[INFO] fetching crate opencontainers 0.0.0-alpha.2...
[INFO] documenting opencontainers-0.0.0-alpha.2 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate opencontainers 0.0.0-alpha.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate opencontainers 0.0.0-alpha.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce5c022aa2cf69e8887dcf96c9020a62afef8d852e8e2f00c6a3f2028965e7b2
[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" "ce5c022aa2cf69e8887dcf96c9020a62afef8d852e8e2f00c6a3f2028965e7b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce5c022aa2cf69e8887dcf96c9020a62afef8d852e8e2f00c6a3f2028965e7b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce5c022aa2cf69e8887dcf96c9020a62afef8d852e8e2f00c6a3f2028965e7b2", kill_on_drop: false }`
[INFO] [stdout] ce5c022aa2cf69e8887dcf96c9020a62afef8d852e8e2f00c6a3f2028965e7b2
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b659dba7a85c22f7468bae0b3eb68f0221b49cfc156fbf7b2160a1b02e5c1dda
[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" "b659dba7a85c22f7468bae0b3eb68f0221b49cfc156fbf7b2160a1b02e5c1dda", kill_on_drop: false }`
[INFO] [stderr]     Checking try_from v0.3.2
[INFO] [stderr]     Checking ttl_cache v0.5.1
[INFO] [stderr]    Compiling hyper v0.12.36
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]     Checking serde v1.0.127
[INFO] [stderr]     Checking cookie v0.12.0
[INFO] [stderr]     Checking native-tls v0.2.7
[INFO] [stderr]     Checking publicsuffix v1.5.6
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking tokio-buf v0.1.1
[INFO] [stderr]     Checking string v0.2.1
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking hyperx v0.13.2
[INFO] [stderr]     Checking serde_json v1.0.66
[INFO] [stderr]     Checking serde_urlencoded v0.5.5
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking www-authenticate v0.3.0
[INFO] [stderr]     Checking cookie_store v0.7.0
[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 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-8f04ad07768886d6.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-7b50184a627775cc.rmeta --extern hyperx=/opt/rustwide/target/debug/deps/libhyperx-6eac050c896ab071.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f8abb66ffc16068c.rmeta --extern pest=/opt/rustwide/target/debug/deps/libpest-623493691dac33aa.rmeta --extern pest_derive=/opt/rustwide/target/debug/deps/libpest_derive-37832782ff159aaa.so --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-d4461419cdffb093.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-f34436159fac0af7.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-f282cc1f57f3d638.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-15555f2003f0c506.rmeta --extern ttl_cache=/opt/rustwide/target/debug/deps/libttl_cache-7fb519335488d76e.rmeta --extern www_authenticate=/opt/rustwide/target/debug/deps/libwww_authenticate-497684371434b60b.rmeta --cap-lints=warn --crate-version 0.0.0-alpha.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "b659dba7a85c22f7468bae0b3eb68f0221b49cfc156fbf7b2160a1b02e5c1dda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b659dba7a85c22f7468bae0b3eb68f0221b49cfc156fbf7b2160a1b02e5c1dda", kill_on_drop: false }`
[INFO] [stdout] b659dba7a85c22f7468bae0b3eb68f0221b49cfc156fbf7b2160a1b02e5c1dda
