[INFO] cloning repository https://github.com/sozu-proxy/keepalive-bench
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sozu-proxy/keepalive-bench" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsozu-proxy%2Fkeepalive-bench", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsozu-proxy%2Fkeepalive-bench'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ae1d1e142865e4b4c83f4f9a1def2470ef81e518
[INFO] documenting sozu-proxy/keepalive-bench 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%2Fsozu-proxy%2Fkeepalive-bench" "/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/sozu-proxy/keepalive-bench 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/sozu-proxy/keepalive-bench
[INFO] finished tweaking git repo https://github.com/sozu-proxy/keepalive-bench
[INFO] tweaked toml for git repo https://github.com/sozu-proxy/keepalive-bench written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/sozu-proxy/keepalive-bench 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 csv-core v0.1.3
[INFO] [stderr]   Downloaded pretty_env_logger v0.1.1
[INFO] [stderr]   Downloaded csv v1.0.0-beta.5
[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] d7c2b5409a739162e9e3cb43f708db6967f95d9750a73a4e5a02fd217488b010
[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" "d7c2b5409a739162e9e3cb43f708db6967f95d9750a73a4e5a02fd217488b010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d7c2b5409a739162e9e3cb43f708db6967f95d9750a73a4e5a02fd217488b010", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d7c2b5409a739162e9e3cb43f708db6967f95d9750a73a4e5a02fd217488b010", kill_on_drop: false }`
[INFO] [stdout] d7c2b5409a739162e9e3cb43f708db6967f95d9750a73a4e5a02fd217488b010
[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] 6c795f230e75a4c2da7fa50501a15e79e091d631751de788825df30dd34eb349
[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" "6c795f230e75a4c2da7fa50501a15e79e091d631751de788825df30dd34eb349", kill_on_drop: false }`
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]     Checking futures v0.1.17
[INFO] [stderr]     Checking byteorder v1.1.0
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking lazy_static v0.2.9
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking lazycell v0.5.1
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking safemem v0.2.0
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking serde v1.0.19
[INFO] [stderr]     Checking httparse v1.2.3
[INFO] [stderr]     Checking percent-encoding v1.0.0
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking iovec v0.1.1
[INFO] [stderr]     Checking memchr v1.0.2
[INFO] [stderr]     Checking rand v0.3.17
[INFO] [stderr]     Checking num_cpus v1.7.0
[INFO] [stderr]     Checking time v0.1.38
[INFO] [stderr]     Checking net2 v0.2.31
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]     Checking csv-core v0.1.3
[INFO] [stderr]     Checking thread_local v0.3.4
[INFO] [stderr]     Checking bytes v0.4.5
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]     Checking mio v0.6.11
[INFO] [stderr]    Compiling unicase v2.0.0
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]     Checking mime v0.3.5
[INFO] [stderr]     Checking tokio-io v0.1.3
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking futures-cpupool v0.1.7
[INFO] [stderr]     Checking relay v0.1.0
[INFO] [stderr]     Checking tokio-core v0.1.10
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking pretty_env_logger v0.1.1
[INFO] [stderr]     Checking tokio-proto v0.1.1
[INFO] [stderr]     Checking hyper v0.11.6 (https://github.com/hyperium/hyper#d3b19112)
[INFO] [stderr]     Checking csv v1.0.0-beta.5
[INFO] [stderr]  Documenting proxy-benchmark 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(conservative_impl_trait)]
[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 `proxy-benchmark`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name proxy_benchmark 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 csv=/opt/rustwide/target/debug/deps/libcsv-98e6583aec1ba4e9.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-f22c15f417d1d083.rmeta --extern futures_cpupool=/opt/rustwide/target/debug/deps/libfutures_cpupool-fd99ba9a955f809c.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-96ad9fcf332db596.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-a955ebed0a5abea5.rmeta --extern tokio_core=/opt/rustwide/target/debug/deps/libtokio_core-a5258d7399af06fa.rmeta --extern tokio_io=/opt/rustwide/target/debug/deps/libtokio_io-24de73cc8e3a604e.rmeta --extern tokio_proto=/opt/rustwide/target/debug/deps/libtokio_proto-d79e9134dc276c2c.rmeta --extern tokio_service=/opt/rustwide/target/debug/deps/libtokio_service-97327f53ef64ba03.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "6c795f230e75a4c2da7fa50501a15e79e091d631751de788825df30dd34eb349", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c795f230e75a4c2da7fa50501a15e79e091d631751de788825df30dd34eb349", kill_on_drop: false }`
[INFO] [stdout] 6c795f230e75a4c2da7fa50501a15e79e091d631751de788825df30dd34eb349