[INFO] fetching crate guard 0.5.1...
[INFO] documenting guard-0.5.1 against try#6fd27704e643b25711e6a97ec2b04873b411b97d for pr-96676
[INFO] extracting crate guard 0.5.1 into /workspace/builds/worker-112/source
[INFO] validating manifest of crates.io crate guard 0.5.1 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 guard 0.5.1
[INFO] finished tweaking crates.io crate guard 0.5.1
[INFO] tweaked toml for crates.io crate guard 0.5.1 written to /workspace/builds/worker-112/source/Cargo.toml
[INFO] crate crates.io crate guard 0.5.1 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-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/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] f200feb94622f6bd666ce585300a900cf20cf759e9a6cc1f0d5c0a94b387a77b
[INFO] running `Command { std: "docker" "start" "-a" "f200feb94622f6bd666ce585300a900cf20cf759e9a6cc1f0d5c0a94b387a77b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f200feb94622f6bd666ce585300a900cf20cf759e9a6cc1f0d5c0a94b387a77b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f200feb94622f6bd666ce585300a900cf20cf759e9a6cc1f0d5c0a94b387a77b", kill_on_drop: false }`
[INFO] [stdout] f200feb94622f6bd666ce585300a900cf20cf759e9a6cc1f0d5c0a94b387a77b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-112/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] 17f7d45881da1bc637af8500af2cfb1738c4bd7c1615f5f98e6adb57dd13cd32
[INFO] running `Command { std: "docker" "start" "-a" "17f7d45881da1bc637af8500af2cfb1738c4bd7c1615f5f98e6adb57dd13cd32", kill_on_drop: false }`
[INFO] [stderr]  Documenting guard v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: macro_rules fallback is used during doc link resolution
[INFO] [stdout]   --> src/guard_unwrap.rs:22:56
[INFO] [stdout]    |
[INFO] [stdout] 22 | /// Here's an example of a failing match that causes [`guard_unwrap`] to panic.
[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 `guard`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name guard src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f60404d5a1320c5c -L dependency=/opt/rustwide/target/debug/deps --cap-lints=forbid --crate-version 0.5.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "17f7d45881da1bc637af8500af2cfb1738c4bd7c1615f5f98e6adb57dd13cd32", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17f7d45881da1bc637af8500af2cfb1738c4bd7c1615f5f98e6adb57dd13cd32", kill_on_drop: false }`
[INFO] [stdout] 17f7d45881da1bc637af8500af2cfb1738c4bd7c1615f5f98e6adb57dd13cd32