[INFO] fetching crate brewmaster 0.1.0...
[INFO] documenting brewmaster-0.1.0 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate brewmaster 0.1.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate brewmaster 0.1.0 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] started tweaking crates.io crate brewmaster 0.1.0
[INFO] finished tweaking crates.io crate brewmaster 0.1.0
[INFO] tweaked toml for crates.io crate brewmaster 0.1.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate brewmaster 0.1.0 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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 2274fff8dff28ae90181068dbeeef67f852ef1462ff36b59a25a7cb3affb9368
[INFO] running `Command { std: "docker" "start" "-a" "2274fff8dff28ae90181068dbeeef67f852ef1462ff36b59a25a7cb3affb9368", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2274fff8dff28ae90181068dbeeef67f852ef1462ff36b59a25a7cb3affb9368", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2274fff8dff28ae90181068dbeeef67f852ef1462ff36b59a25a7cb3affb9368", kill_on_drop: false }`
[INFO] [stdout] 2274fff8dff28ae90181068dbeeef67f852ef1462ff36b59a25a7cb3affb9368
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] 6d1f177fbaf69e595c7c7c88b9f4085193038201d82c006511e592a55cb6d471
[INFO] running `Command { std: "docker" "start" "-a" "6d1f177fbaf69e595c7c7c88b9f4085193038201d82c006511e592a55cb6d471", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]    Compiling const_fn v0.4.5
[INFO] [stderr]     Checking regex-syntax v0.6.22
[INFO] [stderr]    Compiling serde_derive v1.0.123
[INFO] [stderr]     Checking gimli v0.23.0
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]     Checking rustc-demangle v0.1.18
[INFO] [stderr]    Compiling serde v1.0.123
[INFO] [stderr]     Checking object v0.23.0
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking dtoa v0.4.7
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling libc v0.2.86
[INFO] [stderr]     Checking bstr v0.2.15
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking filetime v0.2.14
[INFO] [stderr]     Checking xattr v0.2.2
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]     Checking flate2 v1.0.20
[INFO] [stderr]     Checking tar v0.4.32
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]     Checking crossbeam-epoch v0.9.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]    Compiling openssl-sys v0.9.60
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling libssh2-sys v0.2.21
[INFO] [stderr]    Compiling libgit2-sys v0.12.18+1.1.0
[INFO] [stderr]     Checking regex v1.4.3
[INFO] [stderr]     Checking addr2line v0.14.1
[INFO] [stderr]     Checking backtrace v0.3.56
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking globset v0.4.6
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking ignore v0.4.17
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking globwalk v0.3.1
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking git2 v0.13.17
[INFO] [stderr]     Checking exitfailure v0.5.1
[INFO] [stderr]     Checking clap-verbosity-flag v0.2.0
[INFO] [stderr]     Checking quicli v0.4.0
[INFO] [stderr]     Checking serde_yaml v0.8.17
[INFO] [stderr]     Checking semver v0.10.0
[INFO] [stderr]  Documenting brewmaster 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(str_split_as_str)]
[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 `brewmaster`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name brewmaster 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 flate2=/opt/rustwide/target/debug/deps/libflate2-accbf3f45b4406be.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-959c4b51e07d003f.rmeta --extern quicli=/opt/rustwide/target/debug/deps/libquicli-760b23653f5bec8c.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-3880e77ad64b2f8a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7a77303dc5c27cd3.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-2a307c1cd5edd016.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-26749a49ee27ef66.rmeta --extern tar=/opt/rustwide/target/debug/deps/libtar-a4b2c92ca3d4e10e.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-39eacce3f3a3d1f1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6d1f177fbaf69e595c7c7c88b9f4085193038201d82c006511e592a55cb6d471", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d1f177fbaf69e595c7c7c88b9f4085193038201d82c006511e592a55cb6d471", kill_on_drop: false }`
[INFO] [stdout] 6d1f177fbaf69e595c7c7c88b9f4085193038201d82c006511e592a55cb6d471
