[INFO] fetching crate varianteq 0.5.0...
[INFO] documenting varianteq-0.5.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate varianteq 0.5.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate varianteq 0.5.0 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 varianteq 0.5.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate varianteq 0.5.0
[INFO] tweaked toml for crates.io crate varianteq 0.5.0 written to /workspace/builds/worker-1/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] b2621a5671763f26437c20712be99981285407a1580fdb0c9af2630f71e809a9
[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" "b2621a5671763f26437c20712be99981285407a1580fdb0c9af2630f71e809a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2621a5671763f26437c20712be99981285407a1580fdb0c9af2630f71e809a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2621a5671763f26437c20712be99981285407a1580fdb0c9af2630f71e809a9", kill_on_drop: false }`
[INFO] [stdout] b2621a5671763f26437c20712be99981285407a1580fdb0c9af2630f71e809a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 561e8feafef609a3c6eae2eb4bcc0958c0d250ceb2c285c925f4ba9235858273
[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" "561e8feafef609a3c6eae2eb4bcc0958c0d250ceb2c285c925f4ba9235858273", kill_on_drop: false }`
[INFO] [stderr]  Documenting varianteq v0.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | #![feature(proc_macro_diagnostic)]
[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 `varianteq`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type proc-macro --crate-name varianteq 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 proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-e2b55f3fa9b89984.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-252ac74022158045.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-bf2f18ab3e75d3bc.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.5.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "561e8feafef609a3c6eae2eb4bcc0958c0d250ceb2c285c925f4ba9235858273", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "561e8feafef609a3c6eae2eb4bcc0958c0d250ceb2c285c925f4ba9235858273", kill_on_drop: false }`
[INFO] [stdout] 561e8feafef609a3c6eae2eb4bcc0958c0d250ceb2c285c925f4ba9235858273