[INFO] fetching crate fixed_len_str_example 0.2.5...
[INFO] documenting fixed_len_str_example-0.2.5 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate fixed_len_str_example 0.2.5 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fixed_len_str_example 0.2.5 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fixed_len_str v0.3.3
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 72e29a911eeed6706df7c8ae3398e45d68b84a3550f5dcd5b5110512a7482dd2
[INFO] running `Command { std: "docker" "start" "-a" "72e29a911eeed6706df7c8ae3398e45d68b84a3550f5dcd5b5110512a7482dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "72e29a911eeed6706df7c8ae3398e45d68b84a3550f5dcd5b5110512a7482dd2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72e29a911eeed6706df7c8ae3398e45d68b84a3550f5dcd5b5110512a7482dd2", kill_on_drop: false }`
[INFO] [stdout] 72e29a911eeed6706df7c8ae3398e45d68b84a3550f5dcd5b5110512a7482dd2
[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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc80069140d2144f9c9c8f0753051c70cd3c553f143c7485957e6076156c220e
[INFO] running `Command { std: "docker" "start" "-a" "fc80069140d2144f9c9c8f0753051c70cd3c553f143c7485957e6076156c220e", 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 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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(pattern)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern fixed_len_str=/opt/rustwide/target/debug/deps/libfixed_len_str-310f1c3c2e6b185b.so --extern serde=/opt/rustwide/target/debug/deps/libserde-6a5809dcce96c926.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "fc80069140d2144f9c9c8f0753051c70cd3c553f143c7485957e6076156c220e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc80069140d2144f9c9c8f0753051c70cd3c553f143c7485957e6076156c220e", kill_on_drop: false }`
[INFO] [stdout] fc80069140d2144f9c9c8f0753051c70cd3c553f143c7485957e6076156c220e
