[INFO] fetching crate fuzzcheck_serializer 0.6.0...
[INFO] documenting fuzzcheck_serializer-0.6.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate fuzzcheck_serializer 0.6.0 into /workspace/builds/worker-59/source
[INFO] validating manifest of crates.io crate fuzzcheck_serializer 0.6.0 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fuzzcheck_serializer 0.6.0
[INFO] finished tweaking crates.io crate fuzzcheck_serializer 0.6.0
[INFO] tweaked toml for crates.io crate fuzzcheck_serializer 0.6.0 written to /workspace/builds/worker-59/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "fetch" "--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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded json v0.12.4
[INFO] [stderr]   Downloaded decent-synquote-alternative v0.3.0
[INFO] [stderr]   Downloaded fuzzcheck_traits v0.6.0
[INFO] [stderr]   Downloaded decent-serde-json-derive-alternative v0.4.0
[INFO] [stderr]   Downloaded decent-serde-json-alternative v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bc7c59160146492ee9f28f3d5638a984973abd394aff4f93673e604aca67b86b
[INFO] running `Command { std: "docker" "start" "-a" "bc7c59160146492ee9f28f3d5638a984973abd394aff4f93673e604aca67b86b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bc7c59160146492ee9f28f3d5638a984973abd394aff4f93673e604aca67b86b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc7c59160146492ee9f28f3d5638a984973abd394aff4f93673e604aca67b86b", kill_on_drop: false }`
[INFO] [stdout] bc7c59160146492ee9f28f3d5638a984973abd394aff4f93673e604aca67b86b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-59/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f76385081fa34ab9f6141772391aa8e533f28f37d989841111e2bb992a785eb2
[INFO] running `Command { std: "docker" "start" "-a" "f76385081fa34ab9f6141772391aa8e533f28f37d989841111e2bb992a785eb2", 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] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/fuzzcheck_traits-0.6.0/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(arc_new_cyclic)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking fuzzcheck_traits v0.6.0
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fuzzcheck_traits` due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "f76385081fa34ab9f6141772391aa8e533f28f37d989841111e2bb992a785eb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f76385081fa34ab9f6141772391aa8e533f28f37d989841111e2bb992a785eb2", kill_on_drop: false }`
[INFO] [stdout] f76385081fa34ab9f6141772391aa8e533f28f37d989841111e2bb992a785eb2