[INFO] fetching crate lockless 0.2.0...
[INFO] documenting lockless-0.2.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate lockless 0.2.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate lockless 0.2.0 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 lockless 0.2.0
[INFO] finished tweaking crates.io crate lockless 0.2.0
[INFO] tweaked toml for crates.io crate lockless 0.2.0 written to /workspace/builds/worker-1/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] 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]  Downloading crates ...
[INFO] [stderr]   Downloaded parking_lot v0.3.8
[INFO] [stderr]   Downloaded owning_ref v0.2.4
[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" "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] a4cdd5cd2bf8b3b71105495cc7cfcf9bd906129053844ca1b1afe41fe0e67dbd
[INFO] running `Command { std: "docker" "start" "-a" "a4cdd5cd2bf8b3b71105495cc7cfcf9bd906129053844ca1b1afe41fe0e67dbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a4cdd5cd2bf8b3b71105495cc7cfcf9bd906129053844ca1b1afe41fe0e67dbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4cdd5cd2bf8b3b71105495cc7cfcf9bd906129053844ca1b1afe41fe0e67dbd", kill_on_drop: false }`
[INFO] [stdout] a4cdd5cd2bf8b3b71105495cc7cfcf9bd906129053844ca1b1afe41fe0e67dbd
[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" "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] f58660641df92a26a384c8343f0e4932c5f3c07711bcf48f3b42b4e71dc4cd9f
[INFO] running `Command { std: "docker" "start" "-a" "f58660641df92a26a384c8343f0e4932c5f3c07711bcf48f3b42b4e71dc4cd9f", 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]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking owning_ref v0.2.4
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking thread-id v3.3.0
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking parking_lot v0.3.8
[INFO] [stderr]  Documenting lockless v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `lockless`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name lockless src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b0c814dea9fe04f6 -L dependency=/opt/rustwide/target/debug/deps --extern futures=/opt/rustwide/target/debug/deps/libfutures-34937b916995a2ad.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-7d2da0df9edc1198.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f58660641df92a26a384c8343f0e4932c5f3c07711bcf48f3b42b4e71dc4cd9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f58660641df92a26a384c8343f0e4932c5f3c07711bcf48f3b42b4e71dc4cd9f", kill_on_drop: false }`
[INFO] [stdout] f58660641df92a26a384c8343f0e4932c5f3c07711bcf48f3b42b4e71dc4cd9f