[INFO] cloning repository https://github.com/althonos/nanoset.py
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/althonos/nanoset.py" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falthonos%2Fnanoset.py", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falthonos%2Fnanoset.py'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 65cc8e53644e8ef4602e35eabdd0392b3660fe4d
[INFO] documenting althonos/nanoset.py against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falthonos%2Fnanoset.py" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/althonos/nanoset.py 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 git repo https://github.com/althonos/nanoset.py
[INFO] finished tweaking git repo https://github.com/althonos/nanoset.py
[INFO] tweaked toml for git repo https://github.com/althonos/nanoset.py written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/althonos/nanoset.py 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 2d3568e4c4ee948017620e5ebaa1faaaaecaad1dbdcb1b71e1d7b35f8beaba95
[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" "2d3568e4c4ee948017620e5ebaa1faaaaecaad1dbdcb1b71e1d7b35f8beaba95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d3568e4c4ee948017620e5ebaa1faaaaecaad1dbdcb1b71e1d7b35f8beaba95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d3568e4c4ee948017620e5ebaa1faaaaecaad1dbdcb1b71e1d7b35f8beaba95", kill_on_drop: false }`
[INFO] [stdout] 2d3568e4c4ee948017620e5ebaa1faaaaecaad1dbdcb1b71e1d7b35f8beaba95
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 399c6f73f98a915509e1549609a3f56b5642b722ec3bba716fecc6fa6ced9d49
[INFO] running `Command { std: "docker" "start" "-a" "399c6f73f98a915509e1549609a3f56b5642b722ec3bba716fecc6fa6ced9d49", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling smallvec v1.4.0
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling proc-macro-hack v0.5.16
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling inventory v0.1.6
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]    Compiling pyo3 v0.11.0
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]    Compiling num-traits v0.2.11
[INFO] [stderr]    Compiling unicode-bidi v0.3.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.12
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]    Compiling num-integer v0.1.42
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling url v2.1.1
[INFO] [stderr]    Compiling pyo3-derive-backend v0.11.0
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr]    Compiling paste-impl v0.1.16
[INFO] [stderr]    Compiling inventory-impl v0.1.6
[INFO] [stderr]    Compiling indoc-impl v0.3.5
[INFO] [stderr]    Compiling ctor v0.1.15
[INFO] [stderr]    Compiling ghost v0.1.1
[INFO] [stderr]    Compiling pyo3cls v0.11.0
[INFO] [stderr]     Checking indoc v0.3.5
[INFO] [stderr]     Checking paste v0.1.16
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking cargo-lock v4.0.1
[INFO] [stderr]     Checking built v0.4.2
[INFO] [stderr]     Checking pyo3-built v0.4.2
[INFO] [stderr]    Compiling nanoset-py v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting nanoset-py v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> nanoset/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(doc_cfg, 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 `nanoset-py`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-type rlib --crate-name nanoset_py nanoset/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern pyo3=/opt/rustwide/target/debug/deps/libpyo3-56e1ebae037de114.rmeta --extern pyo3_built=/opt/rustwide/target/debug/deps/libpyo3_built-65582eff265f7ef5.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "399c6f73f98a915509e1549609a3f56b5642b722ec3bba716fecc6fa6ced9d49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "399c6f73f98a915509e1549609a3f56b5642b722ec3bba716fecc6fa6ced9d49", kill_on_drop: false }`
[INFO] [stdout] 399c6f73f98a915509e1549609a3f56b5642b722ec3bba716fecc6fa6ced9d49