[INFO] fetching crate gain 0.4.1...
[INFO] documenting gain-0.4.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate gain 0.4.1 into /workspace/builds/worker-48/source
[INFO] validating manifest of crates.io crate gain 0.4.1 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 gain 0.4.1
[INFO] finished tweaking crates.io crate gain 0.4.1
[INFO] tweaked toml for crates.io crate gain 0.4.1 written to /workspace/builds/worker-48/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-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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] 4c636510944b6bb04910c642718f5b930aca2257e3f22d425404fba96e634b30
[INFO] running `Command { std: "docker" "start" "-a" "4c636510944b6bb04910c642718f5b930aca2257e3f22d425404fba96e634b30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c636510944b6bb04910c642718f5b930aca2257e3f22d425404fba96e634b30", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c636510944b6bb04910c642718f5b930aca2257e3f22d425404fba96e634b30", kill_on_drop: false }`
[INFO] [stdout] 4c636510944b6bb04910c642718f5b930aca2257e3f22d425404fba96e634b30
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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] b1b0ff4b1d3a140570203450a1f5a998dc260f030714b3b327e23f1489eac0ae
[INFO] running `Command { std: "docker" "start" "-a" "b1b0ff4b1d3a140570203450a1f5a998dc260f030714b3b327e23f1489eac0ae", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]     Checking async-task v1.3.1
[INFO] [stderr]  Documenting gain v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: Rust code block is empty
[INFO] [stdout]   --> src/task.rs:71:5
[INFO] [stdout]    |
[INFO] [stdout] 71 |   /// ```
[INFO] [stdout]    |  _____^
[INFO] [stdout] 72 | | /// // TODO: T shouldn't require Send trait.
[INFO] [stdout] 73 | | /// ```
[INFO] [stdout]    | |_______^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(rustdoc::invalid_rust_codeblocks)]` on by default
[INFO] [stdout] help: mark blocks that do not contain Rust code as text
[INFO] [stdout]    |
[INFO] [stdout] 71 | /// ```text
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.12s
[INFO] running `Command { std: "docker" "inspect" "b1b0ff4b1d3a140570203450a1f5a998dc260f030714b3b327e23f1489eac0ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1b0ff4b1d3a140570203450a1f5a998dc260f030714b3b327e23f1489eac0ae", kill_on_drop: false }`
[INFO] [stdout] b1b0ff4b1d3a140570203450a1f5a998dc260f030714b3b327e23f1489eac0ae
