[INFO] fetching crate rdxl_scaffolding 0.1.1...
[INFO] documenting rdxl_scaffolding-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate rdxl_scaffolding 0.1.1 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate rdxl_scaffolding 0.1.1 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 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-27/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: "/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]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v1.0.113
[INFO] [stderr]   Downloaded html_parser v0.4.2
[INFO] [stderr]   Downloaded serde_derive v1.0.113
[INFO] [stderr]   Downloaded mxml_dep v0.1.3
[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-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] 915395f5b1305c6755bb9982ddaf0ab4a7ff1cd920c858c5657a403ca4f6a9b9
[INFO] running `Command { std: "docker" "start" "-a" "915395f5b1305c6755bb9982ddaf0ab4a7ff1cd920c858c5657a403ca4f6a9b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "915395f5b1305c6755bb9982ddaf0ab4a7ff1cd920c858c5657a403ca4f6a9b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "915395f5b1305c6755bb9982ddaf0ab4a7ff1cd920c858c5657a403ca4f6a9b9", kill_on_drop: false }`
[INFO] [stdout] 915395f5b1305c6755bb9982ddaf0ab4a7ff1cd920c858c5657a403ca4f6a9b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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] b636e80aace8b205e0de18d81ccdbc362f6a874d405b920e8647554144908c8e
[INFO] running `Command { std: "docker" "start" "-a" "b636e80aace8b205e0de18d81ccdbc362f6a874d405b920e8647554144908c8e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling serde_derive v1.0.113
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling unicode-width v0.1.7
[INFO] [stderr]    Compiling serde v1.0.113
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling anyhow v1.0.31
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.2
[INFO] [stderr]    Compiling proc-macro-error v1.0.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling clap v2.33.1
[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: Compilation failed, aborting rustdoc
[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 `rdxl_scaffolding`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `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 -C metadata=364b1ea0b2cb90dc -L dependency=/opt/rustwide/target/debug/deps --extern mxml=/opt/rustwide/target/debug/deps/libmxml-e188cba2f7bfc2f7.so --extern rdxl=/opt/rustwide/target/debug/deps/librdxl-1c93bf3e4cb211d4.so --extern rdxl_scaffolding=/opt/rustwide/target/debug/deps/librdxl_scaffolding-714ed1c13db02712.rmeta --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "b636e80aace8b205e0de18d81ccdbc362f6a874d405b920e8647554144908c8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b636e80aace8b205e0de18d81ccdbc362f6a874d405b920e8647554144908c8e", kill_on_drop: false }`
[INFO] [stdout] b636e80aace8b205e0de18d81ccdbc362f6a874d405b920e8647554144908c8e