[INFO] cloning repository https://github.com/MakotoE/rust-fah-pauser
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MakotoE/rust-fah-pauser" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMakotoE%2Frust-fah-pauser", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMakotoE%2Frust-fah-pauser'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ba60a7dcef995a2b563415a8201769c263d5cd59
[INFO] documenting MakotoE/rust-fah-pauser against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMakotoE%2Frust-fah-pauser" "/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/MakotoE/rust-fah-pauser on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MakotoE/rust-fah-pauser
[INFO] finished tweaking git repo https://github.com/MakotoE/rust-fah-pauser
[INFO] tweaked toml for git repo https://github.com/MakotoE/rust-fah-pauser written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/MakotoE/rust-fah-pauser already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bencher v0.1.5
[INFO] [stderr]   Downloaded parse_duration v2.1.0
[INFO] [stderr]   Downloaded backtrace v0.3.41
[INFO] [stderr]   Downloaded dirs v3.0.0
[INFO] [stderr]   Downloaded fahapi v0.1.1
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aa8a32587617dfc536c620296f03b598892b3767a7cd0a144291e331a8272785
[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" "aa8a32587617dfc536c620296f03b598892b3767a7cd0a144291e331a8272785", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa8a32587617dfc536c620296f03b598892b3767a7cd0a144291e331a8272785", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa8a32587617dfc536c620296f03b598892b3767a7cd0a144291e331a8272785", kill_on_drop: false }`
[INFO] [stdout] aa8a32587617dfc536c620296f03b598892b3767a7cd0a144291e331a8272785
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] fc2c70fd7617f38ffca66e19a79a4182badb5c658d9f7005d5a38bd1053a26ef
[INFO] running `Command { std: "docker" "start" "-a" "fc2c70fd7617f38ffca66e19a79a4182badb5c658d9f7005d5a38bd1053a26ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.55
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling winapi v0.3.9
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking bencher v0.1.5
[INFO] [stderr]    Compiling error-chain v0.12.2
[INFO] [stderr]     Checking yaml-rust v0.4.4
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking dirs v3.0.0
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]     Checking parse_duration v2.1.0
[INFO] [stderr]     Checking backtrace v0.3.41
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking serde v1.0.114
[INFO] [stderr]     Checking serde_json v1.0.55
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]     Checking fahapi v0.1.1
[INFO] [stderr]  Documenting fah-pauser 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:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `fah-pauser`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name fah_pauser src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=e4b1639b79da688e -L dependency=/opt/rustwide/target/debug/deps --extern dirs=/opt/rustwide/target/debug/deps/libdirs-d1d6229bf5669fde.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-18126c1eaa976ec2.rmeta --extern fahapi=/opt/rustwide/target/debug/deps/libfahapi-3481f07618eab697.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5fe8e34dd9ee7c9e.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-4f8183140eb94148.rmeta --extern winapi=/opt/rustwide/target/debug/deps/libwinapi-013565e9e3b5b7ef.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fc2c70fd7617f38ffca66e19a79a4182badb5c658d9f7005d5a38bd1053a26ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc2c70fd7617f38ffca66e19a79a4182badb5c658d9f7005d5a38bd1053a26ef", kill_on_drop: false }`
[INFO] [stdout] fc2c70fd7617f38ffca66e19a79a4182badb5c658d9f7005d5a38bd1053a26ef