[INFO] fetching crate fozzie 1.3.0...
[INFO] documenting fozzie-1.3.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate fozzie 1.3.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate fozzie 1.3.0 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 fozzie 1.3.0
[INFO] finished tweaking crates.io crate fozzie 1.3.0
[INFO] tweaked toml for crates.io crate fozzie 1.3.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate fozzie 1.3.0 already has a lockfile, it will not be regenerated
[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-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" "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] 33b076c0e73c63684032d2439c93d353dd9b9cbaaa52efa871d010418ce4c7c3
[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" "33b076c0e73c63684032d2439c93d353dd9b9cbaaa52efa871d010418ce4c7c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "33b076c0e73c63684032d2439c93d353dd9b9cbaaa52efa871d010418ce4c7c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33b076c0e73c63684032d2439c93d353dd9b9cbaaa52efa871d010418ce4c7c3", kill_on_drop: false }`
[INFO] [stdout] 33b076c0e73c63684032d2439c93d353dd9b9cbaaa52efa871d010418ce4c7c3
[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" "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] ffbd369ebea270601271ffbd9c21095e97d1e33d55b193efc44861da84a742e5
[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" "ffbd369ebea270601271ffbd9c21095e97d1e33d55b193efc44861da84a742e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-width v0.1.7
[INFO] [stderr]    Compiling regex-syntax v0.6.17
[INFO] [stderr]    Compiling aho-corasick v0.7.10
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling term_size v1.0.0-beta1
[INFO] [stderr]     Checking raw_tty v0.1.0
[INFO] [stderr]     Checking termion v1.5.5
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling regex v1.3.7
[INFO] [stderr]    Compiling fozzie v1.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting fozzie v1.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `fozzie`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name fozzie 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 clap=/opt/rustwide/target/debug/deps/libclap-987d58f7336a1d49.rmeta --extern float_cmp=/opt/rustwide/target/debug/deps/libfloat_cmp-5c075f15e69e0760.rmeta --extern raw_tty=/opt/rustwide/target/debug/deps/libraw_tty-b7d338cf4c876dde.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-144324b3e2dea50c.rmeta --extern term_size=/opt/rustwide/target/debug/deps/libterm_size-9e0d5b01f8a5923c.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-b00b04bb0e9f606f.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "ffbd369ebea270601271ffbd9c21095e97d1e33d55b193efc44861da84a742e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffbd369ebea270601271ffbd9c21095e97d1e33d55b193efc44861da84a742e5", kill_on_drop: false }`
[INFO] [stdout] ffbd369ebea270601271ffbd9c21095e97d1e33d55b193efc44861da84a742e5