[INFO] fetching crate unimock 0.2.0-beta.0...
[INFO] documenting unimock-0.2.0-beta.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate unimock 0.2.0-beta.0 into /workspace/builds/worker-37/source
[INFO] validating manifest of crates.io crate unimock 0.2.0-beta.0 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unimock 0.2.0-beta.0
[INFO] finished tweaking crates.io crate unimock 0.2.0-beta.0
[INFO] tweaked toml for crates.io crate unimock 0.2.0-beta.0 written to /workspace/builds/worker-37/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "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" "+1.61.0" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cool_asserts v1.1.1
[INFO] [stderr]   Downloaded unimock_macros v0.2.0-beta.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 21c9f1813564cb4d1d00ea86b226a5ee56178c749800a2bab8511bc7d6fefac7
[INFO] running `Command { std: "docker" "start" "-a" "21c9f1813564cb4d1d00ea86b226a5ee56178c749800a2bab8511bc7d6fefac7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21c9f1813564cb4d1d00ea86b226a5ee56178c749800a2bab8511bc7d6fefac7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21c9f1813564cb4d1d00ea86b226a5ee56178c749800a2bab8511bc7d6fefac7", kill_on_drop: false }`
[INFO] [stdout] 21c9f1813564cb4d1d00ea86b226a5ee56178c749800a2bab8511bc7d6fefac7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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=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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7545da17f6555346b5f7b89205e36566358aaaddd7529089e830194e8dda592
[INFO] running `Command { std: "docker" "start" "-a" "e7545da17f6555346b5f7b89205e36566358aaaddd7529089e830194e8dda592", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling unimock_macros v0.2.0-beta.0
[INFO] [stderr]  Documenting unimock v0.2.0-beta.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:258:1
[INFO] [stdout]     |
[INFO] [stdout] 258 | #![feature(generic_associated_types)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `unimock`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name unimock src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=7003ec04af38f1d0 -L dependency=/opt/rustwide/target/debug/deps --extern unimock_macros=/opt/rustwide/target/debug/deps/libunimock_macros-dca7877c0ec5c75b.so --cap-lints=warn --crate-version 0.2.0-beta.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e7545da17f6555346b5f7b89205e36566358aaaddd7529089e830194e8dda592", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7545da17f6555346b5f7b89205e36566358aaaddd7529089e830194e8dda592", kill_on_drop: false }`
[INFO] [stdout] e7545da17f6555346b5f7b89205e36566358aaaddd7529089e830194e8dda592