[INFO] fetching crate byte-mutator 0.2.0...
[INFO] documenting byte-mutator-0.2.0 against try#66dfc4e010913fbed0c4ea91fc2c010004b0f441 for pr-73566
[INFO] extracting crate byte-mutator 0.2.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate byte-mutator 0.2.0 on toolchain 66dfc4e010913fbed0c4ea91fc2c010004b0f441
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate byte-mutator 0.2.0
[INFO] finished tweaking crates.io crate byte-mutator 0.2.0
[INFO] tweaked toml for crates.io crate byte-mutator 0.2.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2215bff6f03a20dd64fb103726fea676d0dfc6b95f1f8e24cdec1dc62c54789
[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" "d2215bff6f03a20dd64fb103726fea676d0dfc6b95f1f8e24cdec1dc62c54789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2215bff6f03a20dd64fb103726fea676d0dfc6b95f1f8e24cdec1dc62c54789", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2215bff6f03a20dd64fb103726fea676d0dfc6b95f1f8e24cdec1dc62c54789", kill_on_drop: false }`
[INFO] [stdout] d2215bff6f03a20dd64fb103726fea676d0dfc6b95f1f8e24cdec1dc62c54789
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+66dfc4e010913fbed0c4ea91fc2c010004b0f441" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fad92ed2f7837f23590500b93c847d9cd5b382af7dfc6d029b8350eef98ef52f
[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" "fad92ed2f7837f23590500b93c847d9cd5b382af7dfc6d029b8350eef98ef52f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]  Documenting byte-mutator v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: Rust code block is empty
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |   //! ```
[INFO] [stdout]   |  _____^
[INFO] [stdout] 8 | | //! ```
[INFO] [stdout]   | |_______^
[INFO] [stdout]   |
[INFO] [stdout] help: mark blocks that do not contain Rust code as text
[INFO] [stdout]   |
[INFO] [stdout] 7 | //! ```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 19.28s
[INFO] running `Command { std: "docker" "inspect" "fad92ed2f7837f23590500b93c847d9cd5b382af7dfc6d029b8350eef98ef52f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fad92ed2f7837f23590500b93c847d9cd5b382af7dfc6d029b8350eef98ef52f", kill_on_drop: false }`
[INFO] [stdout] fad92ed2f7837f23590500b93c847d9cd5b382af7dfc6d029b8350eef98ef52f