[INFO] fetching crate maybe-dangling 0.1.0...
[INFO] documenting maybe-dangling-0.1.0 against beta-2023-10-21 for beta-1.74-rustdoc-1
[INFO] extracting crate maybe-dangling 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate maybe-dangling 0.1.0 on toolchain beta-2023-10-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-10-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-4-tc2/source/.cargo/config
[INFO] removed /workspace/builds/worker-4-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate maybe-dangling 0.1.0
[INFO] finished tweaking crates.io crate maybe-dangling 0.1.0
[INFO] tweaked toml for crates.io crate maybe-dangling 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-10-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-10-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:023092b8bfa974c7f3e45c5ce651cc8dd3afd5e76915d5995b8dacd3032bf956" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-10-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 019cddcd6b4475e495bc31f5477deb1c10b4dab7087db68c9c5559db94a00bca
[INFO] running `Command { std: "docker" "start" "-a" "019cddcd6b4475e495bc31f5477deb1c10b4dab7087db68c9c5559db94a00bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "019cddcd6b4475e495bc31f5477deb1c10b4dab7087db68c9c5559db94a00bca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "019cddcd6b4475e495bc31f5477deb1c10b4dab7087db68c9c5559db94a00bca", kill_on_drop: false }`
[INFO] [stdout] 019cddcd6b4475e495bc31f5477deb1c10b4dab7087db68c9c5559db94a00bca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:023092b8bfa974c7f3e45c5ce651cc8dd3afd5e76915d5995b8dacd3032bf956" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-10-21" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c1b943e63227f23292d0a0fe6f4a0986408903dcaca9e2ae4b1a5c23e6af7918
[INFO] running `Command { std: "docker" "start" "-a" "c1b943e63227f23292d0a0fe6f4a0986408903dcaca9e2ae4b1a5c23e6af7918", kill_on_drop: false }`
[INFO] [stderr]  Documenting maybe-dangling v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'cfg_match'
[INFO] [stdout]   --> src/maybe_dangling.rs:65:1
[INFO] [stdout]    |
[INFO] [stdout] 65 | crate::cfg_match! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #115585 <https://github.com/rust-lang/rust/issues/115585> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: no rules expected the token `feature`
[INFO] [stdout]   --> src/maybe_dangling.rs:66:5
[INFO] [stdout]    |
[INFO] [stdout] 66 |     feature = "nightly-dropck_eyepatch" => {
[INFO] [stdout]    |     ^^^^^^^ no rules expected this token in macro call
[INFO] [stdout]    |
[INFO] [stdout] note: while trying to match `cfg`
[INFO] [stdout]   --> /rustc/489647f984b2b3a5ee6b2a0d46a527c8d926ceae/library/core/src/macros/mod.rs:358:11
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0659]: `cfg_match` is ambiguous
[INFO] [stdout]   --> src/lib.rs:42:5
[INFO] [stdout]    |
[INFO] [stdout] 42 | use cfg_match;
[INFO] [stdout]    |     ^^^^^^^^^ ambiguous name
[INFO] [stdout]    |
[INFO] [stdout]    = note: ambiguous because of a conflict between a macro-expanded name and a less macro-expanded name from outer scope during import or macro resolution
[INFO] [stdout]    = note: `cfg_match` could refer to a macro from prelude
[INFO] [stdout] note: `cfg_match` could also refer to the macro defined here
[INFO] [stdout]   --> src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | / macro_rules! cfg_match {
[INFO] [stdout] 18 | |     (
[INFO] [stdout] 19 | |         _ => { $($expansion:tt)* } $(,)?
[INFO] [stdout] 20 | |     ) => (
[INFO] [stdout] ...  |
[INFO] [stdout] 40 | |     });
[INFO] [stdout] 41 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0658, E0659.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `maybe-dangling`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/beta-2023-10-21-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type lib --crate-name maybe_dangling 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=34c0a23258118407 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c1b943e63227f23292d0a0fe6f4a0986408903dcaca9e2ae4b1a5c23e6af7918", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1b943e63227f23292d0a0fe6f4a0986408903dcaca9e2ae4b1a5c23e6af7918", kill_on_drop: false }`
[INFO] [stdout] c1b943e63227f23292d0a0fe6f4a0986408903dcaca9e2ae4b1a5c23e6af7918