[INFO] cloning repository https://github.com/safinsingh/bors
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/safinsingh/bors" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsafinsingh%2Fbors", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsafinsingh%2Fbors'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7e3982b0ff7d51415e8b47e53484201df429ba71
[INFO] documenting safinsingh/bors against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsafinsingh%2Fbors" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/safinsingh/bors on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-1/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/safinsingh/bors
[INFO] finished tweaking git repo https://github.com/safinsingh/bors
[INFO] tweaked toml for git repo https://github.com/safinsingh/bors written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/safinsingh/bors already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90df7d6ea4fab5d527184199b4dae7d369786941ca10f8d96ccff9a06d3d35d2
[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" "90df7d6ea4fab5d527184199b4dae7d369786941ca10f8d96ccff9a06d3d35d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90df7d6ea4fab5d527184199b4dae7d369786941ca10f8d96ccff9a06d3d35d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90df7d6ea4fab5d527184199b4dae7d369786941ca10f8d96ccff9a06d3d35d2", kill_on_drop: false }`
[INFO] [stdout] 90df7d6ea4fab5d527184199b4dae7d369786941ca10f8d96ccff9a06d3d35d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc696d72b7c0e43312427a8da21fab3666ebfe59abf53b64c12c5b20c5bf3af8
[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" "dc696d72b7c0e43312427a8da21fab3666ebfe59abf53b64c12c5b20c5bf3af8", kill_on_drop: false }`
[INFO] [stderr]    Compiling serenity v0.9.1
[INFO] [stderr]     Checking typemap_rev v0.1.4
[INFO] [stderr]    Compiling ring v0.16.15
[INFO] [stderr]     Checking signal-hook-registry v1.2.2
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]    Compiling tracing-attributes v0.1.11
[INFO] [stderr]     Checking flate2 v1.0.19
[INFO] [stderr]     Checking crossbeam-epoch v0.9.0
[INFO] [stderr]    Compiling async-trait v0.1.41
[INFO] [stderr]    Compiling command_attr v0.3.1
[INFO] [stderr]     Checking colored v2.0.0
[INFO] [stderr]     Checking futures-util v0.3.8
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking tungstenite v0.11.1
[INFO] [stderr]     Checking parking_lot v0.11.0
[INFO] [stderr]     Checking sled v0.34.6
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking tokio v0.2.23
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]     Checking tracing-futures v0.2.4
[INFO] [stderr]     Checking futures-executor v0.3.8
[INFO] [stderr]     Checking webpki v0.21.3
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]     Checking futures v0.3.8
[INFO] [stderr]     Checking rustls v0.18.1
[INFO] [stderr]     Checking webpki-roots v0.20.0
[INFO] [stderr]     Checking webpki-roots v0.19.0
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking h2 v0.2.7
[INFO] [stderr]     Checking tokio-rustls v0.14.1
[INFO] [stderr]     Checking async-tungstenite v0.9.3
[INFO] [stderr]     Checking hyper v0.13.9
[INFO] [stderr]     Checking hyper-rustls v0.21.0
[INFO] [stderr]     Checking reqwest v0.10.8
[INFO] [stderr]  Documenting bors v0.2.0 (/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(async_closure)]
[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 `bors`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name bors 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 anyhow=/opt/rustwide/target/debug/deps/libanyhow-718594274c3f0e79.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-2e06ff25840800fd.rmeta --extern colored=/opt/rustwide/target/debug/deps/libcolored-ac03e559efd0f927.rmeta --extern dotenv=/opt/rustwide/target/debug/deps/libdotenv-fac2af56d99fafd7.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-dbf3d750edb3cecc.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern lazysort=/opt/rustwide/target/debug/deps/liblazysort-5cd59df859382105.rmeta --extern serenity=/opt/rustwide/target/debug/deps/libserenity-87bc34f31ab16c2a.rmeta --extern sled=/opt/rustwide/target/debug/deps/libsled-9087abb6ac638895.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-0a688833add924df.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "dc696d72b7c0e43312427a8da21fab3666ebfe59abf53b64c12c5b20c5bf3af8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc696d72b7c0e43312427a8da21fab3666ebfe59abf53b64c12c5b20c5bf3af8", kill_on_drop: false }`
[INFO] [stdout] dc696d72b7c0e43312427a8da21fab3666ebfe59abf53b64c12c5b20c5bf3af8
