[INFO] cloning repository https://github.com/elba/elba
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/elba/elba" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felba%2Felba", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felba%2Felba'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a16b0c123ebe00b6b613587fc45aabc318430d71
[INFO] documenting elba/elba against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felba%2Felba" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/elba/elba on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/elba/elba
[INFO] finished tweaking git repo https://github.com/elba/elba
[INFO] tweaked toml for git repo https://github.com/elba/elba written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/elba/elba already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d39afefad85e3b00bedced4af4098a9652cc93cab382648edf8f88caee86d8f
[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" "8d39afefad85e3b00bedced4af4098a9652cc93cab382648edf8f88caee86d8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d39afefad85e3b00bedced4af4098a9652cc93cab382648edf8f88caee86d8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d39afefad85e3b00bedced4af4098a9652cc93cab382648edf8f88caee86d8f", kill_on_drop: false }`
[INFO] [stdout] 8d39afefad85e3b00bedced4af4098a9652cc93cab382648edf8f88caee86d8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+1.46.0" "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] c314bb9ed6cfbc34040435b7509d2eefe7db66ca5f003e636dd00d30aa2a1fd5
[INFO] running `Command { std: "docker" "start" "-a" "c314bb9ed6cfbc34040435b7509d2eefe7db66ca5f003e636dd00d30aa2a1fd5", kill_on_drop: false }`
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking shell-escape v0.1.4
[INFO] [stderr]     Checking symlink v0.1.0
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking simsearch v0.2.0
[INFO] [stderr]     Checking crossbeam-channel v0.3.9
[INFO] [stderr]     Checking encoding_rs v0.8.22
[INFO] [stderr]     Checking bstr v0.2.11
[INFO] [stderr]     Checking crossbeam-epoch v0.5.2
[INFO] [stderr]     Checking crossbeam-epoch v0.6.1
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking parking_lot_core v0.7.0
[INFO] [stderr]     Checking xattr v0.2.2
[INFO] [stderr]     Checking filetime v0.2.8
[INFO] [stderr]     Checking clicolors-control v0.2.0
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking directories v1.0.2
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking crossbeam-deque v0.5.2
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]     Checking tar v0.4.26
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking slog-async v2.4.0
[INFO] [stderr]     Checking slog-term v2.5.0
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]    Compiling openssl-src v111.9.0+1.1.1g
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]     Checking globset v0.4.4
[INFO] [stderr]     Checking Inflector v0.11.4
[INFO] [stderr]     Checking console v0.6.2
[INFO] [stderr]     Checking tokio v0.2.13
[INFO] [stderr]    Compiling openssl-sys v0.9.54
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling backtrace-sys v0.1.33
[INFO] [stderr]    Compiling libssh2-sys v0.2.16
[INFO] [stderr]    Compiling libgit2-sys v0.11.0+0.99.0
[INFO] [stderr]     Checking ignore v0.4.11
[INFO] [stderr]     Checking backtrace v0.3.41
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking indexmap v1.3.2
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking h2 v0.2.2
[INFO] [stderr]     Checking semver_constraints v0.1.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling lexical-core v0.6.7
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking hyper v0.13.3
[INFO] [stderr]     Checking crossbeam-channel v0.2.6
[INFO] [stderr]     Checking crossbeam v0.4.1
[INFO] [stderr]     Checking nom v5.1.1
[INFO] [stderr]     Checking config v0.10.1
[INFO] [stderr]    Compiling openssl v0.10.28
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking git2 v0.12.0
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking reqwest v0.10.4
[INFO] [stderr]  Documenting elba v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(label_break_value)]
[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 `elba`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name elba src/lib/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 inflector=/opt/rustwide/target/debug/deps/libinflector-d110358ebeb46f63.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-d4a587b550fd2910.rmeta --extern config=/opt/rustwide/target/debug/deps/libconfig-eff64d504e1343c1.rmeta --extern console=/opt/rustwide/target/debug/deps/libconsole-35aae288da4c555d.rmeta --extern crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-e7e6117900f6d1d7.rmeta --extern digest=/opt/rustwide/target/debug/deps/libdigest-aabdcb1ff2ee1f0d.rmeta --extern directories=/opt/rustwide/target/debug/deps/libdirectories-2e36df4cecc6f215.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-93c4aa501ad12e85.rmeta --extern flate2=/opt/rustwide/target/debug/deps/libflate2-9e2a5acd34c6e641.rmeta --extern fs2=/opt/rustwide/target/debug/deps/libfs2-c3fd841d441c83d0.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-d1e0ed66beaab086.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-2868a8342e32c098.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-88b93a2a096ee79e.rmeta --extern ignore=/opt/rustwide/target/debug/deps/libignore-e70a01e0506e6d1d.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-b773e65b07beace5.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-bf3f23fab58501db.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-f7c1fa64da25474e.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-061f46a1a04ce064.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-ebfcd7c9b356976f.rmeta --extern petgraph=/opt/rustwide/target/debug/deps/libpetgraph-2849dc170b4d8716.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-479a918a29547685.rmeta --extern remove_dir_all=/opt/rustwide/target/debug/deps/libremove_dir_all-d4dbab7dff54bf76.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-4cb2bf92d92f8656.rmeta --extern scoped_threadpool=/opt/rustwide/target/debug/deps/libscoped_threadpool-64fb84bc1deb38e7.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-645183dff9e74bba.rmeta --extern semver_constraints=/opt/rustwide/target/debug/deps/libsemver_constraints-76064eeb7b3198ee.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-146b819892e70d70.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-c1eddc6da79487da.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-d0ed051dd5b804bb.rmeta --extern shell_escape=/opt/rustwide/target/debug/deps/libshell_escape-c05c22bf50d5488c.rmeta --extern simsearch=/opt/rustwide/target/debug/deps/libsimsearch-0469b51a60d1af94.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-cdf337398563f389.rmeta --extern slog_async=/opt/rustwide/target/debug/deps/libslog_async-770a4ec25a1f053b.rmeta --extern slog_term=/opt/rustwide/target/debug/deps/libslog_term-7f9f5c5d3c5001d3.rmeta --extern symlink=/opt/rustwide/target/debug/deps/libsymlink-65ae1f31f3ae4611.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-e896f9d501e5a174.rmeta --extern textwrap=/opt/rustwide/target/debug/deps/libtextwrap-7d040897afef5c84.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-3fc99deaea4c2307.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-03b5166b7680332f.rmeta --extern toml_edit=/opt/rustwide/target/debug/deps/libtoml_edit-d0a2a5803ccc0a3b.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-da4f37f213157002.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-72ead3ebf3ce29a8.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "c314bb9ed6cfbc34040435b7509d2eefe7db66ca5f003e636dd00d30aa2a1fd5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c314bb9ed6cfbc34040435b7509d2eefe7db66ca5f003e636dd00d30aa2a1fd5", kill_on_drop: false }`
[INFO] [stdout] c314bb9ed6cfbc34040435b7509d2eefe7db66ca5f003e636dd00d30aa2a1fd5