[INFO] fetching crate opencontainers 0.0.0-alpha.2...
[INFO] documenting opencontainers-0.0.0-alpha.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate opencontainers 0.0.0-alpha.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate opencontainers 0.0.0-alpha.2 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b3857a6d5c99fc47f37c2f6596aadd12974191d1bc7130ce4f94e3bc7ae02e6
[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" "3b3857a6d5c99fc47f37c2f6596aadd12974191d1bc7130ce4f94e3bc7ae02e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b3857a6d5c99fc47f37c2f6596aadd12974191d1bc7130ce4f94e3bc7ae02e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b3857a6d5c99fc47f37c2f6596aadd12974191d1bc7130ce4f94e3bc7ae02e6", kill_on_drop: false }`
[INFO] [stdout] 3b3857a6d5c99fc47f37c2f6596aadd12974191d1bc7130ce4f94e3bc7ae02e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 27c24c357f6ec785c4031b8651e681bd970050692868ea8c199a3d49da534d9e
[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" "27c24c357f6ec785c4031b8651e681bd970050692868ea8c199a3d49da534d9e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking ttl_cache v0.5.1
[INFO] [stderr]     Checking hyperx v0.13.2
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking cookie_store v0.7.0
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking hyper v0.12.35
[INFO] [stderr]     Checking www-authenticate v0.3.0
[INFO] [stderr]     Checking hyper-tls v0.3.2
[INFO] [stderr]     Checking reqwest v0.9.24
[INFO] [stderr]  Documenting opencontainers v0.0.0-alpha.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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-f9ff76c1e0a94535.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-56dd397d7044e9d2.rmeta --extern hyperx=/opt/rustwide/target/debug/deps/libhyperx-337e7302872df853.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-95a9d57e67df36ac.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-2de5595cb6b09a5a.rmeta --extern pest_derive=/opt/rustwide/target/debug/deps/libpest_derive-c2cd1c8fba1492e3.so --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-2d5e197193ece31a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-d1f24ad445d04cd0.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-3a89c57880b62507.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-84a39eece91e0e31.rmeta --extern ttl_cache=/opt/rustwide/target/debug/deps/libttl_cache-60f6e850ae89ce8b.rmeta --extern www_authenticate=/opt/rustwide/target/debug/deps/libwww_authenticate-c068cabba2b5520b.rmeta --cap-lints=warn --crate-version 0.0.0-alpha.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "27c24c357f6ec785c4031b8651e681bd970050692868ea8c199a3d49da534d9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27c24c357f6ec785c4031b8651e681bd970050692868ea8c199a3d49da534d9e", kill_on_drop: false }`
[INFO] [stdout] 27c24c357f6ec785c4031b8651e681bd970050692868ea8c199a3d49da534d9e