[INFO] cloning repository https://github.com/gfreezy/bitcask-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gfreezy/bitcask-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgfreezy%2Fbitcask-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgfreezy%2Fbitcask-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 04fabaaf969b18319475ba6cebafde3d690aa5e5
[INFO] documenting gfreezy/bitcask-rs 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%2Fgfreezy%2Fbitcask-rs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gfreezy/bitcask-rs 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/gfreezy/bitcask-rs
[INFO] finished tweaking git repo https://github.com/gfreezy/bitcask-rs
[INFO] tweaked toml for git repo https://github.com/gfreezy/bitcask-rs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/gfreezy/bitcask-rs 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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 79f38011a43db9801a09f4d33b4144d692b65cf602d5b1c9cfc4b09b56e65949
[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" "79f38011a43db9801a09f4d33b4144d692b65cf602d5b1c9cfc4b09b56e65949", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "79f38011a43db9801a09f4d33b4144d692b65cf602d5b1c9cfc4b09b56e65949", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79f38011a43db9801a09f4d33b4144d692b65cf602d5b1c9cfc4b09b56e65949", kill_on_drop: false }`
[INFO] [stdout] 79f38011a43db9801a09f4d33b4144d692b65cf602d5b1c9cfc4b09b56e65949
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0a58dc92e524eee4f0428cc797ae81e6b11247597176c3e20677ef0f08c55fc0
[INFO] running `Command { std: "docker" "start" "-a" "0a58dc92e524eee4f0428cc797ae81e6b11247597176c3e20677ef0f08c55fc0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.15
[INFO] [stderr]     Checking log-mdc v0.1.0
[INFO] [stderr]     Checking integer-encoding v1.0.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]     Checking io-at v0.4.1
[INFO] [stderr]     Checking yaml-rust v0.4.0
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]    Compiling derive_builder_core v0.2.0
[INFO] [stderr]     Checking log v0.4.4
[INFO] [stderr]     Checking num-integer v0.1.39
[INFO] [stderr]     Checking ordered-float v0.5.0
[INFO] [stderr]     Checking serde-value v0.5.2
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking serde_yaml v0.7.5
[INFO] [stderr]     Checking serde_yaml v0.8.2
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling derive_builder v0.5.1
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking flate2 v1.0.2
[INFO] [stderr]     Checking backtrace v0.3.9
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling serde_derive v1.0.75
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking failure v0.1.2
[INFO] [stderr]     Checking log4rs v0.8.0
[INFO] [stderr]  Documenting bitcask-rs v0.1.1 (/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(nll)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![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 3 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 `bitcask-rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name bitcask_rs 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 derive_builder=/opt/rustwide/target/debug/deps/libderive_builder-3e8bacabf563736a.so --extern failure=/opt/rustwide/target/debug/deps/libfailure-5cd030bfa11672ce.rmeta --extern integer_encoding=/opt/rustwide/target/debug/deps/libinteger_encoding-5c9df36f89fb6cb9.rmeta --extern io_at=/opt/rustwide/target/debug/deps/libio_at-9e55321359d52413.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-a4e01d700bacbbb2.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-bd0087544095cdce.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-a523a64ab16e6c4c.rmeta --extern log4rs=/opt/rustwide/target/debug/deps/liblog4rs-ad0a1f712efac46d.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-2a8d72e47a03f36d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5ce26244de0b22d6.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-73e87643372d9b2f.so --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-7036edf6c65a38cd.rmeta --extern twox_hash=/opt/rustwide/target/debug/deps/libtwox_hash-91ede851a33297ca.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-24ab840fd0dd5a54.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "0a58dc92e524eee4f0428cc797ae81e6b11247597176c3e20677ef0f08c55fc0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a58dc92e524eee4f0428cc797ae81e6b11247597176c3e20677ef0f08c55fc0", kill_on_drop: false }`
[INFO] [stdout] 0a58dc92e524eee4f0428cc797ae81e6b11247597176c3e20677ef0f08c55fc0