[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 beta-2020-08-29 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-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] [stderr] Checking out files:  39% (541/1367)   
Checking out files:  40% (547/1367)   
Checking out files:  41% (561/1367)   
Checking out files:  42% (575/1367)   
Checking out files:  43% (588/1367)   
Checking out files:  44% (602/1367)   
Checking out files:  45% (616/1367)   
Checking out files:  46% (629/1367)   
Checking out files:  47% (643/1367)   
Checking out files:  48% (657/1367)   
Checking out files:  49% (670/1367)   
Checking out files:  50% (684/1367)   
Checking out files:  51% (698/1367)   
Checking out files:  52% (711/1367)   
Checking out files:  53% (725/1367)   
Checking out files:  54% (739/1367)   
Checking out files:  55% (752/1367)   
Checking out files:  56% (766/1367)   
Checking out files:  57% (780/1367)   
Checking out files:  58% (793/1367)   
Checking out files:  59% (807/1367)   
Checking out files:  60% (821/1367)   
Checking out files:  61% (834/1367)   
Checking out files:  62% (848/1367)   
Checking out files:  63% (862/1367)   
Checking out files:  64% (875/1367)   
Checking out files:  65% (889/1367)   
Checking out files:  66% (903/1367)   
Checking out files:  67% (916/1367)   
Checking out files:  68% (930/1367)   
Checking out files:  69% (944/1367)   
Checking out files:  70% (957/1367)   
Checking out files:  71% (971/1367)   
Checking out files:  72% (985/1367)   
Checking out files:  73% (998/1367)   
Checking out files:  74% (1012/1367)   
Checking out files:  75% (1026/1367)   
Checking out files:  76% (1039/1367)   
Checking out files:  77% (1053/1367)   
Checking out files:  77% (1057/1367)   
Checking out files:  78% (1067/1367)   
Checking out files:  79% (1080/1367)   
Checking out files:  80% (1094/1367)   
Checking out files:  81% (1108/1367)   
Checking out files:  82% (1121/1367)   
Checking out files:  83% (1135/1367)   
Checking out files:  84% (1149/1367)   
Checking out files:  85% (1162/1367)   
Checking out files:  86% (1176/1367)   
Checking out files:  87% (1190/1367)   
Checking out files:  88% (1203/1367)   
Checking out files:  89% (1217/1367)   
Checking out files:  90% (1231/1367)   
Checking out files:  91% (1244/1367)   
Checking out files:  92% (1258/1367)   
Checking out files:  93% (1272/1367)   
Checking out files:  94% (1285/1367)   
Checking out files:  95% (1299/1367)   
Checking out files:  96% (1313/1367)   
Checking out files:  97% (1326/1367)   
Checking out files:  98% (1340/1367)   
Checking out files:  99% (1354/1367)   
Checking out files: 100% (1367/1367)   
Checking out files: 100% (1367/1367), done.
[INFO] validating manifest of git repo https://github.com/Unaidedsteak/rustlings-solutions on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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-8/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded console v0.6.2
[INFO] [stderr]   Downloaded assert_cmd v0.11.1
[INFO] [stderr]   Downloaded clicolors-control v0.2.0
[INFO] [stderr]   Downloaded escargot v0.4.0
[INFO] [stderr]   Downloaded syn v0.15.34
[INFO] [stderr]   Downloaded console v0.7.5
[INFO] [stderr]   Downloaded indicatif v0.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2249d09daa87ee27a9146e8c3d9e700eb1f68f802fea4c48b691a914eb8f2642
[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" "2249d09daa87ee27a9146e8c3d9e700eb1f68f802fea4c48b691a914eb8f2642", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2249d09daa87ee27a9146e8c3d9e700eb1f68f802fea4c48b691a914eb8f2642", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2249d09daa87ee27a9146e8c3d9e700eb1f68f802fea4c48b691a914eb8f2642", kill_on_drop: false }`
[INFO] [stdout] 2249d09daa87ee27a9146e8c3d9e700eb1f68f802fea4c48b691a914eb8f2642
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 18d0e6d4ce1014eb09d6dae74e9d2e5a27d13be791089384879d60238fe1bedc
[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" "18d0e6d4ce1014eb09d6dae74e9d2e5a27d13be791089384879d60238fe1bedc", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking termios v0.3.1
[INFO] [stderr]     Checking inotify-sys v0.1.3
[INFO] [stderr]     Checking clicolors-control v1.0.0
[INFO] [stderr]     Checking clicolors-control v0.2.0
[INFO] [stderr]     Checking filetime v0.2.5
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking regex v1.1.6
[INFO] [stderr]     Checking inotify v0.6.1
[INFO] [stderr]     Checking mio v0.6.19
[INFO] [stderr]     Checking mio-extras v2.0.5
[INFO] [stderr]     Checking parking_lot_core v0.5.0
[INFO] [stderr]     Checking notify v4.0.12
[INFO] [stderr]     Checking parking_lot v0.8.0
[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 33.85s
[INFO] running `Command { std: "docker" "inspect" "18d0e6d4ce1014eb09d6dae74e9d2e5a27d13be791089384879d60238fe1bedc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18d0e6d4ce1014eb09d6dae74e9d2e5a27d13be791089384879d60238fe1bedc", kill_on_drop: false }`
[INFO] [stdout] 18d0e6d4ce1014eb09d6dae74e9d2e5a27d13be791089384879d60238fe1bedc