[INFO] fetching crate fixed_len_str_example 0.2.5...
[INFO] documenting fixed_len_str_example-0.2.5 against 1.61.0 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 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 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" "+1.61.0" "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" "+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 fixed_len_str v0.3.3
[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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 752d82ebbcda0b78be8389d8e3df8520b6412f7b7157bb5ffd2d208a8075addf
[INFO] running `Command { std: "docker" "start" "-a" "752d82ebbcda0b78be8389d8e3df8520b6412f7b7157bb5ffd2d208a8075addf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "752d82ebbcda0b78be8389d8e3df8520b6412f7b7157bb5ffd2d208a8075addf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "752d82ebbcda0b78be8389d8e3df8520b6412f7b7157bb5ffd2d208a8075addf", kill_on_drop: false }`
[INFO] [stdout] 752d82ebbcda0b78be8389d8e3df8520b6412f7b7157bb5ffd2d208a8075addf
[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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 02a48c35041d86eceab753552cf37f87dc6c66f2cfac67f0f6c8d857a859e950
[INFO] running `Command { std: "docker" "start" "-a" "02a48c35041d86eceab753552cf37f87dc6c66f2cfac67f0f6c8d857a859e950", 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] [stderr] error: could not document `fixed_len_str_example`
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(pattern)]
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[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=5413d400dfcb0b50 -L dependency=/opt/rustwide/target/debug/deps --extern fixed_len_str=/opt/rustwide/target/debug/deps/libfixed_len_str-9e2a14235f6cc87c.so --extern serde=/opt/rustwide/target/debug/deps/libserde-495ec9fdc6b7531e.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "02a48c35041d86eceab753552cf37f87dc6c66f2cfac67f0f6c8d857a859e950", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "02a48c35041d86eceab753552cf37f87dc6c66f2cfac67f0f6c8d857a859e950", kill_on_drop: false }`
[INFO] [stdout] 02a48c35041d86eceab753552cf37f87dc6c66f2cfac67f0f6c8d857a859e950