[INFO] fetching crate itertools 0.10.3...
[INFO] documenting itertools-0.10.3 against try#6fd27704e643b25711e6a97ec2b04873b411b97d for pr-96676
[INFO] extracting crate itertools 0.10.3 into /workspace/builds/worker-43/source
[INFO] validating manifest of crates.io crate itertools 0.10.3 on toolchain 6fd27704e643b25711e6a97ec2b04873b411b97d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate itertools 0.10.3
[INFO] finished tweaking crates.io crate itertools 0.10.3
[INFO] tweaked toml for crates.io crate itertools 0.10.3 written to /workspace/builds/worker-43/source/Cargo.toml
[INFO] crate crates.io crate itertools 0.10.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/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" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 104440eee4fcab3f7c29ea165fd56761d86c1bf228b99316969ab4f2369316d2
[INFO] running `Command { std: "docker" "start" "-a" "104440eee4fcab3f7c29ea165fd56761d86c1bf228b99316969ab4f2369316d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "104440eee4fcab3f7c29ea165fd56761d86c1bf228b99316969ab4f2369316d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "104440eee4fcab3f7c29ea165fd56761d86c1bf228b99316969ab4f2369316d2", kill_on_drop: false }`
[INFO] [stdout] 104440eee4fcab3f7c29ea165fd56761d86c1bf228b99316969ab4f2369316d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-43/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=forbid" "-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" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 16c2f977976512e182586e2f80fc834fd6dcff0d2629ec3435c3ba1a0712945b
[INFO] running `Command { std: "docker" "start" "-a" "16c2f977976512e182586e2f80fc834fd6dcff0d2629ec3435c3ba1a0712945b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]  Documenting itertools v0.10.3 (/opt/rustwide/workdir)
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]   --> src/ziptuple.rs:23:14
[INFO] [stdout]    |
[INFO] [stdout] 23 | /// Prefer [`izip!()`] over `multizip` for the performance benefits of using the
[INFO] [stdout]    |              ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(rustdoc::macro_rules_fallback)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: Rust code block is empty
[INFO] [stdout]     --> src/lib.rs:2695:9
[INFO] [stdout]      |
[INFO] [stdout] 2695 |     /// ```
[INFO] [stdout]      |         ^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(rustdoc::invalid_rust_codeblocks)]` on by default
[INFO] [stdout] help: mark blocks that do not contain Rust code as text
[INFO] [stdout]      |
[INFO] [stdout] 2695 |     /// ```text
[INFO] [stdout]      |            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `itertools`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name itertools src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="use_alloc"' --cfg 'feature="use_std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=883062896482d30d -L dependency=/opt/rustwide/target/debug/deps --extern either=/opt/rustwide/target/debug/deps/libeither-2e2e5d9f01684535.rmeta --cap-lints=forbid --crate-version 0.10.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "16c2f977976512e182586e2f80fc834fd6dcff0d2629ec3435c3ba1a0712945b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16c2f977976512e182586e2f80fc834fd6dcff0d2629ec3435c3ba1a0712945b", kill_on_drop: false }`
[INFO] [stdout] 16c2f977976512e182586e2f80fc834fd6dcff0d2629ec3435c3ba1a0712945b