[INFO] fetching crate pippin 0.1.0...
[INFO] documenting pippin-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate pippin 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate pippin 0.1.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pippin 0.1.0
[INFO] finished tweaking crates.io crate pippin 0.1.0
[INFO] tweaked toml for crates.io crate pippin 0.1.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45e5c9dd1933f1ecd525ef9c2f52ef12e4da809136034ff161f3f11ef7e01170
[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" "45e5c9dd1933f1ecd525ef9c2f52ef12e4da809136034ff161f3f11ef7e01170", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45e5c9dd1933f1ecd525ef9c2f52ef12e4da809136034ff161f3f11ef7e01170", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45e5c9dd1933f1ecd525ef9c2f52ef12e4da809136034ff161f3f11ef7e01170", kill_on_drop: false }`
[INFO] [stdout] 45e5c9dd1933f1ecd525ef9c2f52ef12e4da809136034ff161f3f11ef7e01170
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 071ba498e6f2bcda24d4138a5fb6bee1d7564fa81e0918b9a3db45e5b87024ec
[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" "071ba498e6f2bcda24d4138a5fb6bee1d7564fa81e0918b9a3db45e5b87024ec", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling winapi-build v0.1.1
[INFO] [stderr]     Checking winapi v0.2.8
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking regex-syntax v0.3.9
[INFO] [stderr]     Checking utf8-ranges v0.1.3
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking hashindexed v0.1.1
[INFO] [stderr]     Checking vec_map v0.6.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking memchr v0.1.11
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking aho-corasick v0.5.3
[INFO] [stderr]    Compiling kernel32-sys v0.2.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking thread-id v2.0.0
[INFO] [stderr]     Checking walkdir v0.1.8
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking thread_local v0.2.7
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]     Checking regex v0.1.80
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking chrono v0.2.25
[INFO] [stderr]  Documenting pippin v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:68:1
[INFO] [stdout]    |
[INFO] [stdout] 68 | #![feature(step_by)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:73:1
[INFO] [stdout]    |
[INFO] [stdout] 73 | #![feature(box_syntax)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `pippin`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name pippin 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 byteorder=/opt/rustwide/target/debug/deps/libbyteorder-adede747e00f61a9.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-184a589c993ba0ce.rmeta --extern hashindexed=/opt/rustwide/target/debug/deps/libhashindexed-5ccd36382fb2631f.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-538ccf74a4ec0a82.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-85efb7b923645623.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-295fbe090bc4be65.rmeta --extern crypto=/opt/rustwide/target/debug/deps/libcrypto-890a98193efafa7c.rmeta --extern vec_map=/opt/rustwide/target/debug/deps/libvec_map-f96bf43689e4b41a.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-d5bf058959bf97e5.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "071ba498e6f2bcda24d4138a5fb6bee1d7564fa81e0918b9a3db45e5b87024ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "071ba498e6f2bcda24d4138a5fb6bee1d7564fa81e0918b9a3db45e5b87024ec", kill_on_drop: false }`
[INFO] [stdout] 071ba498e6f2bcda24d4138a5fb6bee1d7564fa81e0918b9a3db45e5b87024ec