[INFO] fetching crate rdxl_scaffolding 0.1.1...
[INFO] documenting rdxl_scaffolding-0.1.1 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate rdxl_scaffolding 0.1.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate rdxl_scaffolding 0.1.1 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rdxl_scaffolding 0.1.1
[INFO] finished tweaking crates.io crate rdxl_scaffolding 0.1.1
[INFO] tweaked toml for crates.io crate rdxl_scaffolding 0.1.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate rdxl_scaffolding 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hermit-abi v0.1.14
[INFO] [stderr]   Downloaded html_parser v0.4.2
[INFO] [stderr]   Downloaded mxml_dep v0.1.3
[INFO] [stderr]   Downloaded proc-macro-error-attr v1.0.2
[INFO] [stderr]   Downloaded serde v1.0.113
[INFO] [stderr]   Downloaded proc-macro-error v1.0.2
[INFO] [stderr]   Downloaded anyhow v1.0.31
[INFO] [stderr]   Downloaded serde_derive v1.0.113
[INFO] [stderr]   Downloaded mxml v0.1.2
[INFO] [stderr]   Downloaded rdxl v0.5.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e1d5df1f18f814098232d95ece1a40048b418f6a7a5827972523f25ebe1527dc
[INFO] running `Command { std: "docker" "start" "-a" "e1d5df1f18f814098232d95ece1a40048b418f6a7a5827972523f25ebe1527dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e1d5df1f18f814098232d95ece1a40048b418f6a7a5827972523f25ebe1527dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e1d5df1f18f814098232d95ece1a40048b418f6a7a5827972523f25ebe1527dc", kill_on_drop: false }`
[INFO] [stdout] e1d5df1f18f814098232d95ece1a40048b418f6a7a5827972523f25ebe1527dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd58c66bb71ebf2a64ecd95d7529893b9bc1cd4c8f6e50d03ced61e5dacc8f2f
[INFO] running `Command { std: "docker" "start" "-a" "bd58c66bb71ebf2a64ecd95d7529893b9bc1cd4c8f6e50d03ced61e5dacc8f2f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.113
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling unicode-width v0.1.7
[INFO] [stderr]    Compiling serde v1.0.113
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling syn-mid v0.5.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling rdxl v0.5.5
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling structopt-derive v0.4.8
[INFO] [stderr]    Compiling thiserror v1.0.20
[INFO] [stderr]    Compiling structopt v0.3.15
[INFO] [stderr]    Compiling html_parser v0.4.2
[INFO] [stderr]    Compiling mxml_dep v0.1.3
[INFO] [stderr]    Compiling mxml v0.1.2
[INFO] [stderr]     Checking rdxl_scaffolding v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting rdxl_scaffolding v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/build_index.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_hygiene)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `rdxl_scaffolding`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type bin --crate-name build_index src/build_index.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=2a3e096b25daf43e -L dependency=/opt/rustwide/target/debug/deps --extern mxml=/opt/rustwide/target/debug/deps/libmxml-67a03b5257ae5a15.so --extern rdxl=/opt/rustwide/target/debug/deps/librdxl-9109e0bf5a55b5b8.so --extern rdxl_scaffolding=/opt/rustwide/target/debug/deps/librdxl_scaffolding-35bc4b9703609436.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "bd58c66bb71ebf2a64ecd95d7529893b9bc1cd4c8f6e50d03ced61e5dacc8f2f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd58c66bb71ebf2a64ecd95d7529893b9bc1cd4c8f6e50d03ced61e5dacc8f2f", kill_on_drop: false }`
[INFO] [stdout] bd58c66bb71ebf2a64ecd95d7529893b9bc1cd4c8f6e50d03ced61e5dacc8f2f
