[INFO] fetching crate secp256kfun 0.2.4...
[INFO] documenting secp256kfun-0.2.4 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate secp256kfun 0.2.4 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate secp256kfun 0.2.4 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate secp256kfun 0.2.4
[INFO] finished tweaking crates.io crate secp256kfun 0.2.4
[INFO] tweaked toml for crates.io crate secp256kfun 0.2.4 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate secp256kfun 0.2.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--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 grin_secp256k1zkp v0.7.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 92463da57769b4c5b2e3b83c96240fe452d3d911574984f78e705b22b3c8bd89
[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" "92463da57769b4c5b2e3b83c96240fe452d3d911574984f78e705b22b3c8bd89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "92463da57769b4c5b2e3b83c96240fe452d3d911574984f78e705b22b3c8bd89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92463da57769b4c5b2e3b83c96240fe452d3d911574984f78e705b22b3c8bd89", kill_on_drop: false }`
[INFO] [stdout] 92463da57769b4c5b2e3b83c96240fe452d3d911574984f78e705b22b3c8bd89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4eaea002f1a85ca917b76d3bad42b1548972eee2419861bbaa6e0ef7846393f8
[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" "4eaea002f1a85ca917b76d3bad42b1548972eee2419861bbaa6e0ef7846393f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling secp256kfun_parity_backend v0.1.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling secp256kfun v0.2.4 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting secp256kfun v0.2.4 (/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(rustc_attrs, min_specialization, external_doc)]
[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 `secp256kfun`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name secp256kfun src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="alloc"' --cfg 'feature="default"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern digest=/opt/rustwide/target/debug/deps/libdigest-568ed0d07248be32.rmeta --extern rand_core=/opt/rustwide/target/debug/deps/librand_core-d7f9a3a2e8f55edb.rmeta --extern parity_backend=/opt/rustwide/target/debug/deps/libsecp256kfun_parity_backend-8c7127e9a77f6b89.rmeta --extern subtle=/opt/rustwide/target/debug/deps/libsubtle-b660f96d5b04fd07.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "4eaea002f1a85ca917b76d3bad42b1548972eee2419861bbaa6e0ef7846393f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4eaea002f1a85ca917b76d3bad42b1548972eee2419861bbaa6e0ef7846393f8", kill_on_drop: false }`
[INFO] [stdout] 4eaea002f1a85ca917b76d3bad42b1548972eee2419861bbaa6e0ef7846393f8