[INFO] cloning repository https://github.com/gotcake/rust-nerual-net
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gotcake/rust-nerual-net" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgotcake%2Frust-nerual-net", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgotcake%2Frust-nerual-net'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7013146a325b81c0989a90ecca7b1e2f6071aae2
[INFO] documenting gotcake/rust-nerual-net 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%2Fgotcake%2Frust-nerual-net" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gotcake/rust-nerual-net 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] removed /workspace/builds/worker-6/source/.cargo/config
[INFO] started tweaking git repo https://github.com/gotcake/rust-nerual-net
[INFO] finished tweaking git repo https://github.com/gotcake/rust-nerual-net
[INFO] tweaked toml for git repo https://github.com/gotcake/rust-nerual-net written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/gotcake/rust-nerual-net 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-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] c1a2bb12a8f981c0b5545385f444f10f93af586eee4943a9c863e5dc7494de53
[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" "c1a2bb12a8f981c0b5545385f444f10f93af586eee4943a9c863e5dc7494de53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1a2bb12a8f981c0b5545385f444f10f93af586eee4943a9c863e5dc7494de53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1a2bb12a8f981c0b5545385f444f10f93af586eee4943a9c863e5dc7494de53", kill_on_drop: false }`
[INFO] [stdout] c1a2bb12a8f981c0b5545385f444f10f93af586eee4943a9c863e5dc7494de53
[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] 47db00f34b29acc4a50c1b6118f1f1b86663c0d354c33dde4cffd3e552f06de3
[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" "47db00f34b29acc4a50c1b6118f1f1b86663c0d354c33dde4cffd3e552f06de3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling syn v1.0.16
[INFO] [stderr]    Compiling fnv v1.0.6
[INFO] [stderr]    Compiling ident_case v1.0.0
[INFO] [stderr]    Compiling serde v1.0.84
[INFO] [stderr]     Checking objekt v0.1.2
[INFO] [stderr]     Checking fast-math v0.1.0
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.3
[INFO] [stderr]    Compiling num-iter v0.1.40
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]     Checking crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling rand_chacha v0.1.0
[INFO] [stderr]    Compiling rand v0.6.1
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking rand_pcg v0.1.1
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking csv-core v0.1.5
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]     Checking num-integer v0.1.42
[INFO] [stderr]    Compiling syn v0.15.28
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]    Compiling serde_derive v1.0.89
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling derive_builder_core v0.9.0
[INFO] [stderr]    Compiling derive_builder v0.9.0
[INFO] [stderr]     Checking csv v1.0.5
[INFO] [stderr]  Documenting rust_neural_net 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(slice_index_methods)]
[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 `rust_neural_net`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name rust_neural_net 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 crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-1eee1d898bceaa7b.rmeta --extern csv=/opt/rustwide/target/debug/deps/libcsv-830d0bf1c63f3953.rmeta --extern derive_builder=/opt/rustwide/target/debug/deps/libderive_builder-eff28e0b083060ed.so --extern fast_math=/opt/rustwide/target/debug/deps/libfast_math-c73e59cffa08d83e.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-3b466a4978391dd5.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-70a87f6f4e7ddb47.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-de4e9c0dc341a827.rmeta --extern objekt=/opt/rustwide/target/debug/deps/libobjekt-1fdc5c56f2b83235.rmeta --extern quick_error=/opt/rustwide/target/debug/deps/libquick_error-33ea2cc8d53e5b67.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b27e6a6f4d96265e.rmeta --extern rand_xorshift=/opt/rustwide/target/debug/deps/librand_xorshift-d2f7c02ca95e30af.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-338e1fc5bd73c75f.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "47db00f34b29acc4a50c1b6118f1f1b86663c0d354c33dde4cffd3e552f06de3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47db00f34b29acc4a50c1b6118f1f1b86663c0d354c33dde4cffd3e552f06de3", kill_on_drop: false }`
[INFO] [stdout] 47db00f34b29acc4a50c1b6118f1f1b86663c0d354c33dde4cffd3e552f06de3