[INFO] fetching crate jujube-lib 0.1.1...
[INFO] documenting jujube-lib-0.1.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate jujube-lib 0.1.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate jujube-lib 0.1.1 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 jujube-lib 0.1.1
[INFO] finished tweaking crates.io crate jujube-lib 0.1.1
[INFO] tweaked toml for crates.io crate jujube-lib 0.1.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 9a6111ac4b2b7ce72f64b0f1a449c8ae535efa110341287a84bb01f78ed79d36
[INFO] running `Command { std: "docker" "start" "-a" "9a6111ac4b2b7ce72f64b0f1a449c8ae535efa110341287a84bb01f78ed79d36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a6111ac4b2b7ce72f64b0f1a449c8ae535efa110341287a84bb01f78ed79d36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a6111ac4b2b7ce72f64b0f1a449c8ae535efa110341287a84bb01f78ed79d36", kill_on_drop: false }`
[INFO] [stdout] 9a6111ac4b2b7ce72f64b0f1a449c8ae535efa110341287a84bb01f78ed79d36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] ab0ae2def6c196cfd8b91b075157b78035f449e33d69113150a8c15d0b4c7688
[INFO] running `Command { std: "docker" "start" "-a" "ab0ae2def6c196cfd8b91b075157b78035f449e33d69113150a8c15d0b4c7688", kill_on_drop: false }`
[INFO] [stderr]    Compiling protobuf v2.25.0
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]    Compiling zstd-safe v3.0.1+zstd.1.4.9
[INFO] [stderr]    Compiling whoami v1.1.2
[INFO] [stderr]     Checking rust-ini v0.13.0
[INFO] [stderr]     Checking diff v0.1.12
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking num-integer v0.1.44
[INFO] [stderr]     Checking nom v5.1.2
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]    Compiling openssl-sys v0.9.65
[INFO] [stderr]    Compiling libz-sys v1.1.3
[INFO] [stderr]    Compiling libssh2-sys v0.2.21
[INFO] [stderr]    Compiling zstd-sys v1.4.20+zstd.1.4.9
[INFO] [stderr]    Compiling libgit2-sys v0.12.21+1.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]     Checking backoff v0.2.1
[INFO] [stderr]     Checking dirs v3.0.2
[INFO] [stderr]     Checking blake2 v0.9.1
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking serde_test v0.8.23
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking thiserror v1.0.26
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]     Checking config v0.10.1
[INFO] [stderr]     Checking git2 v0.13.20
[INFO] [stderr]    Compiling protobuf-codegen v2.25.0
[INFO] [stderr]    Compiling protobuf-codegen-pure v2.25.0
[INFO] [stderr]    Compiling jujube-lib v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking zstd v0.6.1+zstd.1.4.9
[INFO] [stderr]  Documenting jujube-lib v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(get_mut_unchecked)]
[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 `jujube-lib`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name jujube_lib src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern backoff=/opt/rustwide/target/debug/deps/libbackoff-3034e3c47b41febe.rmeta --extern blake2=/opt/rustwide/target/debug/deps/libblake2-f62440483cfd5843.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-b55b8e72bfe1c077.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-7b9084f8ae89ce82.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-1dab18fc9d360c99.rmeta --extern config=/opt/rustwide/target/debug/deps/libconfig-f9112f3530d7de94.rmeta --extern diff=/opt/rustwide/target/debug/deps/libdiff-d0231f68c2292db7.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-287bced13cf8b2b6.rmeta --extern git2=/opt/rustwide/target/debug/deps/libgit2-fe7ddc16c3325abf.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-4e132399b961d086.rmeta --extern maplit=/opt/rustwide/target/debug/deps/libmaplit-edcadb5581f67864.rmeta --extern protobuf=/opt/rustwide/target/debug/deps/libprotobuf-eafd93777a907c54.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-4542bb366682d4a6.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-9010c99f689210cb.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-d3ed83bd07bad38a.rmeta --extern thiserror=/opt/rustwide/target/debug/deps/libthiserror-de83da186947f82b.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-7e2926e4fb3fed37.rmeta --extern whoami=/opt/rustwide/target/debug/deps/libwhoami-5f2218655917feb8.rmeta --extern zstd=/opt/rustwide/target/debug/deps/libzstd-0a58759b268c1979.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "ab0ae2def6c196cfd8b91b075157b78035f449e33d69113150a8c15d0b4c7688", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab0ae2def6c196cfd8b91b075157b78035f449e33d69113150a8c15d0b4c7688", kill_on_drop: false }`
[INFO] [stdout] ab0ae2def6c196cfd8b91b075157b78035f449e33d69113150a8c15d0b4c7688
