[INFO] cloning repository https://github.com/Unaidedsteak/rustlings-solutions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Unaidedsteak/rustlings-solutions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnaidedsteak%2Frustlings-solutions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnaidedsteak%2Frustlings-solutions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7723ebac2e7d4cdc5500ee4d74bed410b3c42659
[INFO] documenting Unaidedsteak/rustlings-solutions against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnaidedsteak%2Frustlings-solutions" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/Unaidedsteak/rustlings-solutions on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Unaidedsteak/rustlings-solutions
[INFO] finished tweaking git repo https://github.com/Unaidedsteak/rustlings-solutions
[INFO] tweaked toml for git repo https://github.com/Unaidedsteak/rustlings-solutions written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/Unaidedsteak/rustlings-solutions already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c8a0c941df8e58daa8d6f489795645db9e2d73853d4b9333ac9369396e94841
[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" "2c8a0c941df8e58daa8d6f489795645db9e2d73853d4b9333ac9369396e94841", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c8a0c941df8e58daa8d6f489795645db9e2d73853d4b9333ac9369396e94841", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c8a0c941df8e58daa8d6f489795645db9e2d73853d4b9333ac9369396e94841", kill_on_drop: false }`
[INFO] [stdout] 2c8a0c941df8e58daa8d6f489795645db9e2d73853d4b9333ac9369396e94841
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 308d263c6b04f3680c816661aa1cf37ddf600e835a537a0d9a82066f09875a60
[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" "308d263c6b04f3680c816661aa1cf37ddf600e835a537a0d9a82066f09875a60", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking aho-corasick v0.6.10
[INFO] [stderr]     Checking inotify-sys v0.1.3
[INFO] [stderr]     Checking filetime v0.2.5
[INFO] [stderr]     Checking clicolors-control v0.2.0
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking parking_lot_core v0.5.0
[INFO] [stderr]     Checking mio-extras v2.0.5
[INFO] [stderr]     Checking inotify v0.6.1
[INFO] [stderr]     Checking parking_lot v0.8.0
[INFO] [stderr]     Checking notify v4.0.12
[INFO] [stderr]     Checking console v0.7.5
[INFO] [stderr]     Checking console v0.6.2
[INFO] [stderr]     Checking regex v0.2.11
[INFO] [stderr]     Checking indicatif v0.9.0
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]     Checking serde v1.0.92
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]  Documenting rustlings v1.4.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.66s
[INFO] running `Command { std: "docker" "inspect" "308d263c6b04f3680c816661aa1cf37ddf600e835a537a0d9a82066f09875a60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "308d263c6b04f3680c816661aa1cf37ddf600e835a537a0d9a82066f09875a60", kill_on_drop: false }`
[INFO] [stdout] 308d263c6b04f3680c816661aa1cf37ddf600e835a537a0d9a82066f09875a60