[INFO] cloning repository https://github.com/alanwilhelm/starling-genesis
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alanwilhelm/starling-genesis" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falanwilhelm%2Fstarling-genesis", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falanwilhelm%2Fstarling-genesis'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39c845b4b014123b1473ee6bc3c5188953ade27e
[INFO] documenting alanwilhelm/starling-genesis 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%2Falanwilhelm%2Fstarling-genesis" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alanwilhelm/starling-genesis 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/alanwilhelm/starling-genesis
[INFO] finished tweaking git repo https://github.com/alanwilhelm/starling-genesis
[INFO] tweaked toml for git repo https://github.com/alanwilhelm/starling-genesis written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/alanwilhelm/starling-genesis 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating git repository `https://github.com/gyscos/Cursive`
[INFO] [stderr]     Updating git repository `https://github.com/alanwilhelm/murmur`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded reexport-proc-macro v1.0.2
[INFO] [stderr]   Downloaded ncurses v5.91.0
[INFO] [stderr]   Downloaded num-bigint v0.1.43
[INFO] [stderr]   Downloaded enumset v0.3.3
[INFO] [stderr]   Downloaded serde v1.0.55
[INFO] [stderr]   Downloaded num-integer v0.1.38
[INFO] [stderr]   Downloaded num-traits v0.2.4
[INFO] [stderr]   Downloaded generic-array v0.6.0
[INFO] [stderr]   Downloaded digest v0.4.0
[INFO] [stderr]   Downloaded byte-tools v0.1.3
[INFO] [stderr]   Downloaded crunchy v0.1.6
[INFO] [stderr]   Downloaded base-x v0.2.2
[INFO] [stderr]   Downloaded multibase v0.6.0
[INFO] [stderr]   Downloaded syn v0.13.10
[INFO] [stderr]   Downloaded integer-encoding v1.0.5
[INFO] [stderr]   Downloaded sha2 v0.4.2
[INFO] [stderr]   Downloaded cid v0.2.3
[INFO] [stderr]   Downloaded tiny-keccak v1.4.1
[INFO] [stderr]   Downloaded easy-hash v0.1.0
[INFO] [stderr]   Downloaded multihash v0.7.0
[INFO] [stderr]   Downloaded digest-buffer v0.2.0
[INFO] [stderr]   Downloaded multiaddr v0.3.0
[INFO] [stderr]   Downloaded enum-map v0.2.29
[INFO] [stderr]   Downloaded enum-map-derive v0.2.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] a90c69c52571c7bb6e3d887bafb5903a7ecfe0c15cdaa309c495bfc45c79d665
[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" "a90c69c52571c7bb6e3d887bafb5903a7ecfe0c15cdaa309c495bfc45c79d665", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a90c69c52571c7bb6e3d887bafb5903a7ecfe0c15cdaa309c495bfc45c79d665", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a90c69c52571c7bb6e3d887bafb5903a7ecfe0c15cdaa309c495bfc45c79d665", kill_on_drop: false }`
[INFO] [stdout] a90c69c52571c7bb6e3d887bafb5903a7ecfe0c15cdaa309c495bfc45c79d665
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 2c79b7ff0d8986721f9ce4688e2ca0f7442bf8c95086d30dbb4bfd59c5418576
[INFO] running `Command { std: "docker" "start" "-a" "2c79b7ff0d8986721f9ce4688e2ca0f7442bf8c95086d30dbb4bfd59c5418576", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]     Checking base-x v0.2.2
[INFO] [stderr]     Checking byte-tools v0.1.3
[INFO] [stderr]     Checking integer-encoding v1.0.5
[INFO] [stderr]     Checking reexport-proc-macro v1.0.2
[INFO] [stderr]     Checking serde v1.0.55
[INFO] [stderr]     Checking array-macro v1.0.2
[INFO] [stderr]     Checking unicode-segmentation v1.2.1
[INFO] [stderr]     Checking enumset v0.3.3
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking log v0.4.1
[INFO] [stderr]     Checking net2 v0.2.32
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking bytes v0.4.7
[INFO] [stderr]     Checking tokio-timer v0.2.3
[INFO] [stderr]     Checking crossbeam-epoch v0.4.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking generic-array v0.6.0
[INFO] [stderr]     Checking tiny-keccak v1.4.1
[INFO] [stderr]     Checking multibase v0.6.0
[INFO] [stderr]     Checking num-integer v0.1.38
[INFO] [stderr]    Compiling syn v0.13.10
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking digest v0.4.0
[INFO] [stderr]     Checking digest-buffer v0.2.0
[INFO] [stderr]     Checking mio v0.6.14
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]     Checking tokio-io v0.1.6
[INFO] [stderr]     Checking sha2 v0.4.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]     Checking crossbeam-deque v0.3.1
[INFO] [stderr]     Checking num-bigint v0.1.43
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking tokio-threadpool v0.1.3
[INFO] [stderr]     Checking easy-hash v0.1.0
[INFO] [stderr]     Checking tokio-reactor v0.1.1
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]     Checking tokio-tcp v0.1.0
[INFO] [stderr]     Checking tokio-udp v0.1.0
[INFO] [stderr]     Checking tokio-fs v0.1.0
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking tokio v0.1.6
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]    Compiling enum-map-derive v0.2.5
[INFO] [stderr]     Checking enum-map v0.2.29
[INFO] [stderr]     Checking toml v0.4.6
[INFO] [stderr]     Checking cursive v0.9.0-alpha.0 (https://github.com/gyscos/Cursive#4a3bbbb9)
[INFO] [stderr]     Checking multihash v0.7.0
[INFO] [stderr]     Checking cid v0.2.3
[INFO] [stderr]     Checking multiaddr v0.3.0
[INFO] [stderr]     Checking murmur v0.1.0 (https://github.com/alanwilhelm/murmur#26ad0148)
[INFO] [stderr]  Documenting starling 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(iterator_step_by)]
[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 `starling`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name starling 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 cursive=/opt/rustwide/target/debug/deps/libcursive-493729d4fd0c2b19.rmeta --extern easy_hash=/opt/rustwide/target/debug/deps/libeasy_hash-bef8031a705fc45f.rmeta --extern murmur=/opt/rustwide/target/debug/deps/libmurmur-cd42d833dc9558ce.rmeta --extern crypto=/opt/rustwide/target/debug/deps/libcrypto-c24be1c4dfb609a6.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "2c79b7ff0d8986721f9ce4688e2ca0f7442bf8c95086d30dbb4bfd59c5418576", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c79b7ff0d8986721f9ce4688e2ca0f7442bf8c95086d30dbb4bfd59c5418576", kill_on_drop: false }`
[INFO] [stdout] 2c79b7ff0d8986721f9ce4688e2ca0f7442bf8c95086d30dbb4bfd59c5418576