[INFO] fetching crate core2 0.4.0...
[INFO] documenting core2-0.4.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate core2 0.4.0 into /workspace/builds/worker-18/source
[INFO] validating manifest of crates.io crate core2 0.4.0 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 core2 0.4.0
[INFO] finished tweaking crates.io crate core2 0.4.0
[INFO] tweaked toml for crates.io crate core2 0.4.0 written to /workspace/builds/worker-18/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-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] 3b1d02ed9d7a47351f50b8b703a96c9e161ffdf7c660bf99e76d0af10d61f661
[INFO] running `Command { std: "docker" "start" "-a" "3b1d02ed9d7a47351f50b8b703a96c9e161ffdf7c660bf99e76d0af10d61f661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b1d02ed9d7a47351f50b8b703a96c9e161ffdf7c660bf99e76d0af10d61f661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b1d02ed9d7a47351f50b8b703a96c9e161ffdf7c660bf99e76d0af10d61f661", kill_on_drop: false }`
[INFO] [stdout] 3b1d02ed9d7a47351f50b8b703a96c9e161ffdf7c660bf99e76d0af10d61f661
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] c497aba57ab9250700c3de409ace0397a9df9a331102547171807a4c320cfff1
[INFO] running `Command { std: "docker" "start" "-a" "c497aba57ab9250700c3de409ace0397a9df9a331102547171807a4c320cfff1", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]  Documenting core2 v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.90s
[INFO] running `Command { std: "docker" "inspect" "c497aba57ab9250700c3de409ace0397a9df9a331102547171807a4c320cfff1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c497aba57ab9250700c3de409ace0397a9df9a331102547171807a4c320cfff1", kill_on_drop: false }`
[INFO] [stdout] c497aba57ab9250700c3de409ace0397a9df9a331102547171807a4c320cfff1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "DOCS_RS=1" "-e" "RUSTC_BOOTSTRAP=1" "-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" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "nightly" "--frozen" "--message-format=json" "--" "-Z" "unstable-options" "--document-private-items", kill_on_drop: false }`
[INFO] [stdout] 0c0be76171e74857f99da31f052424e353fc5583205fec1d941eaf78e5fbde39
[INFO] running `Command { std: "docker" "start" "-a" "0c0be76171e74857f99da31f052424e353fc5583205fec1d941eaf78e5fbde39", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]  Documenting core2 v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0635]: unknown feature `read_initializer`
[INFO] [stdout]  --> src/lib.rs:3:64
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![cfg_attr(all(feature = "std", feature = "nightly"), feature(read_initializer))]
[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 E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `core2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name core2 src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="alloc"' --cfg 'feature="default"' --cfg 'feature="nightly"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat -Z unstable-options --document-private-items -C metadata=ebef84aca8ee1b72 -L dependency=/opt/rustwide/target/debug/deps --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-5d07d3dc4f57ad41.rmeta --extern-html-root-url 'memchr=https://docs.rs/memchr/2.5.0/' -Zunstable-options --crate-version 0.4.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "0c0be76171e74857f99da31f052424e353fc5583205fec1d941eaf78e5fbde39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c0be76171e74857f99da31f052424e353fc5583205fec1d941eaf78e5fbde39", kill_on_drop: false }`
[INFO] [stdout] 0c0be76171e74857f99da31f052424e353fc5583205fec1d941eaf78e5fbde39