[INFO] fetching crate opencontainers 0.0.0-alpha.2...
[INFO] documenting opencontainers-0.0.0-alpha.2 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate opencontainers 0.0.0-alpha.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate opencontainers 0.0.0-alpha.2 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate opencontainers 0.0.0-alpha.2
[INFO] finished tweaking crates.io crate opencontainers 0.0.0-alpha.2
[INFO] tweaked toml for crates.io crate opencontainers 0.0.0-alpha.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e07d1d441665fbfe4e3ec7d1c217d57910b1139dbfaaa9e4133f46eda5046589
[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" "e07d1d441665fbfe4e3ec7d1c217d57910b1139dbfaaa9e4133f46eda5046589", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e07d1d441665fbfe4e3ec7d1c217d57910b1139dbfaaa9e4133f46eda5046589", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e07d1d441665fbfe4e3ec7d1c217d57910b1139dbfaaa9e4133f46eda5046589", kill_on_drop: false }`
[INFO] [stdout] e07d1d441665fbfe4e3ec7d1c217d57910b1139dbfaaa9e4133f46eda5046589
[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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e84b6955e65bc7ba9c08204b9bbd8fb700d4d4a150f382cd6d39a4a5081cf80a
[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" "e84b6955e65bc7ba9c08204b9bbd8fb700d4d4a150f382cd6d39a4a5081cf80a", kill_on_drop: false }`
[INFO] [stderr]     Checking ttl_cache v0.5.1
[INFO] [stderr]     Checking hyperx v0.13.2
[INFO] [stderr]     Checking www-authenticate v0.3.0
[INFO] [stderr]  Documenting opencontainers v0.0.0-alpha.2 (/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(never_type)]
[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 `opencontainers`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name opencontainers 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 chrono=/opt/rustwide/target/debug/deps/libchrono-db24c5d739845b0e.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-fa85c9e222265e84.rmeta --extern hyperx=/opt/rustwide/target/debug/deps/libhyperx-82405372a5a00ad1.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-48fbfd5d624c4cb9.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-5f024c746d2508a8.rmeta --extern pest_derive=/opt/rustwide/target/debug/deps/libpest_derive-72209431a0ed0255.so --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-bc8d58638ef28fda.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ce360c6747a68ca1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-cd17107806a312ab.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-a547664976a3b244.rmeta --extern ttl_cache=/opt/rustwide/target/debug/deps/libttl_cache-607da5a3dc987823.rmeta --extern www_authenticate=/opt/rustwide/target/debug/deps/libwww_authenticate-8126f10d6ac21343.rmeta --cap-lints=warn --crate-version 0.0.0-alpha.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e84b6955e65bc7ba9c08204b9bbd8fb700d4d4a150f382cd6d39a4a5081cf80a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e84b6955e65bc7ba9c08204b9bbd8fb700d4d4a150f382cd6d39a4a5081cf80a", kill_on_drop: false }`
[INFO] [stdout] e84b6955e65bc7ba9c08204b9bbd8fb700d4d4a150f382cd6d39a4a5081cf80a
