%2Fdeifactor%2Fiterativ" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/deifactor/iterativ 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/deifactor/iterativ
[INFO] finished tweaking git repo https://github.com/deifactor/iterativ
[INFO] tweaked toml for git repo https://github.com/deifactor/iterativ written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/deifactor/iterativ 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 string_cache_codegen v0.3.1
[INFO] [stderr]   Downloaded immi v1.0.4
[INFO] [stderr]   Downloaded lru v0.4.3
[INFO] [stderr]   Downloaded RustyXML v0.1.1
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.56
[INFO] [stderr]   Downloaded html5ever v0.13.1
[INFO] [stderr]   Downloaded glutin_emscripten_sys v0.1.0
[INFO] [stderr]   Downloaded simple_logger v1.4.0
[INFO] [stderr]   Downloaded lalrpop-util v0.16.3
[INFO] [stderr]   Downloaded diff v0.1.12
[INFO] [stderr]   Downloaded bit-set v0.5.1
[INFO] [stderr]   Downloaded gl v0.13.0
[INFO] [stderr]   Downloaded bit-vec v0.5.1
[INFO] [stderr]   Downloaded quicksilver v0.3.20
[INFO] [stderr]   Downloaded string_cache v0.4.0
[INFO] [stderr]   Downloaded utf-8 v0.6.0
[INFO] [stderr]   Downloaded html2runes v1.0.1
[INFO] [stderr]   Downloaded lalrpop v0.16.3
[INFO] [stderr]   Downloaded webidl v0.8.0
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.56
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.56
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.56
[INFO] [stderr]   Downloaded html5ever-atoms v0.2.2
[INFO] [stderr]   Downloaded tendril v0.2.4
[INFO] [stderr]   Downloaded ena v0.11.0
[INFO] [stderr]   Downloaded webgl_generator v0.2.0
[INFO] [stderr]   Downloaded webgl_stdweb v0.3.0
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.56
[INFO] [stderr]   Downloaded web_logger v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 93a26e80965c0e498f4bd84fed88a2fd49480a95607b28e897c93d1d308c0d20
[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" "93a26e80965c0e498f4bd84fed88a2fd49480a95607b28e897c93d1d308c0d20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "93a26e80965c0e498f4bd84fed88a2fd49480a95607b28e897c93d1d308c0d20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93a26e80965c0e498f4bd84fed88a2fd49480a95607b28e897c93d1d308c0d20", kill_on_drop: false }`
[INFO] [stdout] 93a26e80965c0e498f4bd84fed88a2fd49480a95607b28e897c93d1d308c0d20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 0fa523b2c2303a9187bf936275fc90711f4a6fa451913f3e53d1c10ade6c7ea4
[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" "0fa523b2c2303a9187bf936275fc90711f4a6fa451913f3e53d1c10ade6c7ea4", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.13
[INFO] [stderr]     Checking hibitset v0.6.2
[INFO] [stderr]    Compiling stdweb v0.4.20
[INFO] [stderr]     Checking colored v1.9.2
[INFO] [stderr]    Compiling gl v0.13.0
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling derive_more v0.99.2
[INFO] [stderr]    Compiling specs-derive v0.4.0
[INFO] [stderr]    Compiling derivative v1.0.3
[INFO] [stderr]     Checking tiff v0.2.2
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking png v0.14.1
[INFO] [stderr]     Checking image v0.21.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]     Checking simple_logger v1.4.0
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]    Compiling const-random-macro v0.1.6
[INFO] [stderr]     Checking const-random v0.1.6
[INFO] [stderr]     Checking ahash v0.2.18
[INFO] [stderr]     Checking hashbrown v0.6.3
[INFO] [stderr]     Checking winit v0.19.5
[INFO] [stderr]     Checking shred v0.9.4
[INFO] [stderr]     Checking lru v0.4.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/shred-0.9.4/src/lib.rs:54:34
[INFO] [stdout]    |
[INFO] [stdout] 54 | #![cfg_attr(feature = "nightly", feature(core_intrinsics))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shred`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0fa523b2c2303a9187bf936275fc90711f4a6fa451913f3e53d1c10ade6c7ea4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fa523b2c2303a9187bf936275fc90711f4a6fa451913f3e53d1c10ade6c7ea4", kill_on_drop: false }`
[INFO] [stdout] 0fa523b2c2303a9187bf936275fc90711f4a6fa451913f3e53d1c10ade6c7ea4