[INFO] fetching crate mamba 0.3.0...
[INFO] documenting mamba-0.3.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate mamba 0.3.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate mamba 0.3.0 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 crates.io crate mamba 0.3.0
[INFO] finished tweaking crates.io crate mamba 0.3.0
[INFO] tweaked toml for crates.io crate mamba 0.3.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate mamba 0.3.0 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 pathdiff v0.1.0
[INFO] [stderr]   Downloaded num-bigint v0.2.4
[INFO] [stderr]   Downloaded loggerv v0.7.2
[INFO] [stderr]   Downloaded nom_locate v0.3.1
[INFO] [stderr]   Downloaded unicode_names2 v0.2.2
[INFO] [stderr]   Downloaded python-parser v0.1.0
[INFO] [stderr]   Downloaded wtf8 v0.0.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 2bb4cfcce3b7ab4a5459f4a7d01b4e7afd7441722c9913ce72d1c88515e705ae
[INFO] running `Command { std: "docker" "start" "-a" "2bb4cfcce3b7ab4a5459f4a7d01b4e7afd7441722c9913ce72d1c88515e705ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2bb4cfcce3b7ab4a5459f4a7d01b4e7afd7441722c9913ce72d1c88515e705ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bb4cfcce3b7ab4a5459f4a7d01b4e7afd7441722c9913ce72d1c88515e705ae", kill_on_drop: false }`
[INFO] [stdout] 2bb4cfcce3b7ab4a5459f4a7d01b4e7afd7441722c9913ce72d1c88515e705ae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 0193da1f106c2ae77a064bd217860f33cd780a487cf939c3889aa73c32587f5e
[INFO] running `Command { std: "docker" "start" "-a" "0193da1f106c2ae77a064bd217860f33cd780a487cf939c3889aa73c32587f5e", 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 libc v0.2.66
[INFO] [stderr]    Compiling proc-macro2 v1.0.7
[INFO] [stderr]    Compiling syn v1.0.13
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]    Compiling escargot v0.3.1
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]     Checking bytecount v0.3.2
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking unicode_names2 v0.2.2
[INFO] [stderr]     Checking wtf8 v0.0.3
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking pathdiff v0.1.0
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.4
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking nom v4.2.3
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking predicates v1.0.2
[INFO] [stderr]     Checking nom_locate v0.3.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking loggerv v0.7.2
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking python-parser v0.1.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking assert_cmd v0.10.2
[INFO] [stderr]  Documenting mamba v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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 `mamba`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name mamba 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 ansi_term=/opt/rustwide/target/debug/deps/libansi_term-adc7adf55a067047.rmeta --extern assert_cmd=/opt/rustwide/target/debug/deps/libassert_cmd-dfca83a0c9745c80.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-a910ffe98bd5f259.rmeta --extern glob=/opt/rustwide/target/debug/deps/libglob-029696837cd6fb58.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-6973353daf880242.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-8cb8a4ba47ef9b79.rmeta --extern loggerv=/opt/rustwide/target/debug/deps/libloggerv-cc3aa2272f72f84f.rmeta --extern pathdiff=/opt/rustwide/target/debug/deps/libpathdiff-4e5a2e240b184a06.rmeta --extern python_parser=/opt/rustwide/target/debug/deps/libpython_parser-248849981bd2897a.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-defa070993afd1a6.rmeta --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "0193da1f106c2ae77a064bd217860f33cd780a487cf939c3889aa73c32587f5e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0193da1f106c2ae77a064bd217860f33cd780a487cf939c3889aa73c32587f5e", kill_on_drop: false }`
[INFO] [stdout] 0193da1f106c2ae77a064bd217860f33cd780a487cf939c3889aa73c32587f5e
