[INFO] fetching crate aml 0.16.1...
[INFO] documenting aml-0.16.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate aml 0.16.1 into /workspace/builds/worker-32/source
[INFO] validating manifest of crates.io crate aml 0.16.1 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 aml 0.16.1
[INFO] finished tweaking crates.io crate aml 0.16.1
[INFO] tweaked toml for crates.io crate aml 0.16.1 written to /workspace/builds/worker-32/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-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] eb36f09ce7e2a87f3ca763dbe308ead186af18acee30e94763967185d274c484
[INFO] running `Command { std: "docker" "start" "-a" "eb36f09ce7e2a87f3ca763dbe308ead186af18acee30e94763967185d274c484", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb36f09ce7e2a87f3ca763dbe308ead186af18acee30e94763967185d274c484", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb36f09ce7e2a87f3ca763dbe308ead186af18acee30e94763967185d274c484", kill_on_drop: false }`
[INFO] [stdout] eb36f09ce7e2a87f3ca763dbe308ead186af18acee30e94763967185d274c484
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] 26b130697bb43ef4d17a22d3343d7cfb6548b45cf03a1ff222d0f6fc51068f93
[INFO] running `Command { std: "docker" "start" "-a" "26b130697bb43ef4d17a22d3343d7cfb6548b45cf03a1ff222d0f6fc51068f93", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking funty v1.2.0
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking wyz v0.4.0
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]     Checking bitvec v0.22.3
[INFO] [stderr]     Checking spinning_top v0.2.4
[INFO] [stderr]  Documenting aml v0.16.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:39:1
[INFO] [stdout]    |
[INFO] [stdout] 39 | #![feature(decl_macro, type_ascription, box_syntax, bool_to_option)]
[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 `aml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name aml src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=c1995fa7e221d9c8 -L dependency=/opt/rustwide/target/debug/deps --extern bit_field=/opt/rustwide/target/debug/deps/libbit_field-c5dba2b92c455300.rmeta --extern bitvec=/opt/rustwide/target/debug/deps/libbitvec-10f8a45827830747.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-abfed71c265ad58b.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-11fcf639aa746c8b.rmeta --extern spinning_top=/opt/rustwide/target/debug/deps/libspinning_top-fcabae74269844ce.rmeta --cap-lints=warn --crate-version 0.16.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "26b130697bb43ef4d17a22d3343d7cfb6548b45cf03a1ff222d0f6fc51068f93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26b130697bb43ef4d17a22d3343d7cfb6548b45cf03a1ff222d0f6fc51068f93", kill_on_drop: false }`
[INFO] [stdout] 26b130697bb43ef4d17a22d3343d7cfb6548b45cf03a1ff222d0f6fc51068f93