[INFO] cloning repository https://github.com/terciodemelo/rtasks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/terciodemelo/rtasks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterciodemelo%2Frtasks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterciodemelo%2Frtasks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1652881dc72fad570036ddd83c84f264ac2643e0
[INFO] documenting terciodemelo/rtasks against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterciodemelo%2Frtasks" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/terciodemelo/rtasks 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 git repo https://github.com/terciodemelo/rtasks
[INFO] finished tweaking git repo https://github.com/terciodemelo/rtasks
[INFO] tweaked toml for git repo https://github.com/terciodemelo/rtasks written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/terciodemelo/rtasks 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 4955a114932964be9c2a9666956398dfffe11d48d177bb226aa3300083e78e88
[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" "4955a114932964be9c2a9666956398dfffe11d48d177bb226aa3300083e78e88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4955a114932964be9c2a9666956398dfffe11d48d177bb226aa3300083e78e88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4955a114932964be9c2a9666956398dfffe11d48d177bb226aa3300083e78e88", kill_on_drop: false }`
[INFO] [stdout] 4955a114932964be9c2a9666956398dfffe11d48d177bb226aa3300083e78e88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 8a9ff8ff6be37fb48789d3c440cb32edaf94a4fb3c10618ead60d892d9635d6e
[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" "8a9ff8ff6be37fb48789d3c440cb32edaf94a4fb3c10618ead60d892d9635d6e", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_derive v1.0.83
[INFO] [stderr]     Checking dirs v1.0.4
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking uuid v0.7.1
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]  Documenting rtasks 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(box_syntax, box_patterns)]
[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 `rtasks`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rtasks 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 chrono=/opt/rustwide/target/debug/deps/libchrono-119b857982831513.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-a8b546beeb3a19f9.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-cdb65b73d6f3ca91.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-e24690e23b836981.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-323252cf62e178cc.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-c9e3d13960f30800.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-257f0b361ae53eed.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8a9ff8ff6be37fb48789d3c440cb32edaf94a4fb3c10618ead60d892d9635d6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a9ff8ff6be37fb48789d3c440cb32edaf94a4fb3c10618ead60d892d9635d6e", kill_on_drop: false }`
[INFO] [stdout] 8a9ff8ff6be37fb48789d3c440cb32edaf94a4fb3c10618ead60d892d9635d6e