[INFO] fetching crate iobuf 5.8.1...
[INFO] documenting iobuf-5.8.1 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate iobuf 5.8.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate iobuf 5.8.1 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate iobuf 5.8.1
[INFO] finished tweaking crates.io crate iobuf 5.8.1
[INFO] tweaked toml for crates.io crate iobuf 5.8.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: profile `doc` is deprecated and has no effect
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 484426dfce2a4f255223883298f695850844e565f2cdfd6f860e8bcb1be62e17
[INFO] running `Command { std: "docker" "start" "-a" "484426dfce2a4f255223883298f695850844e565f2cdfd6f860e8bcb1be62e17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "484426dfce2a4f255223883298f695850844e565f2cdfd6f860e8bcb1be62e17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "484426dfce2a4f255223883298f695850844e565f2cdfd6f860e8bcb1be62e17", kill_on_drop: false }`
[INFO] [stdout] 484426dfce2a4f255223883298f695850844e565f2cdfd6f860e8bcb1be62e17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b48350983dce528b57b8c121f2d088737cf492de02dc3f8b377cb5dc4c72504f
[INFO] running `Command { std: "docker" "start" "-a" "b48350983dce528b57b8c121f2d088737cf492de02dc3f8b377cb5dc4c72504f", kill_on_drop: false }`
[INFO] [stderr] warning: profile `doc` is deprecated and has no effect
[INFO] [stderr]  Documenting iobuf v5.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 | #![feature(plugin)]
[INFO] [stdout]    |            ^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: plugins are no longer supported
[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 E0557`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `iobuf`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --crate-type lib --crate-name iobuf src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=11bc5aff775b20d4 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 5.8.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "b48350983dce528b57b8c121f2d088737cf492de02dc3f8b377cb5dc4c72504f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b48350983dce528b57b8c121f2d088737cf492de02dc3f8b377cb5dc4c72504f", kill_on_drop: false }`
[INFO] [stdout] b48350983dce528b57b8c121f2d088737cf492de02dc3f8b377cb5dc4c72504f
