[INFO] fetching crate rust-ad-core 0.8.0...
[INFO] documenting rust-ad-core-0.8.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate rust-ad-core 0.8.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate rust-ad-core 0.8.0 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 rust-ad-core 0.8.0
[INFO] finished tweaking crates.io crate rust-ad-core 0.8.0
[INFO] tweaked toml for crates.io crate rust-ad-core 0.8.0 written to /workspace/builds/worker-2/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 61bc8428d0b48159a830ea670c6d1dc5f3c402654e8cfcef10f5be1a7cccf732
[INFO] running `Command { std: "docker" "start" "-a" "61bc8428d0b48159a830ea670c6d1dc5f3c402654e8cfcef10f5be1a7cccf732", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61bc8428d0b48159a830ea670c6d1dc5f3c402654e8cfcef10f5be1a7cccf732", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61bc8428d0b48159a830ea670c6d1dc5f3c402654e8cfcef10f5be1a7cccf732", kill_on_drop: false }`
[INFO] [stdout] 61bc8428d0b48159a830ea670c6d1dc5f3c402654e8cfcef10f5be1a7cccf732
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 0594135efb54953a488388a01288a31a19be80d0519be7777eb0368d16a24b1f
[INFO] running `Command { std: "docker" "start" "-a" "0594135efb54953a488388a01288a31a19be80d0519be7777eb0368d16a24b1f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]     Checking unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling const_format_proc_macros v0.2.22
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]    Compiling const_format v0.2.24
[INFO] [stderr]    Compiling rust-ad-consts v0.8.0
[INFO] [stderr]    Compiling rust-ad-core-macros v0.8.0
[INFO] [stderr]  Documenting rust-ad-core v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(iter_intersperse)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(adt_const_params)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `rust-ad-core`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name rust_ad_core src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=6d5e66e6bbdc4236 -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-9a84eb7803ab612a.rmeta --extern rust_ad_consts=/opt/rustwide/target/debug/deps/librust_ad_consts-c901745bdc1be104.rmeta --extern rust_ad_core_macros=/opt/rustwide/target/debug/deps/librust_ad_core_macros-7a5e7c46b4161314.so --extern syn=/opt/rustwide/target/debug/deps/libsyn-0a9e1b9c1a926118.rmeta --cap-lints=warn --crate-version 0.8.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "0594135efb54953a488388a01288a31a19be80d0519be7777eb0368d16a24b1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0594135efb54953a488388a01288a31a19be80d0519be7777eb0368d16a24b1f", kill_on_drop: false }`
[INFO] [stdout] 0594135efb54953a488388a01288a31a19be80d0519be7777eb0368d16a24b1f