[INFO] cloning repository https://github.com/cherryleafroad/flp_decoder
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cherryleafroad/flp_decoder" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcherryleafroad%2Fflp_decoder", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcherryleafroad%2Fflp_decoder'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bc05feb5663add35ff0b349a7397cae9b8c6c1a5
[INFO] documenting cherryleafroad/flp_decoder against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcherryleafroad%2Fflp_decoder" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cherryleafroad/flp_decoder 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 git repo https://github.com/cherryleafroad/flp_decoder
[INFO] finished tweaking git repo https://github.com/cherryleafroad/flp_decoder
[INFO] tweaked toml for git repo https://github.com/cherryleafroad/flp_decoder written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/cherryleafroad/flp_decoder already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] be7dd6debba60de6b7a7d2e522529e676c94657791fb537e8821d372128abfda
[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" "be7dd6debba60de6b7a7d2e522529e676c94657791fb537e8821d372128abfda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be7dd6debba60de6b7a7d2e522529e676c94657791fb537e8821d372128abfda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be7dd6debba60de6b7a7d2e522529e676c94657791fb537e8821d372128abfda", kill_on_drop: false }`
[INFO] [stdout] be7dd6debba60de6b7a7d2e522529e676c94657791fb537e8821d372128abfda
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 6f92be9c15259bf3453234652e5f1a3a398cc872922c4795f84c4b2dbfbb0d6e
[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" "6f92be9c15259bf3453234652e5f1a3a398cc872922c4795f84c4b2dbfbb0d6e", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling proc-macro-crate v1.1.0
[INFO] [stderr]    Compiling num_enum_derive v0.5.4
[INFO] [stderr]     Checking num_enum v0.5.4
[INFO] [stderr]  Documenting flp_unlocker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `flp_unlocker`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name flp_unlocker src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=69f9724494124d24 -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-7c274f399d426ec2.rmeta --extern num_enum=/opt/rustwide/target/debug/deps/libnum_enum-cb5f1c8649f21278.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "6f92be9c15259bf3453234652e5f1a3a398cc872922c4795f84c4b2dbfbb0d6e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f92be9c15259bf3453234652e5f1a3a398cc872922c4795f84c4b2dbfbb0d6e", kill_on_drop: false }`
[INFO] [stdout] 6f92be9c15259bf3453234652e5f1a3a398cc872922c4795f84c4b2dbfbb0d6e