[INFO] fetching crate flips 0.2.1...
[INFO] documenting flips-0.2.1 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate flips 0.2.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate flips 0.2.1 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 flips 0.2.1
[INFO] finished tweaking crates.io crate flips 0.2.1
[INFO] tweaked toml for crates.io crate flips 0.2.1 written to /workspace/builds/worker-3-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] [stderr]     Updating crates.io index
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded flips-sys v0.2.1
[INFO] [stderr]   Downloaded err-derive v0.2.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] babb010ad86778da4744e496a8c172feecbb9bb67445bb82dc3be94b087985a9
[INFO] running `Command { std: "docker" "start" "-a" "babb010ad86778da4744e496a8c172feecbb9bb67445bb82dc3be94b087985a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "babb010ad86778da4744e496a8c172feecbb9bb67445bb82dc3be94b087985a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "babb010ad86778da4744e496a8c172feecbb9bb67445bb82dc3be94b087985a9", kill_on_drop: false }`
[INFO] [stdout] babb010ad86778da4744e496a8c172feecbb9bb67445bb82dc3be94b087985a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 7109f955d38bd42280894d09f98b9d081aff3fc5d6d717abe08b24f445c7411a
[INFO] running `Command { std: "docker" "start" "-a" "7109f955d38bd42280894d09f98b9d081aff3fc5d6d717abe08b24f445c7411a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]    Compiling flips-sys v0.2.1
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]  Documenting flips v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.41s
[INFO] [stderr]    Generated /opt/rustwide/target/doc/flips/index.html
[INFO] running `Command { std: "docker" "inspect" "7109f955d38bd42280894d09f98b9d081aff3fc5d6d717abe08b24f445c7411a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7109f955d38bd42280894d09f98b9d081aff3fc5d6d717abe08b24f445c7411a", kill_on_drop: false }`
[INFO] [stdout] 7109f955d38bd42280894d09f98b9d081aff3fc5d6d717abe08b24f445c7411a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "RUSTC_BOOTSTRAP=1" "-e" "DOCS_RS=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "rustdoc" "--lib" "-Zrustdoc-map" "--features" "_doc" "-Z" "unstable-options" "--config" "build.rustdocflags=[\"-Z\", \"unstable-options\", \"--document-private-items\"]" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34413dfa6242c5d031401ecf00bb96ec6d605ebfcf93627ab94271d2b8ad6a10
[INFO] running `Command { std: "docker" "start" "-a" "34413dfa6242c5d031401ecf00bb96ec6d605ebfcf93627ab94271d2b8ad6a10", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]  Documenting flips v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]   --> src/lib.rs:37:48
[INFO] [stdout]    |
[INFO] [stdout] 37 | #![cfg_attr(feature = "_doc", feature(doc_cfg, external_doc))]
[INFO] [stdout]    |                                                ^^^^^^^^^^^^ feature has been removed
[INFO] [stdout]    |
[INFO] [stdout]    = note: use #[doc = include_str!("filename")] instead, which handles macro invocations
[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 `flips`
[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 --edition=2018 --crate-type lib --crate-name flips src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="_doc"' --cfg 'feature="default"' --cfg 'feature="err-derive"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat -C metadata=639fc27867d003ba -L dependency=/opt/rustwide/target/debug/deps --extern err_derive=/opt/rustwide/target/debug/deps/liberr_derive-dbd426aa14ac74af.so --extern flips_sys=/opt/rustwide/target/debug/deps/libflips_sys-235102fca7389de1.rmeta --extern-html-root-url 'err_derive=https://docs.rs/err-derive/0.2.4/' --extern-html-root-url 'flips_sys=https://docs.rs/flips-sys/0.2.1/' -Zunstable-options --cap-lints=warn --crate-version 0.2.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "34413dfa6242c5d031401ecf00bb96ec6d605ebfcf93627ab94271d2b8ad6a10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34413dfa6242c5d031401ecf00bb96ec6d605ebfcf93627ab94271d2b8ad6a10", kill_on_drop: false }`
[INFO] [stdout] 34413dfa6242c5d031401ecf00bb96ec6d605ebfcf93627ab94271d2b8ad6a10
