[INFO] updating cached repository https://github.com/sd-rust/sprep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d1aa62ed8e25977b64471087f5e2bb21a215128
[INFO] documenting sd-rust/sprep against master#394e1b40d264aa6928811919c1124fa248e7d802 for pr-73566
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsd-rust%2Fsprep" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sd-rust/sprep on toolchain 394e1b40d264aa6928811919c1124fa248e7d802
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sd-rust/sprep
[INFO] finished tweaking git repo https://github.com/sd-rust/sprep
[INFO] tweaked toml for git repo https://github.com/sd-rust/sprep written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/sd-rust/sprep already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+394e1b40d264aa6928811919c1124fa248e7d802" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+394e1b40d264aa6928811919c1124fa248e7d802" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d4dddb6377bc76819ddf273c6374653990c011c1190e31ccc98b2c8264037416
[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" "d4dddb6377bc76819ddf273c6374653990c011c1190e31ccc98b2c8264037416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4dddb6377bc76819ddf273c6374653990c011c1190e31ccc98b2c8264037416", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4dddb6377bc76819ddf273c6374653990c011c1190e31ccc98b2c8264037416", kill_on_drop: false }`
[INFO] [stdout] d4dddb6377bc76819ddf273c6374653990c011c1190e31ccc98b2c8264037416
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "+394e1b40d264aa6928811919c1124fa248e7d802" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 561dd6b1172599e02c1c73d7c081125db53fbd01f187ed7b60fbc2ccbef36e2d
[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" "561dd6b1172599e02c1c73d7c081125db53fbd01f187ed7b60fbc2ccbef36e2d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling serde v1.0.112
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]     Checking array-macro v1.0.5
[INFO] [stderr]     Checking xi-unicode v0.2.0
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]     Checking yaml-rust v0.4.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking crossbeam-channel v0.4.2
[INFO] [stderr]     Checking signal-hook v0.1.15
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking termion v1.5.5
[INFO] [stderr]    Compiling const-random-macro v0.1.8
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking const-random v0.1.8
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking ahash v0.3.8
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling enum-map-derive v0.4.3
[INFO] [stderr]    Compiling serde_derive v1.0.112
[INFO] [stderr]     Checking enum-map v0.6.2
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling enumset_derive v0.5.0
[INFO] [stderr]     Checking enumset v1.0.0
[INFO] [stderr]     Checking cursive_core v0.1.0
[INFO] [stderr]     Checking cursive v0.15.0
[INFO] [stderr]     Checking serde_yaml v0.8.13
[INFO] [stderr]  Documenting spaced_learner v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 58.23s
[INFO] running `Command { std: "docker" "inspect" "561dd6b1172599e02c1c73d7c081125db53fbd01f187ed7b60fbc2ccbef36e2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "561dd6b1172599e02c1c73d7c081125db53fbd01f187ed7b60fbc2ccbef36e2d", kill_on_drop: false }`
[INFO] [stdout] 561dd6b1172599e02c1c73d7c081125db53fbd01f187ed7b60fbc2ccbef36e2d