[INFO] fetching crate enso-macro-utils 0.2.0...
[INFO] documenting enso-macro-utils-0.2.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate enso-macro-utils 0.2.0 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate enso-macro-utils 0.2.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enso-macro-utils 0.2.0
[INFO] finished tweaking crates.io crate enso-macro-utils 0.2.0
[INFO] tweaked toml for crates.io crate enso-macro-utils 0.2.0 written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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" "+beta-2021-08-01" "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-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff3cd3cc3f54d3472bfe99d451106d8fa090009115a91b03b2399ffa044d0b10
[INFO] running `Command { std: "docker" "start" "-a" "ff3cd3cc3f54d3472bfe99d451106d8fa090009115a91b03b2399ffa044d0b10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff3cd3cc3f54d3472bfe99d451106d8fa090009115a91b03b2399ffa044d0b10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff3cd3cc3f54d3472bfe99d451106d8fa090009115a91b03b2399ffa044d0b10", kill_on_drop: false }`
[INFO] [stdout] ff3cd3cc3f54d3472bfe99d451106d8fa090009115a91b03b2399ffa044d0b10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9814b3e92d8c4a4a98116d11481c516c5f1d13fd1c9fe70cc21a26375ffa120b
[INFO] running `Command { std: "docker" "start" "-a" "9814b3e92d8c4a4a98116d11481c516c5f1d13fd1c9fe70cc21a26375ffa120b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]  Documenting enso-macro-utils v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not document `enso-macro-utils`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-type rlib --crate-name enso_macro_utils src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-c395b40247ac8d91.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-901816f2d165e43f.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-048239a2ecaf741d.rmeta --cap-lints=warn --crate-version 0.2.0` (exit status: 1)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(trait_alias)]
[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] running `Command { std: "docker" "inspect" "9814b3e92d8c4a4a98116d11481c516c5f1d13fd1c9fe70cc21a26375ffa120b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9814b3e92d8c4a4a98116d11481c516c5f1d13fd1c9fe70cc21a26375ffa120b", kill_on_drop: false }`
[INFO] [stdout] 9814b3e92d8c4a4a98116d11481c516c5f1d13fd1c9fe70cc21a26375ffa120b
