[INFO] fetching crate ruby-parser 0.0.0-dev1...
[INFO] documenting ruby-parser-0.0.0-dev1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate ruby-parser 0.0.0-dev1 into /workspace/builds/worker-37/source
[INFO] validating manifest of crates.io crate ruby-parser 0.0.0-dev1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ruby-parser 0.0.0-dev1
[INFO] finished tweaking crates.io crate ruby-parser 0.0.0-dev1
[INFO] tweaked toml for crates.io crate ruby-parser 0.0.0-dev1 written to /workspace/builds/worker-37/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b60e5106182b3532dce3c9ce40d4330c4845776e3d4c0a732a4abbc41733f229
[INFO] running `Command { std: "docker" "start" "-a" "b60e5106182b3532dce3c9ce40d4330c4845776e3d4c0a732a4abbc41733f229", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b60e5106182b3532dce3c9ce40d4330c4845776e3d4c0a732a4abbc41733f229", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b60e5106182b3532dce3c9ce40d4330c4845776e3d4c0a732a4abbc41733f229", kill_on_drop: false }`
[INFO] [stdout] b60e5106182b3532dce3c9ce40d4330c4845776e3d4c0a732a4abbc41733f229
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a07fb533115e8229b07f7159ab996a55a678f11fa106ec8839a98d92e986666
[INFO] running `Command { std: "docker" "start" "-a" "2a07fb533115e8229b07f7159ab996a55a678f11fa106ec8839a98d92e986666", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking codemap v0.1.3
[INFO] [stderr]    Compiling nom v6.1.2
[INFO] [stderr]  Documenting ruby-parser v0.0.0-dev1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0053]: method `slice_index` has an incompatible type for trait
[INFO] [stdout]    --> src/structs/tracked_location.rs:235:44
[INFO] [stdout]     |
[INFO] [stdout] 235 |     fn slice_index(&self, count: usize) -> Option<usize> {
[INFO] [stdout]     |                                            ^^^^^^^^^^^^^
[INFO] [stdout]     |                                            |
[INFO] [stdout]     |                                            expected enum `std::result::Result`, found enum `std::option::Option`
[INFO] [stdout]     |                                            help: change the output type to match the trait: `std::result::Result<usize, nom::Needed>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected fn pointer `fn(&structs::tracked_location::TrackedLocation<&'a str, X>, _) -> std::result::Result<usize, nom::Needed>`
[INFO] [stdout]                found fn pointer `fn(&structs::tracked_location::TrackedLocation<&'a str, X>, _) -> std::option::Option<usize>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `ruby-parser`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name ruby_parser 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 codemap=/opt/rustwide/target/debug/deps/libcodemap-681e797f5f3a764d.rmeta --extern memchr=/opt/rustwide/target/debug/deps/libmemchr-865cad8e691f1123.rmeta --extern nom=/opt/rustwide/target/debug/deps/libnom-700d891af2cfae21.rmeta --cap-lints=warn --crate-version 0.0.0-dev1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2a07fb533115e8229b07f7159ab996a55a678f11fa106ec8839a98d92e986666", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a07fb533115e8229b07f7159ab996a55a678f11fa106ec8839a98d92e986666", kill_on_drop: false }`
[INFO] [stdout] 2a07fb533115e8229b07f7159ab996a55a678f11fa106ec8839a98d92e986666
