[INFO] fetching crate lockchain-core 0.9.0...
[INFO] documenting lockchain-core-0.9.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate lockchain-core 0.9.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate lockchain-core 0.9.0 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 lockchain-core 0.9.0
[INFO] finished tweaking crates.io crate lockchain-core 0.9.0
[INFO] tweaked toml for crates.io crate lockchain-core 0.9.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 62eb4244f93f8781c17f9e6813a319fdf751c07b8e2c934c9462048e1d26f029
[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" "62eb4244f93f8781c17f9e6813a319fdf751c07b8e2c934c9462048e1d26f029", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "62eb4244f93f8781c17f9e6813a319fdf751c07b8e2c934c9462048e1d26f029", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62eb4244f93f8781c17f9e6813a319fdf751c07b8e2c934c9462048e1d26f029", kill_on_drop: false }`
[INFO] [stdout] 62eb4244f93f8781c17f9e6813a319fdf751c07b8e2c934c9462048e1d26f029
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 4a05585893f88d1779df952ce57aef70984596ede429f4a58ef385d9d2958315
[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" "4a05585893f88d1779df952ce57aef70984596ede429f4a58ef385d9d2958315", kill_on_drop: false }`
[INFO] [stderr]    Compiling pam-sys v0.5.6
[INFO] [stderr]    Compiling nix v0.11.1
[INFO] [stderr]     Checking users v0.5.3
[INFO] [stderr]     Checking crypto-mac v0.6.2
[INFO] [stderr]     Checking base64 v0.8.0
[INFO] [stderr]     Checking blake2 v0.7.1
[INFO] [stderr]     Checking blowfish v0.4.0
[INFO] [stderr]     Checking hmac v0.6.3
[INFO] [stderr]     Checking pbkdf2 v0.2.3
[INFO] [stderr]     Checking bcrypt v0.2.2
[INFO] [stderr]     Checking keybob v0.3.1
[INFO] [stderr]     Checking pam-auth v0.5.5
[INFO] [stderr]  Documenting lockchain-core v0.9.0 (/opt/rustwide/workdir)
[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(external_doc)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `lockchain-core`.
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name lockchain_core 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 base64=/opt/rustwide/target/debug/deps/libbase64-78acb82739464a66.rmeta --extern bcrypt=/opt/rustwide/target/debug/deps/libbcrypt-3af9fd6fe1c7036f.rmeta --extern blake2=/opt/rustwide/target/debug/deps/libblake2-dbaedbf2f296e5d4.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-7fd335931d34b3f7.rmeta --extern keybob=/opt/rustwide/target/debug/deps/libkeybob-fee7342cd1cbc94c.rmeta --extern nix=/opt/rustwide/target/debug/deps/libnix-fd0758429a6d2482.rmeta --extern pam_auth=/opt/rustwide/target/debug/deps/libpam_auth-4bf80b57ab37331c.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b3eca24ad1a4391d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5429dd6d097468fb.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-9657277a275bd2e8.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-dbda8714378e19d3.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "4a05585893f88d1779df952ce57aef70984596ede429f4a58ef385d9d2958315", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a05585893f88d1779df952ce57aef70984596ede429f4a58ef385d9d2958315", kill_on_drop: false }`
[INFO] [stdout] 4a05585893f88d1779df952ce57aef70984596ede429f4a58ef385d9d2958315