[INFO] fetching crate syslog_rfc3164 0.1.0...
[INFO] documenting syslog_rfc3164-0.1.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate syslog_rfc3164 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate syslog_rfc3164 0.1.0 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 syslog_rfc3164 0.1.0
[INFO] finished tweaking crates.io crate syslog_rfc3164 0.1.0
[INFO] tweaked toml for crates.io crate syslog_rfc3164 0.1.0 written to /workspace/builds/worker-1/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] 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 929cef761a468f037f301c18ca9ac89754b95cc5e028bcaebe809cbd7fb7975e
[INFO] running `Command { std: "docker" "start" "-a" "929cef761a468f037f301c18ca9ac89754b95cc5e028bcaebe809cbd7fb7975e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "929cef761a468f037f301c18ca9ac89754b95cc5e028bcaebe809cbd7fb7975e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "929cef761a468f037f301c18ca9ac89754b95cc5e028bcaebe809cbd7fb7975e", kill_on_drop: false }`
[INFO] [stdout] 929cef761a468f037f301c18ca9ac89754b95cc5e028bcaebe809cbd7fb7975e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] c8cdd97a1399ad84330d810def9d58f6c0a09272527f8ac5d2b5971cbeb84101
[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" "c8cdd97a1399ad84330d810def9d58f6c0a09272527f8ac5d2b5971cbeb84101", 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] [stderr]     Checking assert_matches v1.4.0
[INFO] [stderr]  Documenting syslog_rfc3164 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | #![feature(match_default_bindings)]
[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 `syslog_rfc3164`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name syslog_rfc3164 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 assert_matches=/opt/rustwide/target/debug/deps/libassert_matches-492804ecfe6ae19e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-eb6cdf579abc545a.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-5f078a3096470b53.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-1aecc52d37c4e52d.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-b740c6fdac0712ad.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "c8cdd97a1399ad84330d810def9d58f6c0a09272527f8ac5d2b5971cbeb84101", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c8cdd97a1399ad84330d810def9d58f6c0a09272527f8ac5d2b5971cbeb84101", kill_on_drop: false }`
[INFO] [stdout] c8cdd97a1399ad84330d810def9d58f6c0a09272527f8ac5d2b5971cbeb84101
