[INFO] fetching crate fixed_len_str_example 0.2.5...
[INFO] documenting fixed_len_str_example-0.2.5 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate fixed_len_str_example 0.2.5 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate fixed_len_str_example 0.2.5 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "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-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" __CARGO_TEST_CHANNEL_OVERRIDE_DO_NOT_USE_THIS="nightly" "/workspace/cargo-home/bin/cargo" "+1.69.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c95f5a61aaab7e455eadefbc5768d93af93d9a42d87d9948d77bd8b0280b01a3
[INFO] running `Command { std: "docker" "start" "-a" "c95f5a61aaab7e455eadefbc5768d93af93d9a42d87d9948d77bd8b0280b01a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c95f5a61aaab7e455eadefbc5768d93af93d9a42d87d9948d77bd8b0280b01a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c95f5a61aaab7e455eadefbc5768d93af93d9a42d87d9948d77bd8b0280b01a3", kill_on_drop: false }`
[INFO] [stdout] c95f5a61aaab7e455eadefbc5768d93af93d9a42d87d9948d77bd8b0280b01a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f0a012029cda8bc4ed7e483d7c4084c6f701bf4ba2fe2c437ac9464e56351d8e
[INFO] running `Command { std: "docker" "start" "-a" "f0a012029cda8bc4ed7e483d7c4084c6f701bf4ba2fe2c437ac9464e56351d8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.160
[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 stable 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=8a910020d89be217 -L dependency=/opt/rustwide/target/debug/deps --extern fixed_len_str=/opt/rustwide/target/debug/deps/libfixed_len_str-0103cb58be8817a6.so --extern serde=/opt/rustwide/target/debug/deps/libserde-b6956e1a4b2bd63a.rmeta --cap-lints=warn --crate-version 0.2.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f0a012029cda8bc4ed7e483d7c4084c6f701bf4ba2fe2c437ac9464e56351d8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0a012029cda8bc4ed7e483d7c4084c6f701bf4ba2fe2c437ac9464e56351d8e", kill_on_drop: false }`
[INFO] [stdout] f0a012029cda8bc4ed7e483d7c4084c6f701bf4ba2fe2c437ac9464e56351d8e
