[INFO] fetching crate notedown_ast 0.16.2...
[INFO] documenting notedown_ast-0.16.2 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate notedown_ast 0.16.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate notedown_ast 0.16.2 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 notedown_ast 0.16.2
[INFO] finished tweaking crates.io crate notedown_ast 0.16.2
[INFO] tweaked toml for crates.io crate notedown_ast 0.16.2 written to /workspace/builds/worker-0/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] 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 textwrap v0.14.2
[INFO] [stderr]   Downloaded yggdrasil-shared v0.2.2
[INFO] [stderr]   Downloaded rust_decimal v1.23.1
[INFO] [stderr]   Downloaded lazy_static v0.1.16
[INFO] [stderr]   Downloaded notedown-error v1.1.7
[INFO] [stderr]   Downloaded css-color-parser v0.1.2
[INFO] [stderr]   Downloaded text-utils v0.4.3
[INFO] [stderr]   Downloaded html-escape v0.2.11
[INFO] [stderr]   Downloaded emojic v0.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 755b9f744d867020c57e70880b6e06048f18de04d397da195fadea4223712f14
[INFO] running `Command { std: "docker" "start" "-a" "755b9f744d867020c57e70880b6e06048f18de04d397da195fadea4223712f14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "755b9f744d867020c57e70880b6e06048f18de04d397da195fadea4223712f14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "755b9f744d867020c57e70880b6e06048f18de04d397da195fadea4223712f14", kill_on_drop: false }`
[INFO] [stdout] 755b9f744d867020c57e70880b6e06048f18de04d397da195fadea4223712f14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 51455e3a438f696b29c36eb9dbb7aa1ec859f3b62d5b7599aa7808a40154a46e
[INFO] running `Command { std: "docker" "start" "-a" "51455e3a438f696b29c36eb9dbb7aa1ec859f3b62d5b7599aa7808a40154a46e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling regex-syntax v0.6.26
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]     Checking str_indices v0.4.0
[INFO] [stderr]    Compiling rust_decimal v1.23.1
[INFO] [stderr]     Checking yansi v0.5.1
[INFO] [stderr]     Checking smawk v0.3.1
[INFO] [stderr]     Checking lazy_static v0.1.16
[INFO] [stderr]     Checking arrayvec v0.7.2
[INFO] [stderr]     Checking unidecode v0.3.0
[INFO] [stderr]     Checking utf8-width v0.1.6
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling indexmap v1.8.2
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking css-color-parser v0.1.2
[INFO] [stderr]     Checking ropey v1.5.0
[INFO] [stderr]     Checking html-escape v0.2.11
[INFO] [stderr]     Checking ariadne v0.1.5
[INFO] [stderr]    Compiling ahash v0.7.6
[INFO] [stderr]     Checking slugify v0.1.0
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]     Checking yggdrasil-shared v0.2.2
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]    Compiling regex v1.5.6
[INFO] [stderr]     Checking num-integer v0.1.45
[INFO] [stderr]     Checking num-complex v0.4.1
[INFO] [stderr]     Checking num-bigint v0.4.3
[INFO] [stderr]     Checking num-iter v0.1.43
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking emojic v0.4.0
[INFO] [stderr]     Checking num-rational v0.4.0
[INFO] [stderr]    Compiling unicode-linebreak v0.1.2
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking notedown-error v1.1.7
[INFO] [stderr]     Checking textwrap v0.14.2
[INFO] [stderr]     Checking text-utils v0.4.3
[INFO] [stderr]  Documenting notedown_ast v0.16.2 (/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(box_syntax)]
[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(map_first_last)]
[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(arbitrary_enum_discriminant)]
[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 `notedown_ast`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name notedown_ast src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f45f14f8f45fc498 -L dependency=/opt/rustwide/target/debug/deps --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-17b1f772209a84ff.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-c3e915a3b5e36158.rmeta --extern notedown_error=/opt/rustwide/target/debug/deps/libnotedown_error-e3e9bc358c29ff50.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-d06e52efc6657258.rmeta --extern rust_decimal=/opt/rustwide/target/debug/deps/librust_decimal-3b7cd672bd4966f2.rmeta --extern text_utils=/opt/rustwide/target/debug/deps/libtext_utils-18b65b3a425a797d.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-56996ab2af0158e3.rmeta --cap-lints=warn --crate-version 0.16.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "51455e3a438f696b29c36eb9dbb7aa1ec859f3b62d5b7599aa7808a40154a46e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "51455e3a438f696b29c36eb9dbb7aa1ec859f3b62d5b7599aa7808a40154a46e", kill_on_drop: false }`
[INFO] [stdout] 51455e3a438f696b29c36eb9dbb7aa1ec859f3b62d5b7599aa7808a40154a46e