[INFO] fetching crate fixed_len_str_example 0.2.5...
[INFO] documenting fixed_len_str_example-0.2.5 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate fixed_len_str_example 0.2.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate fixed_len_str_example 0.2.5 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fixed_len_str_example 0.2.5
[INFO] finished tweaking crates.io crate fixed_len_str_example 0.2.5
[INFO] tweaked toml for crates.io crate fixed_len_str_example 0.2.5 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 235320be48070e2e03348ee0a50a7739e01125e2918a54caf11e38c4a2b29d0c
[INFO] running `Command { std: "docker" "start" "-a" "235320be48070e2e03348ee0a50a7739e01125e2918a54caf11e38c4a2b29d0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "235320be48070e2e03348ee0a50a7739e01125e2918a54caf11e38c4a2b29d0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "235320be48070e2e03348ee0a50a7739e01125e2918a54caf11e38c4a2b29d0c", kill_on_drop: false }`
[INFO] [stdout] 235320be48070e2e03348ee0a50a7739e01125e2918a54caf11e38c4a2b29d0c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 353d637f8b69d8d51a8c703df3582c6503d1365a1280c22353b802a83d4ea8a8
[INFO] running `Command { std: "docker" "start" "-a" "353d637f8b69d8d51a8c703df3582c6503d1365a1280c22353b802a83d4ea8a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]    Compiling fixed_len_str v0.3.3
[INFO] [stderr]  Documenting fixed_len_str_example v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(pattern)]
[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 `fixed_len_str_example`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name fixed_len_str_example src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=fce859c32b577b3b -L dependency=/opt/rustwide/target/debug/deps --extern fixed_len_str=/opt/rustwide/target/debug/deps/libfixed_len_str-ec2dfac8e0829338.so --extern serde=/opt/rustwide/target/debug/deps/libserde-dbdb529db862b224.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "353d637f8b69d8d51a8c703df3582c6503d1365a1280c22353b802a83d4ea8a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "353d637f8b69d8d51a8c703df3582c6503d1365a1280c22353b802a83d4ea8a8", kill_on_drop: false }`
[INFO] [stdout] 353d637f8b69d8d51a8c703df3582c6503d1365a1280c22353b802a83d4ea8a8