[INFO] fetching crate asciimath-rs 0.5.6...
[INFO] documenting asciimath-rs-0.5.6 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate asciimath-rs 0.5.6 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate asciimath-rs 0.5.6 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 asciimath-rs 0.5.6
[INFO] finished tweaking crates.io crate asciimath-rs 0.5.6
[INFO] tweaked toml for crates.io crate asciimath-rs 0.5.6 written to /workspace/builds/worker-14/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 3cfb9883027bbb54ffec8a6c53220f957e987bdd8ab2f96c3f6d906095b92462
[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" "3cfb9883027bbb54ffec8a6c53220f957e987bdd8ab2f96c3f6d906095b92462", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3cfb9883027bbb54ffec8a6c53220f957e987bdd8ab2f96c3f6d906095b92462", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cfb9883027bbb54ffec8a6c53220f957e987bdd8ab2f96c3f6d906095b92462", kill_on_drop: false }`
[INFO] [stdout] 3cfb9883027bbb54ffec8a6c53220f957e987bdd8ab2f96c3f6d906095b92462
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] 9eda189e76ee9bdbb4652b7982cb1c805f4bfdf97524d66c8eb19eccddf2d00d
[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" "9eda189e76ee9bdbb4652b7982cb1c805f4bfdf97524d66c8eb19eccddf2d00d", 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]     Checking htmlescape v0.3.1
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]     Checking charred v0.3.3
[INFO] [stderr]  Documenting asciimath-rs v0.5.6 (/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(test)]
[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 `asciimath-rs`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name asciimath_rs 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 charred=/opt/rustwide/target/debug/deps/libcharred-c115cd16e6393920.rmeta --extern htmlescape=/opt/rustwide/target/debug/deps/libhtmlescape-7823cb60bce78bf1.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-57a7edc7f441d44c.rmeta --extern maplit=/opt/rustwide/target/debug/deps/libmaplit-dd637e51935b99fa.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "9eda189e76ee9bdbb4652b7982cb1c805f4bfdf97524d66c8eb19eccddf2d00d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eda189e76ee9bdbb4652b7982cb1c805f4bfdf97524d66c8eb19eccddf2d00d", kill_on_drop: false }`
[INFO] [stdout] 9eda189e76ee9bdbb4652b7982cb1c805f4bfdf97524d66c8eb19eccddf2d00d