[INFO] cloning repository https://github.com/belfz/mpsc-crypto-mining
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/belfz/mpsc-crypto-mining" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbelfz%2Fmpsc-crypto-mining", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbelfz%2Fmpsc-crypto-mining'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 893c34f913ae79e8cfff5b36fe12d1dd432ab148
[INFO] documenting belfz/mpsc-crypto-mining against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbelfz%2Fmpsc-crypto-mining" "/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/belfz/mpsc-crypto-mining on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/belfz/mpsc-crypto-mining
[INFO] finished tweaking git repo https://github.com/belfz/mpsc-crypto-mining
[INFO] tweaked toml for git repo https://github.com/belfz/mpsc-crypto-mining written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/belfz/mpsc-crypto-mining already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded digest v0.4.0
[INFO] [stderr]   Downloaded digest-buffer v0.2.0
[INFO] [stderr]   Downloaded easy-hash v0.1.0
[INFO] [stderr]   Downloaded byte-tools v0.1.3
[INFO] [stderr]   Downloaded generic-array v0.6.0
[INFO] [stderr]   Downloaded sha2 v0.4.2
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b399d58caac2b265971fe312a08302ad0ff7aa80861fc24be81161c57c3cf18b
[INFO] running `Command { std: "docker" "start" "-a" "b399d58caac2b265971fe312a08302ad0ff7aa80861fc24be81161c57c3cf18b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b399d58caac2b265971fe312a08302ad0ff7aa80861fc24be81161c57c3cf18b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b399d58caac2b265971fe312a08302ad0ff7aa80861fc24be81161c57c3cf18b", kill_on_drop: false }`
[INFO] [stdout] b399d58caac2b265971fe312a08302ad0ff7aa80861fc24be81161c57c3cf18b
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbb2b717cb31c02b6b45b3ac3b249d567a4629f4d89561f96c7cfc269bc7ea37
[INFO] running `Command { std: "docker" "start" "-a" "bbb2b717cb31c02b6b45b3ac3b249d567a4629f4d89561f96c7cfc269bc7ea37", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.9.0
[INFO] [stderr]     Checking odds v0.2.25
[INFO] [stderr]     Checking byte-tools v0.1.3
[INFO] [stderr]     Checking nodrop v0.1.10
[INFO] [stderr]     Checking generic-array v0.6.0
[INFO] [stderr]     Checking digest-buffer v0.2.0
[INFO] [stderr]     Checking digest v0.4.0
[INFO] [stderr]     Checking sha2 v0.4.2
[INFO] [stderr]     Checking easy-hash v0.1.0
[INFO] [stderr]  Documenting mpsc-crypto-mining 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(iterator_step_by)]
[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 `mpsc-crypto-mining`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name mpsc_crypto_mining 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 easy_hash=/opt/rustwide/target/debug/deps/libeasy_hash-945d12b04d45e3fd.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bbb2b717cb31c02b6b45b3ac3b249d567a4629f4d89561f96c7cfc269bc7ea37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbb2b717cb31c02b6b45b3ac3b249d567a4629f4d89561f96c7cfc269bc7ea37", kill_on_drop: false }`
[INFO] [stdout] bbb2b717cb31c02b6b45b3ac3b249d567a4629f4d89561f96c7cfc269bc7ea37
