[INFO] cloning repository https://github.com/alec-deason/neat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alec-deason/neat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falec-deason%2Fneat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falec-deason%2Fneat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eecbacc364048a34de55302ac58c7163fce9a5e2
[INFO] documenting alec-deason/neat against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falec-deason%2Fneat" "/workspace/builds/worker-65/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-65/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alec-deason/neat on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alec-deason/neat
[INFO] finished tweaking git repo https://github.com/alec-deason/neat
[INFO] tweaked toml for git repo https://github.com/alec-deason/neat written to /workspace/builds/worker-65/source/Cargo.toml
[INFO] crate git repo https://github.com/alec-deason/neat already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6dd66de4de8f8d6c8f238decbfab61320c9f7b9a4b1b9b2bdbb8bacc2675f497
[INFO] running `Command { std: "docker" "start" "-a" "6dd66de4de8f8d6c8f238decbfab61320c9f7b9a4b1b9b2bdbb8bacc2675f497", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6dd66de4de8f8d6c8f238decbfab61320c9f7b9a4b1b9b2bdbb8bacc2675f497", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6dd66de4de8f8d6c8f238decbfab61320c9f7b9a4b1b9b2bdbb8bacc2675f497", kill_on_drop: false }`
[INFO] [stdout] 6dd66de4de8f8d6c8f238decbfab61320c9f7b9a4b1b9b2bdbb8bacc2675f497
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-65/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 995988889d3fd340d99289b279817a4281814bafc3fce39c94e93d24847fdae3
[INFO] running `Command { std: "docker" "start" "-a" "995988889d3fd340d99289b279817a4281814bafc3fce39c94e93d24847fdae3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking rand_core v0.4.0
[INFO] [stderr]    Compiling libc v0.2.50
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]    Compiling cc v1.0.31
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling serde v1.0.89
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]     Checking fixedbitset v0.1.9
[INFO] [stderr]     Checking either v1.5.1
[INFO] [stderr]     Checking ordermap v0.3.5
[INFO] [stderr]     Checking itoa v0.4.3
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking petgraph v0.4.13
[INFO] [stderr]    Compiling ncurses v5.99.0
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking pancurses v0.16.1
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]     Checking serde_json v1.0.39
[INFO] [stderr]  Documenting neat 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(cell_update)]
[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 `neat`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name neat 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 pancurses=/opt/rustwide/target/debug/deps/libpancurses-0e481487078b2532.rmeta --extern petgraph=/opt/rustwide/target/debug/deps/libpetgraph-f6826ac868c13607.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-9bffb085dbc1e604.rmeta --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-3711039a8b1ba061.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-df7abf655c4aa471.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-86f6bbb971ea1346.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-ea0b923f75222d41.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "995988889d3fd340d99289b279817a4281814bafc3fce39c94e93d24847fdae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "995988889d3fd340d99289b279817a4281814bafc3fce39c94e93d24847fdae3", kill_on_drop: false }`
[INFO] [stdout] 995988889d3fd340d99289b279817a4281814bafc3fce39c94e93d24847fdae3
