[INFO] fetching crate cairo-svgpath 0.1.1...
[INFO] documenting cairo-svgpath-0.1.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate cairo-svgpath 0.1.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate cairo-svgpath 0.1.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc5bdfbed01828398ff91a59b548358edc4a8da6820aafbe1bac29ae4aa8ba98
[INFO] running `Command { std: "docker" "start" "-a" "dc5bdfbed01828398ff91a59b548358edc4a8da6820aafbe1bac29ae4aa8ba98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc5bdfbed01828398ff91a59b548358edc4a8da6820aafbe1bac29ae4aa8ba98", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc5bdfbed01828398ff91a59b548358edc4a8da6820aafbe1bac29ae4aa8ba98", kill_on_drop: false }`
[INFO] [stdout] dc5bdfbed01828398ff91a59b548358edc4a8da6820aafbe1bac29ae4aa8ba98
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ec876012d4d43993b4b17d99ee0f5ddd57c24f065fb7872f3f6e8440e4bab0b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1ec876012d4d43993b4b17d99ee0f5ddd57c24f065fb7872f3f6e8440e4bab0b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]     Checking unicode-xid v0.1.0
[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]     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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern euclid=/opt/rustwide/target/debug/deps/libeuclid-fb11cd5ba67f428f.rmeta --extern lyon_geom=/opt/rustwide/target/debug/deps/liblyon_geom-4e1315a5af80a650.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-75331ab43450a515.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-e90b0657ce0035c0.rmeta --extern svgtypes=/opt/rustwide/target/debug/deps/libsvgtypes-406865a9755db917.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-38b248729d3f7390.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "1ec876012d4d43993b4b17d99ee0f5ddd57c24f065fb7872f3f6e8440e4bab0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ec876012d4d43993b4b17d99ee0f5ddd57c24f065fb7872f3f6e8440e4bab0b", kill_on_drop: false }`
[INFO] [stdout] 1ec876012d4d43993b4b17d99ee0f5ddd57c24f065fb7872f3f6e8440e4bab0b
