[INFO] cloning repository https://github.com/joel-simon/threaded_fastaq_ngrams
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/joel-simon/threaded_fastaq_ngrams" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoel-simon%2Fthreaded_fastaq_ngrams", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoel-simon%2Fthreaded_fastaq_ngrams'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7641d92a28637de9ef43de48eee048f0e4863994
[INFO] documenting joel-simon/threaded_fastaq_ngrams against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoel-simon%2Fthreaded_fastaq_ngrams" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/joel-simon/threaded_fastaq_ngrams on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/joel-simon/threaded_fastaq_ngrams
[INFO] finished tweaking git repo https://github.com/joel-simon/threaded_fastaq_ngrams
[INFO] tweaked toml for git repo https://github.com/joel-simon/threaded_fastaq_ngrams written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate git repo https://github.com/joel-simon/threaded_fastaq_ngrams already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d27d1c7cbeeb9f0aadec3c600c861e6c9cc28eba0adea8632e3d3f9b5a6613fa
[INFO] running `Command { std: "docker" "start" "-a" "d27d1c7cbeeb9f0aadec3c600c861e6c9cc28eba0adea8632e3d3f9b5a6613fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d27d1c7cbeeb9f0aadec3c600c861e6c9cc28eba0adea8632e3d3f9b5a6613fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d27d1c7cbeeb9f0aadec3c600c861e6c9cc28eba0adea8632e3d3f9b5a6613fa", kill_on_drop: false }`
[INFO] [stdout] d27d1c7cbeeb9f0aadec3c600c861e6c9cc28eba0adea8632e3d3f9b5a6613fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 537b047284b4eefd73aae9011ededaeea493cee81f256a621b570b8aa2d9920b
[INFO] running `Command { std: "docker" "start" "-a" "537b047284b4eefd73aae9011ededaeea493cee81f256a621b570b8aa2d9920b", kill_on_drop: false }`
[INFO] [stderr]  Documenting concurrent_ngrams v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::old_io`
[INFO] [stdout]  --> src/main.rs:8:10
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::old_io::File;
[INFO] [stdout]   |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::old_io`
[INFO] [stdout]   --> src/main.rs:10:10
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::old_io::BufferedReader;
[INFO] [stdout]    |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]   --> src/main.rs:18:26
[INFO] [stdout]    |
[INFO] [stdout] 18 |   let channels: Vec<_> = ((0..num_threads).map(|i| {
[INFO] [stdout]    |                          ^
[INFO] [stdout] ...
[INFO] [stdout] 21 |   }).collect());
[INFO] [stdout]    |               ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 18 ~   let channels: Vec<_> = (0..num_threads).map(|i| {
[INFO] [stdout] 19 |     let (tx, rx): (Sender<Option<_>>, Receiver<Option<_>>) = channel();
[INFO] [stdout] 20 |     Arc::new((Mutex::new(tx), Mutex::new(rx)))
[INFO] [stdout] 21 ~   }).collect();
[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; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `concurrent_ngrams`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name concurrent_ngrams src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=618aca43487ca807 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 0.0.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "537b047284b4eefd73aae9011ededaeea493cee81f256a621b570b8aa2d9920b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "537b047284b4eefd73aae9011ededaeea493cee81f256a621b570b8aa2d9920b", kill_on_drop: false }`
[INFO] [stdout] 537b047284b4eefd73aae9011ededaeea493cee81f256a621b570b8aa2d9920b