[INFO] fetching crate cairo-svgpath 0.1.1...
[INFO] documenting cairo-svgpath-0.1.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate cairo-svgpath 0.1.1 into /workspace/builds/worker-75/source
[INFO] validating manifest of crates.io crate cairo-svgpath 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 cairo-svgpath 0.1.1
[INFO] finished tweaking crates.io crate cairo-svgpath 0.1.1
[INFO] tweaked toml for crates.io crate cairo-svgpath 0.1.1 written to /workspace/builds/worker-75/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 float-cmp v0.5.3
[INFO] [stderr]   Downloaded lyon_geom v0.12.7
[INFO] [stderr]   Downloaded euclid_macros v0.1.0
[INFO] [stderr]   Downloaded svgtypes v0.4.4
[INFO] [stderr]   Downloaded euclid v0.19.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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] 1f09138c5e7592a66bfbe2bb12b9e65f8c95c87149de9ce28d6d2b53a91a8c28
[INFO] running `Command { std: "docker" "start" "-a" "1f09138c5e7592a66bfbe2bb12b9e65f8c95c87149de9ce28d6d2b53a91a8c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f09138c5e7592a66bfbe2bb12b9e65f8c95c87149de9ce28d6d2b53a91a8c28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f09138c5e7592a66bfbe2bb12b9e65f8c95c87149de9ce28d6d2b53a91a8c28", kill_on_drop: false }`
[INFO] [stdout] 1f09138c5e7592a66bfbe2bb12b9e65f8c95c87149de9ce28d6d2b53a91a8c28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-75/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] d0372ffcfc624c4b797019340c47b9042bc5e8615f2d74ddf08ef72b971d282c
[INFO] running `Command { std: "docker" "start" "-a" "d0372ffcfc624c4b797019340c47b9042bc5e8615f2d74ddf08ef72b971d282c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking siphasher v0.2.3
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking nodrop v0.1.14
[INFO] [stderr]     Checking float-cmp v0.5.3
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking phf_shared v0.7.24
[INFO] [stderr]     Checking phf v0.7.24
[INFO] [stderr]     Checking svgtypes v0.4.4
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]    Compiling euclid_macros v0.1.0
[INFO] [stderr]     Checking euclid v0.19.9
[INFO] [stderr]     Checking lyon_geom v0.12.7
[INFO] [stderr]  Documenting cairo-svgpath v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.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 `cairo-svgpath`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name cairo_svgpath src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=3707494eeec1f91f -L dependency=/opt/rustwide/target/debug/deps --extern euclid=/opt/rustwide/target/debug/deps/libeuclid-7b93226234f7722f.rmeta --extern lyon_geom=/opt/rustwide/target/debug/deps/liblyon_geom-4abe6744fde1c273.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-42b8f402e5615b33.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-45a3d718982da057.rmeta --extern svgtypes=/opt/rustwide/target/debug/deps/libsvgtypes-973660737fafab34.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-3153ab381cc6ed78.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d0372ffcfc624c4b797019340c47b9042bc5e8615f2d74ddf08ef72b971d282c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0372ffcfc624c4b797019340c47b9042bc5e8615f2d74ddf08ef72b971d282c", kill_on_drop: false }`
[INFO] [stdout] d0372ffcfc624c4b797019340c47b9042bc5e8615f2d74ddf08ef72b971d282c