[INFO] fetching crate utf8-bufread 1.0.0...
[INFO] documenting utf8-bufread-1.0.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate utf8-bufread 1.0.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate utf8-bufread 1.0.0 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 utf8-bufread 1.0.0
[INFO] finished tweaking crates.io crate utf8-bufread 1.0.0
[INFO] tweaked toml for crates.io crate utf8-bufread 1.0.0 written to /workspace/builds/worker-2/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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 2a8550be3b15b611379dbfe58d5d8aff669f0133547e8b48b0f44271d0ce37f5
[INFO] running `Command { std: "docker" "start" "-a" "2a8550be3b15b611379dbfe58d5d8aff669f0133547e8b48b0f44271d0ce37f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a8550be3b15b611379dbfe58d5d8aff669f0133547e8b48b0f44271d0ce37f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a8550be3b15b611379dbfe58d5d8aff669f0133547e8b48b0f44271d0ce37f5", kill_on_drop: false }`
[INFO] [stdout] 2a8550be3b15b611379dbfe58d5d8aff669f0133547e8b48b0f44271d0ce37f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 7a4a0b24c229b9dac1c3e4b811bb1860e603dc69109f59f76bdbcbd47fc2576a
[INFO] running `Command { std: "docker" "start" "-a" "7a4a0b24c229b9dac1c3e4b811bb1860e603dc69109f59f76bdbcbd47fc2576a", kill_on_drop: false }`
[INFO] [stderr]  Documenting utf8-bufread v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lint `missing_crate_level_docs` has been renamed to `rustdoc::missing_crate_level_docs`
[INFO] [stdout]    --> src/lib.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 | #[deny(missing_crate_level_docs, missing_docs, missing_doc_code_examples)]
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `rustdoc::missing_crate_level_docs`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `missing_doc_code_examples` has been renamed to `rustdoc::missing_doc_code_examples`
[INFO] [stdout]    --> src/lib.rs:104:48
[INFO] [stdout]     |
[INFO] [stdout] 104 | #[deny(missing_crate_level_docs, missing_docs, missing_doc_code_examples)]
[INFO] [stdout]     |                                                ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `rustdoc::missing_doc_code_examples`
[INFO] [stdout] 
[INFO] [stdout] 
[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(option_result_unwrap_unchecked)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `utf8-bufread`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name utf8_bufread src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6cd55adda280fb9a -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 1.0.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "7a4a0b24c229b9dac1c3e4b811bb1860e603dc69109f59f76bdbcbd47fc2576a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a4a0b24c229b9dac1c3e4b811bb1860e603dc69109f59f76bdbcbd47fc2576a", kill_on_drop: false }`
[INFO] [stdout] 7a4a0b24c229b9dac1c3e4b811bb1860e603dc69109f59f76bdbcbd47fc2576a