[INFO] fetching crate idx_parser 0.3.0...
[INFO] documenting idx_parser-0.3.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate idx_parser 0.3.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate idx_parser 0.3.0 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 idx_parser 0.3.0
[INFO] finished tweaking crates.io crate idx_parser 0.3.0
[INFO] tweaked toml for crates.io crate idx_parser 0.3.0 written to /workspace/builds/worker-4/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 53eccde28a95fe59d4ee6d3080d61e14e730f6e8ec24691092855c2817a7640f
[INFO] running `Command { std: "docker" "start" "-a" "53eccde28a95fe59d4ee6d3080d61e14e730f6e8ec24691092855c2817a7640f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "53eccde28a95fe59d4ee6d3080d61e14e730f6e8ec24691092855c2817a7640f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53eccde28a95fe59d4ee6d3080d61e14e730f6e8ec24691092855c2817a7640f", kill_on_drop: false }`
[INFO] [stdout] 53eccde28a95fe59d4ee6d3080d61e14e730f6e8ec24691092855c2817a7640f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e1777bcb5c6feb3be8e27c3d363b3fe1e9d55b2c116b0b87a09d64bb03762d5c
[INFO] running `Command { std: "docker" "start" "-a" "e1777bcb5c6feb3be8e27c3d363b3fe1e9d55b2c116b0b87a09d64bb03762d5c", kill_on_drop: false }`
[INFO] [stderr]  Documenting idx_parser v0.3.0 (/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(array_chunks)]
[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 `idx_parser`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name idx_parser src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2d9e203558cb330a -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.3.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e1777bcb5c6feb3be8e27c3d363b3fe1e9d55b2c116b0b87a09d64bb03762d5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1777bcb5c6feb3be8e27c3d363b3fe1e9d55b2c116b0b87a09d64bb03762d5c", kill_on_drop: false }`
[INFO] [stdout] e1777bcb5c6feb3be8e27c3d363b3fe1e9d55b2c116b0b87a09d64bb03762d5c