[INFO] fetching crate block2 0.2.0-alpha.3...
[INFO] documenting block2-0.2.0-alpha.3 against try#6fd27704e643b25711e6a97ec2b04873b411b97d for pr-96676
[INFO] extracting crate block2 0.2.0-alpha.3 into /workspace/builds/worker-70/source
[INFO] validating manifest of crates.io crate block2 0.2.0-alpha.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 block2 0.2.0-alpha.3
[INFO] finished tweaking crates.io crate block2 0.2.0-alpha.3
[INFO] tweaked toml for crates.io crate block2 0.2.0-alpha.3 written to /workspace/builds/worker-70/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6fd27704e643b25711e6a97ec2b04873b411b97d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-70/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-70/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] 8bb5878c22f32b7461dfce31be4b1532dbf5fb67f07e43ee81ef2786a3ba1808
[INFO] running `Command { std: "docker" "start" "-a" "8bb5878c22f32b7461dfce31be4b1532dbf5fb67f07e43ee81ef2786a3ba1808", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8bb5878c22f32b7461dfce31be4b1532dbf5fb67f07e43ee81ef2786a3ba1808", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8bb5878c22f32b7461dfce31be4b1532dbf5fb67f07e43ee81ef2786a3ba1808", kill_on_drop: false }`
[INFO] [stdout] 8bb5878c22f32b7461dfce31be4b1532dbf5fb67f07e43ee81ef2786a3ba1808
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-70/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-70/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] dc0c92a2d6847df87c6569380ec1719068579e0c82a3a3ed048c160944edb0f6
[INFO] running `Command { std: "docker" "start" "-a" "dc0c92a2d6847df87c6569380ec1719068579e0c82a3a3ed048c160944edb0f6", kill_on_drop: false }`
[INFO] [stderr]    Compiling block-sys v0.0.3
[INFO] [stderr]     Checking objc2-encode v2.0.0-beta.2
[INFO] [stderr]  Documenting block2 v0.2.0-alpha.3 (/opt/rustwide/workdir)
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]   --> src/global.rs:21:57
[INFO] [stdout]    |
[INFO] [stdout] 21 | /// stored in static memory using the [`global_block`][`global_block!`] macro.
[INFO] [stdout]    |                                                         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(rustdoc::macro_rules_fallback)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `block2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name block2 src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=bdc89150afd60f5b -L dependency=/opt/rustwide/target/debug/deps --extern block_sys=/opt/rustwide/target/debug/deps/libblock_sys-c8eac7b3e3a4172c.rmeta --extern objc2_encode=/opt/rustwide/target/debug/deps/libobjc2_encode-67ca689ce595b78d.rmeta --cap-lints=forbid --crate-version 0.2.0-alpha.3` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "dc0c92a2d6847df87c6569380ec1719068579e0c82a3a3ed048c160944edb0f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc0c92a2d6847df87c6569380ec1719068579e0c82a3a3ed048c160944edb0f6", kill_on_drop: false }`
[INFO] [stdout] dc0c92a2d6847df87c6569380ec1719068579e0c82a3a3ed048c160944edb0f6