[INFO] fetching crate datatest 0.6.3...
[INFO] documenting datatest-0.6.3 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate datatest 0.6.3 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate datatest 0.6.3 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate datatest 0.6.3
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate datatest 0.6.3
[INFO] tweaked toml for crates.io crate datatest 0.6.3 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded datatest-derive v0.6.3
[INFO] [stderr]   Downloaded region v2.2.0
[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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6671b3919b7559a35aa117c149b6ab2b4b7e74ce665c2a8fa6039a989504e2f5
[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" "6671b3919b7559a35aa117c149b6ab2b4b7e74ce665c2a8fa6039a989504e2f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6671b3919b7559a35aa117c149b6ab2b4b7e74ce665c2a8fa6039a989504e2f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6671b3919b7559a35aa117c149b6ab2b4b7e74ce665c2a8fa6039a989504e2f5", kill_on_drop: false }`
[INFO] [stdout] 6671b3919b7559a35aa117c149b6ab2b4b7e74ce665c2a8fa6039a989504e2f5
[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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7556ae6df176a65bca58e9025a0efe13018ee7970889294e1438c2a3432d155
[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" "f7556ae6df176a65bca58e9025a0efe13018ee7970889294e1438c2a3432d155", kill_on_drop: false }`
[INFO] [stderr]    Compiling datatest v0.6.3 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling datatest-derive v0.6.3
[INFO] [stderr]    Compiling ctor v0.1.15
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]  Documenting datatest v0.6.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(termination_trait_lib)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `datatest`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name datatest src/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 ctor=/opt/rustwide/target/debug/deps/libctor-cf5cd5fc12718790.so --extern datatest_derive=/opt/rustwide/target/debug/deps/libdatatest_derive-a4ee67fa1e45ff79.so --extern regex=/opt/rustwide/target/debug/deps/libregex-c251ca4f1be2ef5d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-7f8aeafcf086931c.rmeta --extern serde_yaml=/opt/rustwide/target/debug/deps/libserde_yaml-d3a5e5db28cc8c07.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-37c1eba6428ea4cb.rmeta --extern yaml_rust=/opt/rustwide/target/debug/deps/libyaml_rust-477942c49c77f6fc.rmeta --cap-lints=warn --crate-version 0.6.3` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "f7556ae6df176a65bca58e9025a0efe13018ee7970889294e1438c2a3432d155", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7556ae6df176a65bca58e9025a0efe13018ee7970889294e1438c2a3432d155", kill_on_drop: false }`
[INFO] [stdout] f7556ae6df176a65bca58e9025a0efe13018ee7970889294e1438c2a3432d155