[INFO] fetching crate fncmd-impl 2.1.0...
[INFO] documenting fncmd-impl-2.1.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate fncmd-impl 2.1.0 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate fncmd-impl 2.1.0 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fncmd-impl 2.1.0
[INFO] finished tweaking crates.io crate fncmd-impl 2.1.0
[INFO] tweaked toml for crates.io crate fncmd-impl 2.1.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cargo_metadata v0.15.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2b0b8230d1d32dbc38600bb81dac7a3d79e17bdd864cc62573a2902a77f38778
[INFO] running `Command { std: "docker" "start" "-a" "2b0b8230d1d32dbc38600bb81dac7a3d79e17bdd864cc62573a2902a77f38778", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b0b8230d1d32dbc38600bb81dac7a3d79e17bdd864cc62573a2902a77f38778", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b0b8230d1d32dbc38600bb81dac7a3d79e17bdd864cc62573a2902a77f38778", kill_on_drop: false }`
[INFO] [stdout] 2b0b8230d1d32dbc38600bb81dac7a3d79e17bdd864cc62573a2902a77f38778
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17e62448e0ee0b2709502e838dd23576025be91487709c2a91975bd5f4830741
[INFO] running `Command { std: "docker" "start" "-a" "17e62448e0ee0b2709502e838dd23576025be91487709c2a91975bd5f4830741", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling serde v1.0.195
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling serde_json v1.0.111
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling camino v1.1.6
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling semver v1.0.21
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]    Compiling thiserror v1.0.56
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.195
[INFO] [stderr]    Compiling thiserror-impl v1.0.56
[INFO] [stderr]     Checking darling_core v0.13.4
[INFO] [stderr]     Checking proc-macro-error v1.0.4
[INFO] [stderr]    Compiling darling_macro v0.13.4
[INFO] [stderr]     Checking darling v0.13.4
[INFO] [stderr]     Checking cargo-platform v0.1.6
[INFO] [stderr]     Checking cargo_metadata v0.15.4
[INFO] [stderr]  Documenting fncmd-impl v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_span)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `fncmd-impl`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2021 --crate-type proc-macro --crate-name fncmd_impl src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=03afeb77ae7c57d8 -L dependency=/opt/rustwide/target/debug/deps --extern cargo_metadata=/opt/rustwide/target/debug/deps/libcargo_metadata-788d7b82d2abc38a.rmeta --extern darling=/opt/rustwide/target/debug/deps/libdarling-f7489cb4786b83d6.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-a36e91fa3e8f38e0.rmeta --extern proc_macro_error=/opt/rustwide/target/debug/deps/libproc_macro_error-e25d54dd793d118c.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-3889f6209a44556f.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-b5c91c32bf6deb64.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-f7ed822a6eac8d8b.rmeta --extern proc_macro --cap-lints=warn --crate-version 2.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "17e62448e0ee0b2709502e838dd23576025be91487709c2a91975bd5f4830741", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17e62448e0ee0b2709502e838dd23576025be91487709c2a91975bd5f4830741", kill_on_drop: false }`
[INFO] [stdout] 17e62448e0ee0b2709502e838dd23576025be91487709c2a91975bd5f4830741
