[INFO] fetching crate ngram 0.1.13...
[INFO] documenting ngram-0.1.13 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate ngram 0.1.13 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate ngram 0.1.13 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ngram 0.1.13
[INFO] finished tweaking crates.io crate ngram 0.1.13
[INFO] tweaked toml for crates.io crate ngram 0.1.13 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f9476742fb4f8fb633377ab720f20d1bb174021e6ba01b44e902dd7170afb4ab
[INFO] running `Command { std: "docker" "start" "-a" "f9476742fb4f8fb633377ab720f20d1bb174021e6ba01b44e902dd7170afb4ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9476742fb4f8fb633377ab720f20d1bb174021e6ba01b44e902dd7170afb4ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9476742fb4f8fb633377ab720f20d1bb174021e6ba01b44e902dd7170afb4ab", kill_on_drop: false }`
[INFO] [stdout] f9476742fb4f8fb633377ab720f20d1bb174021e6ba01b44e902dd7170afb4ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e973b6c4233d279f27169585eda146e4c9d0eb9047245dd2ac075dc37c1cff3b
[INFO] running `Command { std: "docker" "start" "-a" "e973b6c4233d279f27169585eda146e4c9d0eb9047245dd2ac075dc37c1cff3b", kill_on_drop: false }`
[INFO] [stderr]  Documenting ngram v0.1.13 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![feature(test)]
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unclosed HTML tag `T`
[INFO] [stdout]   --> src/lib.rs:24:61
[INFO] [stdout]    |
[INFO] [stdout] 24 | /// Ensure that a condition holds within a Fn(...) -> Option<T>.
[INFO] [stdout]    |                                                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(rustdoc::invalid_html_tags)]` on by default
[INFO] [stdout] help: try marking as source code
[INFO] [stdout]    |
[INFO] [stdout] 24 | /// Ensure that a condition holds within a Fn(...) -> `Option<T>`.
[INFO] [stdout]    |                                                       +         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `ngram`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type lib --crate-name ngram src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=eb21d5603928fa86 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.1.13` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e973b6c4233d279f27169585eda146e4c9d0eb9047245dd2ac075dc37c1cff3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e973b6c4233d279f27169585eda146e4c9d0eb9047245dd2ac075dc37c1cff3b", kill_on_drop: false }`
[INFO] [stdout] e973b6c4233d279f27169585eda146e4c9d0eb9047245dd2ac075dc37c1cff3b
