[INFO] fetching crate oak 0.8.0...
[INFO] documenting oak-0.8.0 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate oak 0.8.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate oak 0.8.0 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 oak 0.8.0
[INFO] finished tweaking crates.io crate oak 0.8.0
[INFO] tweaked toml for crates.io crate oak 0.8.0 written to /workspace/builds/worker-5-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 oak_runtime v0.6.0
[INFO] [stderr]   Downloaded syntex_pos v0.58.1
[INFO] [stderr]   Downloaded partial v0.2.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 0094f594e9d5b1c63d35fc95ae2a18b7e6876bb3eb61166cd4920254f3374ebd
[INFO] running `Command { std: "docker" "start" "-a" "0094f594e9d5b1c63d35fc95ae2a18b7e6876bb3eb61166cd4920254f3374ebd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0094f594e9d5b1c63d35fc95ae2a18b7e6876bb3eb61166cd4920254f3374ebd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0094f594e9d5b1c63d35fc95ae2a18b7e6876bb3eb61166cd4920254f3374ebd", kill_on_drop: false }`
[INFO] [stdout] 0094f594e9d5b1c63d35fc95ae2a18b7e6876bb3eb61166cd4920254f3374ebd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 62098af705eaa48f6314bc9f3073b33fada2737faeadda1716a8faf1e80f5311
[INFO] running `Command { std: "docker" "start" "-a" "62098af705eaa48f6314bc9f3073b33fada2737faeadda1716a8faf1e80f5311", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking partial v0.2.3
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking syn v1.0.109
[INFO] [stderr]  Documenting oak v0.8.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/liboak/lib.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(proc_macro_diagnostic, proc_macro_span)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/liboak/lib.rs:17:35
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(proc_macro_diagnostic, proc_macro_span)]
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^
[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 `oak`
[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 --crate-type proc-macro --crate-name oak src/liboak/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=205f38d3b9e24549 -L dependency=/opt/rustwide/target/debug/deps --extern partial=/opt/rustwide/target/debug/deps/libpartial-2d27de9a7f860618.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-fb557cacddf5e900.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-c1b23262c42f6b89.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-b2076d88f5e1e0ec.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.8.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "62098af705eaa48f6314bc9f3073b33fada2737faeadda1716a8faf1e80f5311", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62098af705eaa48f6314bc9f3073b33fada2737faeadda1716a8faf1e80f5311", kill_on_drop: false }`
[INFO] [stdout] 62098af705eaa48f6314bc9f3073b33fada2737faeadda1716a8faf1e80f5311
