[INFO] cloning repository https://github.com/liryanne/git-auto-sync
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/liryanne/git-auto-sync" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fliryanne%2Fgit-auto-sync", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fliryanne%2Fgit-auto-sync'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 915ee615b06190ae607e77719d2e04c55514c805
[INFO] documenting liryanne/git-auto-sync 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%2Fliryanne%2Fgit-auto-sync" "/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/liryanne/git-auto-sync 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/liryanne/git-auto-sync
[INFO] finished tweaking git repo https://github.com/liryanne/git-auto-sync
[INFO] tweaked toml for git repo https://github.com/liryanne/git-auto-sync written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/liryanne/git-auto-sync 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] 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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db3474dd7abb1cda6c9b80961007cc5b9cede493d5805b22ccff8d00f8ab9e4f
[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" "db3474dd7abb1cda6c9b80961007cc5b9cede493d5805b22ccff8d00f8ab9e4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db3474dd7abb1cda6c9b80961007cc5b9cede493d5805b22ccff8d00f8ab9e4f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db3474dd7abb1cda6c9b80961007cc5b9cede493d5805b22ccff8d00f8ab9e4f", kill_on_drop: false }`
[INFO] [stdout] db3474dd7abb1cda6c9b80961007cc5b9cede493d5805b22ccff8d00f8ab9e4f
[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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f4a5b8711c90da2e6df3c5dfa5a918efb5814acb88fb15253b2ec6c47bf3822e
[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" "f4a5b8711c90da2e6df3c5dfa5a918efb5814acb88fb15253b2ec6c47bf3822e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]    Compiling cpal v0.11.0
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking claxon v0.4.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking ogg v0.7.0
[INFO] [stderr]     Checking lewton v0.10.1
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking termios v0.3.2
[INFO] [stderr]     Checking net2 v0.2.34
[INFO] [stderr]     Checking terminal_size v0.1.12
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking alsa-sys v0.1.2
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking slice-deque v0.3.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking signal-hook-registry v1.2.0
[INFO] [stderr]     Checking pathsearch v0.2.0
[INFO] [stderr]     Checking num-integer v0.1.43
[INFO] [stderr]     Checking dirs v2.0.2
[INFO] [stderr]    Compiling cc v1.0.54
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking syncbox v0.2.4
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]     Checking eventual v0.1.7
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling libssh2-sys v0.2.17
[INFO] [stderr]    Compiling minimp3-sys v0.3.2
[INFO] [stderr]    Compiling libgit2-sys v0.12.7+1.0.0
[INFO] [stderr]     Checking tokio v0.2.21
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking minimp3 v0.3.5
[INFO] [stderr]     Checking rodio v0.11.0
[INFO] [stderr]     Checking console v0.11.3
[INFO] [stderr]     Checking dialoguer v0.6.2
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking git2 v0.13.6
[INFO] [stderr]     Checking git2_credentials v0.6.1
[INFO] [stderr]  Documenting git-auto-sync v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(exact_size_is_empty)]
[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 `git-auto-sync`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name git_auto_sync 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 chrono=/opt/rustwide/target/debug/deps/libchrono-d243100d814c5dc4.rmeta --extern eventual=/opt/rustwide/target/debug/deps/libeventual-6c957f6c9a4f250f.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-3d4b120b75b14166.rmeta --extern git2_credentials=/opt/rustwide/target/debug/deps/libgit2_credentials-73cbae970d93e4d0.rmeta --extern pathsearch=/opt/rustwide/target/debug/deps/libpathsearch-4c12a042829972e9.rmeta --extern rodio=/opt/rustwide/target/debug/deps/librodio-50ce2233c65059a6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-79ca0b8996df21f1.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-4a8d667195b7aebe.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-18aa137498771899.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "f4a5b8711c90da2e6df3c5dfa5a918efb5814acb88fb15253b2ec6c47bf3822e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4a5b8711c90da2e6df3c5dfa5a918efb5814acb88fb15253b2ec6c47bf3822e", kill_on_drop: false }`
[INFO] [stdout] f4a5b8711c90da2e6df3c5dfa5a918efb5814acb88fb15253b2ec6c47bf3822e