[INFO] fetching crate rexsgdata 0.9.7...
[INFO] documenting rexsgdata-0.9.7 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate rexsgdata 0.9.7 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rexsgdata 0.9.7 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 rexsgdata 0.9.7
[INFO] finished tweaking crates.io crate rexsgdata 0.9.7
[INFO] tweaked toml for crates.io crate rexsgdata 0.9.7 written to /workspace/builds/worker-4/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 semver v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] ba47c4bac68d85334872d9ae3f27b083ab81fc8fff36e980cc60da41f1ab2de7
[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" "ba47c4bac68d85334872d9ae3f27b083ab81fc8fff36e980cc60da41f1ab2de7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba47c4bac68d85334872d9ae3f27b083ab81fc8fff36e980cc60da41f1ab2de7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba47c4bac68d85334872d9ae3f27b083ab81fc8fff36e980cc60da41f1ab2de7", kill_on_drop: false }`
[INFO] [stdout] ba47c4bac68d85334872d9ae3f27b083ab81fc8fff36e980cc60da41f1ab2de7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 038242e1fe23e52ad43dd359dcddd46fce9b9bb28ae50d0af2004492a4e8f04e
[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" "038242e1fe23e52ad43dd359dcddd46fce9b9bb28ae50d0af2004492a4e8f04e", 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] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking itertools v0.9.0
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking semver v0.10.0
[INFO] [stderr]  Documenting rexsgdata v0.9.7 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:19:1
[INFO] [stdout]    |
[INFO] [stdout] 19 | #![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:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![feature(const_if_match)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `rexsgdata`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name rexsgdata 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 itertools=/opt/rustwide/target/debug/deps/libitertools-389af87ce6697360.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-b01e5f49cd1b74e8.rmeta --extern semver=/opt/rustwide/target/debug/deps/libsemver-f5f24d68d1af3282.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-570daa8b5fc9252f.rmeta --extern serde_bytes=/opt/rustwide/target/debug/deps/libserde_bytes-8906635d21ab3635.rmeta --extern slog=/opt/rustwide/target/debug/deps/libslog-e72c3bd4498bdb8c.rmeta --extern smallvec=/opt/rustwide/target/debug/deps/libsmallvec-cc94e5a717740873.rmeta --cap-lints=warn --crate-version 0.9.7` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "038242e1fe23e52ad43dd359dcddd46fce9b9bb28ae50d0af2004492a4e8f04e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "038242e1fe23e52ad43dd359dcddd46fce9b9bb28ae50d0af2004492a4e8f04e", kill_on_drop: false }`
[INFO] [stdout] 038242e1fe23e52ad43dd359dcddd46fce9b9bb28ae50d0af2004492a4e8f04e