[INFO] fetching crate slam-cv 0.1.3...
[INFO] documenting slam-cv-0.1.3 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate slam-cv 0.1.3 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate slam-cv 0.1.3 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 slam-cv 0.1.3
[INFO] finished tweaking crates.io crate slam-cv 0.1.3
[INFO] tweaked toml for crates.io crate slam-cv 0.1.3 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 75b2b57ba39702459aca58acb33955e45aa3a4ca3629135b697eea81489ddd96
[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" "75b2b57ba39702459aca58acb33955e45aa3a4ca3629135b697eea81489ddd96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75b2b57ba39702459aca58acb33955e45aa3a4ca3629135b697eea81489ddd96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75b2b57ba39702459aca58acb33955e45aa3a4ca3629135b697eea81489ddd96", kill_on_drop: false }`
[INFO] [stdout] 75b2b57ba39702459aca58acb33955e45aa3a4ca3629135b697eea81489ddd96
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] b2a487c928ff0bce0653b9d64ebee31b7042444b65dddbb7deb62c7aa24b163f
[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" "b2a487c928ff0bce0653b9d64ebee31b7042444b65dddbb7deb62c7aa24b163f", kill_on_drop: false }`
[INFO] [stderr]     Checking sample-consensus v0.2.0
[INFO] [stderr]     Checking float-ord v0.2.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]     Checking tiff v0.5.0
[INFO] [stderr]    Compiling derive_more v0.99.9
[INFO] [stderr]     Checking num-integer v0.1.43
[INFO] [stderr]     Checking num-complex v0.2.4
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking num-iter v0.1.41
[INFO] [stderr]     Checking num-rational v0.3.0
[INFO] [stderr]     Checking simba v0.1.5
[INFO] [stderr]     Checking image v0.23.9
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking nalgebra v0.21.1
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking cv-core v0.10.0
[INFO] [stderr]  Documenting slam-cv v0.1.3 (/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(associated_type_defaults)]
[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 `slam-cv`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name slam_cv src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="cv-core"' --cfg 'feature="default"' --cfg 'feature="serde"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-7ea7f32a20d774f4.rmeta --extern cv_core=/opt/rustwide/target/debug/deps/libcv_core-0c31ef702ff7dcfe.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-f5ff7bf5edb125b5.rmeta --extern nalgebra=/opt/rustwide/target/debug/deps/libnalgebra-39122db1e7044245.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-dbd2cef003950858.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-5429dd6d097468fb.rmeta --extern simba=/opt/rustwide/target/debug/deps/libsimba-f6bf3fc8ea31fd0e.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "b2a487c928ff0bce0653b9d64ebee31b7042444b65dddbb7deb62c7aa24b163f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2a487c928ff0bce0653b9d64ebee31b7042444b65dddbb7deb62c7aa24b163f", kill_on_drop: false }`
[INFO] [stdout] b2a487c928ff0bce0653b9d64ebee31b7042444b65dddbb7deb62c7aa24b163f