[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 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%2Felba%2Felba" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/elba/elba 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/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-4/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slog-async v2.4.0
[INFO] [stderr]   Downloaded fwdansi v1.1.0
[INFO] [stderr]   Downloaded regex-syntax v0.6.16
[INFO] [stderr]   Downloaded slog-term v2.5.0
[INFO] [stderr]   Downloaded libssh2-sys v0.2.16
[INFO] [stderr]   Downloaded git2 v0.12.0
[INFO] [stderr]   Downloaded libgit2-sys v0.11.0+0.99.0
[INFO] [stderr]   Downloaded openssl-src v111.9.0+1.1.1g
[INFO] [stderr]   Downloaded simsearch v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 357138b3f59712bdcbd060708be9bfa2a8135668bbed8480da101a9371f2114c
[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" "357138b3f59712bdcbd060708be9bfa2a8135668bbed8480da101a9371f2114c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "357138b3f59712bdcbd060708be9bfa2a8135668bbed8480da101a9371f2114c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "357138b3f59712bdcbd060708be9bfa2a8135668bbed8480da101a9371f2114c", kill_on_drop: false }`
[INFO] [stdout] 357138b3f59712bdcbd060708be9bfa2a8135668bbed8480da101a9371f2114c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 9aea00c2dc4950ae84b86ada8381c0046b618cdcfff9c98049a39117fbfa0998
[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" "9aea00c2dc4950ae84b86ada8381c0046b618cdcfff9c98049a39117fbfa0998", kill_on_drop: false }`
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking symlink v0.1.0
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking simsearch v0.2.0
[INFO] [stderr]     Checking encoding_rs v0.8.22
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking bstr v0.2.11
[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 fs2 v0.4.3
[INFO] [stderr]     Checking directories v1.0.2
[INFO] [stderr]     Checking crossbeam-epoch v0.5.2
[INFO] [stderr]     Checking crossbeam-epoch v0.6.1
[INFO] [stderr]     Checking flate2 v1.0.13
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking combine v3.8.1
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]     Checking Inflector v0.11.4
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking parking_lot v0.10.0
[INFO] [stderr]    Compiling failure_derive v0.1.7
[INFO] [stderr]     Checking tar v0.4.26
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]     Checking term v0.6.1
[INFO] [stderr]     Checking indexmap v1.3.2
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]     Checking crossbeam-deque v0.5.2
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking globset v0.4.4
[INFO] [stderr]     Checking console v0.6.2
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]    Compiling openssl-src v111.9.0+1.1.1g
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio v0.2.13
[INFO] [stderr]     Checking ignore v0.4.11
[INFO] [stderr]     Checking slog-term v2.5.0
[INFO] [stderr]     Checking slog-async v2.4.0
[INFO] [stderr]    Compiling openssl-sys v0.9.54
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling libssh2-sys v0.2.16
[INFO] [stderr]    Compiling backtrace-sys v0.1.33
[INFO] [stderr]    Compiling libgit2-sys v0.11.0+0.99.0
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]     Checking backtrace v0.3.41
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking semver_constraints v0.1.0
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]     Checking h2 v0.2.2
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking toml_edit v0.1.5
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling lexical-core v0.6.7
[INFO] [stderr]     Checking hyper v0.13.3
[INFO] [stderr]     Checking parking_lot v0.6.4
[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 tokio-tls v0.3.0
[INFO] [stderr]     Checking git2 v0.12.0
[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 beta 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-fb91c3faba76a22d.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-b4b89f0c67c0177b.rmeta --extern config=/opt/rustwide/target/debug/deps/libconfig-c2eaeb0a94e13559.rmeta --extern console=/opt/rustwide/target/debug/deps/libconsole-7be97c2c17530b4d.rmeta --extern crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-aad088e63bab22e0.rmeta --extern digest=/opt/rustwide/target/debug/deps/libdigest-e319d12dd6b1c3c4.rmeta --extern directories=/opt/rustwide/target/debug/deps/libdirectories-18697ebfcd0a34ff.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-d0fa18e31c7b2c27.rmeta --extern flate2=/opt/rustwide/target/debug/deps/libflate2-d5804db47d048724.rmeta --extern fs2=/opt/rustwide/target/debug/deps/libfs2-fcd6daa1e966d804.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-024caa8fca498166.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-0cea8c2288139f5b.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-b38b297ae8f34fd9.rmeta --extern ignore=/opt/rustwide/target/debug/deps/libignore-26c4ebdf395932b3.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-cbb056a05f080748.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-4a929f4b93e76cd9.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-1877ec3cbd3ab3ce.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-aa60f48bf25f8ec1.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-81fecfba339e8232.rmeta --extern petgraph=/opt/rustwide/target/debug/deps/libpetgraph-fb44018744abe070.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-a3c51b1fd0b8f7fa.rmeta --extern remove_dir_all=/opt/rustwide/target/debug/deps/libremove_dir_all-f11eda0342ae16fb.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-4a1e88be956c607c.rmeta --extern scoped_threadpool=/opt/rustwide/target/debug/deps/libscoped_threadpool-c264290d6b37b518.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-ae11223b01485b0f.rmeta --extern semver_constraints=/opt/rustwide/target/debug/deps/libsemver_constraints-3ff3fe1fdf0e8fc7.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-e45547add2e67443.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-2dc8913517537d6e.rmeta --extern sha2=/opt/rustwide/target/debug/deps/libsha2-b048a8ab38fed3db.rmeta --extern shell_escape=/opt/rustwide/target/debug/deps/libshell_escape-6df100444d976cc4.rmeta --extern simsearch=/opt/rustwide/target/debug/deps/libsimsearch-fac2b4e782ded19c.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-033f4152db95de0c.rmeta --extern slog_async=/opt/rustwide/target/debug/deps/libslog_async-9b2f837e16ea92e3.rmeta --extern slog_term=/opt/rustwide/target/debug/deps/libslog_term-d5a3e6ea01c91392.rmeta --extern symlink=/opt/rustwide/target/debug/deps/libsymlink-2f79ce91dd22516b.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-d972716db8019591.rmeta --extern textwrap=/opt/rustwide/target/debug/deps/libtextwrap-fbdc7b8302d87e38.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-e3b059ed09b9c9f8.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-5448436b752f5711.rmeta --extern toml_edit=/opt/rustwide/target/debug/deps/libtoml_edit-71c6bb9ae0dc2688.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-4a464d78bb4d0ee4.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-37c1eba6428ea4cb.rmeta --cap-lints=warn --crate-version 0.3.3` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9aea00c2dc4950ae84b86ada8381c0046b618cdcfff9c98049a39117fbfa0998", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9aea00c2dc4950ae84b86ada8381c0046b618cdcfff9c98049a39117fbfa0998", kill_on_drop: false }`
[INFO] [stdout] 9aea00c2dc4950ae84b86ada8381c0046b618cdcfff9c98049a39117fbfa0998