[INFO] fetching crate hars 0.1.0...
[INFO] documenting hars-0.1.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate hars 0.1.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate hars 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 hars 0.1.0
[INFO] finished tweaking crates.io crate hars 0.1.0
[INFO] tweaked toml for crates.io crate hars 0.1.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate hars 0.1.0 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 6d9e1ad14d7f5a67172a001058136b7bd5a6f46a7ed462626da5345f0c516d38
[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" "6d9e1ad14d7f5a67172a001058136b7bd5a6f46a7ed462626da5345f0c516d38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d9e1ad14d7f5a67172a001058136b7bd5a6f46a7ed462626da5345f0c516d38", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d9e1ad14d7f5a67172a001058136b7bd5a6f46a7ed462626da5345f0c516d38", kill_on_drop: false }`
[INFO] [stdout] 6d9e1ad14d7f5a67172a001058136b7bd5a6f46a7ed462626da5345f0c516d38
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 33fb35df9078d11d27790552dea42b3414e372c1d16f9122defef9a30d082e23
[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" "33fb35df9078d11d27790552dea42b3414e372c1d16f9122defef9a30d082e23", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]     Checking regex-syntax v0.6.13
[INFO] [stderr]     Checking unicode-normalization v0.1.12
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]     Checking yaml-rust v0.4.3
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking clicolors-control v1.0.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking directories v2.0.2
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking regex v1.3.3
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]     Checking publicsuffix v1.5.4
[INFO] [stderr]     Checking console v0.9.2
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling tokio-macros v0.2.3
[INFO] [stderr]    Compiling pin-project-internal v0.4.7
[INFO] [stderr]     Checking tokio v0.2.10
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking pin-project v0.4.7
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tokio-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.2.1
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]     Checking hyper v0.13.1
[INFO] [stderr]     Checking serde_json v1.0.45
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking bincode v1.2.1
[INFO] [stderr]     Checking serde_yaml v0.8.11
[INFO] [stderr]     Checking hyper-tls v0.4.1
[INFO] [stderr]     Checking cookie_store v0.10.0
[INFO] [stderr]     Checking reqwest v0.10.1
[INFO] [stderr]  Documenting hars 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(vec_remove_item)]
[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 `hars`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name hars 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 bincode=/opt/rustwide/target/debug/deps/libbincode-78c8665bc5e5820b.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-5d4d00fd5d0fd209.rmeta --extern clap=/opt/rustwide/target/debug/deps/libclap-75ea384b1f7f2595.rmeta --extern console=/opt/rustwide/target/debug/deps/libconsole-1575b853a40b9ffb.rmeta --extern directories=/opt/rustwide/target/debug/deps/libdirectories-0c819c511d2cb71c.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-9f4dc298855d5bfa.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-8bc507e33c3afce1.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-32a0f5cb7b954f77.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-b191b361f400b9b2.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-23dfb92b4b04d233.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-86d76ffd288a5dfe.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-c961fbb78cf15be9.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-fbcf7697698eabb8.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "33fb35df9078d11d27790552dea42b3414e372c1d16f9122defef9a30d082e23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33fb35df9078d11d27790552dea42b3414e372c1d16f9122defef9a30d082e23", kill_on_drop: false }`
[INFO] [stdout] 33fb35df9078d11d27790552dea42b3414e372c1d16f9122defef9a30d082e23