[INFO] fetching crate zekin_data_structure 1.0.0...
[INFO] documenting zekin_data_structure-1.0.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate zekin_data_structure 1.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate zekin_data_structure 1.0.0 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 zekin_data_structure 1.0.0
[INFO] finished tweaking crates.io crate zekin_data_structure 1.0.0
[INFO] tweaked toml for crates.io crate zekin_data_structure 1.0.0 written to /workspace/builds/worker-6/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] aa4cbad489178e8fa1d8c01aa29ba0d1d5fa12adfd2ef919d3b9d7415d961d93
[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" "aa4cbad489178e8fa1d8c01aa29ba0d1d5fa12adfd2ef919d3b9d7415d961d93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aa4cbad489178e8fa1d8c01aa29ba0d1d5fa12adfd2ef919d3b9d7415d961d93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa4cbad489178e8fa1d8c01aa29ba0d1d5fa12adfd2ef919d3b9d7415d961d93", kill_on_drop: false }`
[INFO] [stdout] aa4cbad489178e8fa1d8c01aa29ba0d1d5fa12adfd2ef919d3b9d7415d961d93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 3fc19cb8bc74b883defed43123cff051daba8f8628fb504d921d29c1fa3bc685
[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" "3fc19cb8bc74b883defed43123cff051daba8f8628fb504d921d29c1fa3bc685", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen v0.2.68
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.3.18
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]    Compiling getset v0.1.1
[INFO] [stderr]     Checking js-sys v0.3.45
[INFO] [stderr]     Checking console_error_panic_hook v0.1.6
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.18
[INFO] [stderr]     Checking wasm-bindgen-test v0.3.18
[INFO] [stderr]  Documenting zekin_data_structure v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(get_mut_unchecked)]
[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 `zekin_data_structure`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-type rlib --crate-name zekin_data_structure 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 float_cmp=/opt/rustwide/target/debug/deps/libfloat_cmp-80b901b6d2e743a0.rmeta --extern getset=/opt/rustwide/target/debug/deps/libgetset-3461e570c2bd0bb9.so --extern itertools=/opt/rustwide/target/debug/deps/libitertools-06e4219b5ed9c5cf.rmeta --extern js_sys=/opt/rustwide/target/debug/deps/libjs_sys-c63f6be04dbd186f.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7a48be7d7c854e7f.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-1a80678796def7c7.rmeta --extern wasm_bindgen=/opt/rustwide/target/debug/deps/libwasm_bindgen-6f9acc6494ae190d.rmeta --extern wasm_bindgen_test=/opt/rustwide/target/debug/deps/libwasm_bindgen_test-361d802c69ce82d5.rmeta --cap-lints=warn --crate-version 1.0.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "3fc19cb8bc74b883defed43123cff051daba8f8628fb504d921d29c1fa3bc685", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fc19cb8bc74b883defed43123cff051daba8f8628fb504d921d29c1fa3bc685", kill_on_drop: false }`
[INFO] [stdout] 3fc19cb8bc74b883defed43123cff051daba8f8628fb504d921d29c1fa3bc685
