[INFO] cloning repository https://github.com/rjyo/rustlings_answers
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rjyo/rustlings_answers" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frjyo%2Frustlings_answers", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frjyo%2Frustlings_answers'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ea9b707d5c58334cc191f5789ce4c27707a71cb2
[INFO] checking rjyo/rustlings_answers against master#6526e5c772f2da07db745c94ca6bb0a591a39ba4 for pr-80920
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frjyo%2Frustlings_answers" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rjyo/rustlings_answers on toolchain 6526e5c772f2da07db745c94ca6bb0a591a39ba4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rjyo/rustlings_answers
[INFO] finished tweaking git repo https://github.com/rjyo/rustlings_answers
[INFO] tweaked toml for git repo https://github.com/rjyo/rustlings_answers written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/rjyo/rustlings_answers already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ef3c3a7e4991f92dbb5acdfeceb975c71e3eb36abd65652b2fcd0aabaac809af
[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" "ef3c3a7e4991f92dbb5acdfeceb975c71e3eb36abd65652b2fcd0aabaac809af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ef3c3a7e4991f92dbb5acdfeceb975c71e3eb36abd65652b2fcd0aabaac809af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ef3c3a7e4991f92dbb5acdfeceb975c71e3eb36abd65652b2fcd0aabaac809af", kill_on_drop: false }`
[INFO] [stdout] ef3c3a7e4991f92dbb5acdfeceb975c71e3eb36abd65652b2fcd0aabaac809af
[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" "RUSTFLAGS=--cap-lints=forbid" "-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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b3d54ab0b074d93ee3bbdb57488d9f6c593c9e3e395261478146444f9f616dd
[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" "0b3d54ab0b074d93ee3bbdb57488d9f6c593c9e3e395261478146444f9f616dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling syn v1.0.55
[INFO] [stderr]    Compiling serde_json v1.0.60
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking predicates-core v1.0.0
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking inotify-sys v0.1.4
[INFO] [stderr]     Checking terminal_size v0.1.15
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clicolors-control v1.0.1
[INFO] [stderr]     Checking filetime v0.2.13
[INFO] [stderr]     Checking termios v0.3.3
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking parking_lot_core v0.8.1
[INFO] [stderr]     Checking predicates-tree v1.0.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking inotify v0.7.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking console v0.13.0
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking console v0.7.7
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]     Checking notify v4.0.15
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking number_prefix v0.2.8
[INFO] [stderr]     Checking indicatif v0.10.3
[INFO] [stderr]     Checking predicates v1.0.5
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]     Checking serde v1.0.118
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]     Checking rustlings v4.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 48.25s
[INFO] running `Command { std: "docker" "inspect" "0b3d54ab0b074d93ee3bbdb57488d9f6c593c9e3e395261478146444f9f616dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b3d54ab0b074d93ee3bbdb57488d9f6c593c9e3e395261478146444f9f616dd", kill_on_drop: false }`
[INFO] [stdout] 0b3d54ab0b074d93ee3bbdb57488d9f6c593c9e3e395261478146444f9f616dd