[INFO] fetching crate crossbeam-channel 0.5.4...
[INFO] documenting crossbeam-channel-0.5.4 against try#6fd27704e643b25711e6a97ec2b04873b411b97d for pr-96676
[INFO] extracting crate crossbeam-channel 0.5.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate crossbeam-channel 0.5.4 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 crossbeam-channel 0.5.4
[INFO] finished tweaking crates.io crate crossbeam-channel 0.5.4
[INFO] tweaked toml for crates.io crate crossbeam-channel 0.5.4 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate crossbeam-channel 0.5.4 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 71d022bd68323cf12c0c16988d17b2af30522fb80a263a9b9252fd300a6b214e
[INFO] running `Command { std: "docker" "start" "-a" "71d022bd68323cf12c0c16988d17b2af30522fb80a263a9b9252fd300a6b214e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71d022bd68323cf12c0c16988d17b2af30522fb80a263a9b9252fd300a6b214e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71d022bd68323cf12c0c16988d17b2af30522fb80a263a9b9252fd300a6b214e", kill_on_drop: false }`
[INFO] [stdout] 71d022bd68323cf12c0c16988d17b2af30522fb80a263a9b9252fd300a6b214e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 2f8670458ed5317757f8f63259fa299b8659da90c6f468d70013a86baf2540ed
[INFO] running `Command { std: "docker" "start" "-a" "2f8670458ed5317757f8f63259fa299b8659da90c6f468d70013a86baf2540ed", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]  Documenting crossbeam-channel v0.5.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]    --> src/channel.rs:234:62
[INFO] [stdout]     |
[INFO] [stdout] 234 | /// Using a `never` channel to optionally add a timeout to [`select!`]:
[INFO] [stdout]     |                                                              ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(rustdoc::macro_rules_fallback)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]    --> src/select.rs:519:11
[INFO] [stdout]     |
[INFO] [stdout] 519 | /// The [`select!`] macro is a convenience wrapper around `Select`. However, it cannot select over a
[INFO] [stdout]     |           ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `crossbeam-channel`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name crossbeam_channel src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="crossbeam-utils"' --cfg 'feature="default"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=44c236c2c2a4810f -L dependency=/opt/rustwide/target/debug/deps --extern cfg_if=/opt/rustwide/target/debug/deps/libcfg_if-88879d2dc0fa106c.rmeta --extern crossbeam_utils=/opt/rustwide/target/debug/deps/libcrossbeam_utils-29020a11a4342d35.rmeta --cap-lints=forbid --crate-version 0.5.4` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2f8670458ed5317757f8f63259fa299b8659da90c6f468d70013a86baf2540ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f8670458ed5317757f8f63259fa299b8659da90c6f468d70013a86baf2540ed", kill_on_drop: false }`
[INFO] [stdout] 2f8670458ed5317757f8f63259fa299b8659da90c6f468d70013a86baf2540ed