[INFO] cloning repository https://github.com/nowakf/snakeskin
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nowakf/snakeskin" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnowakf%2Fsnakeskin", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnowakf%2Fsnakeskin'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 15704915fab5cea69a9fa8647dbaa0e09b1435d6
[INFO] checking nowakf/snakeskin against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnowakf%2Fsnakeskin" "/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/nowakf/snakeskin on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nowakf/snakeskin
[INFO] finished tweaking git repo https://github.com/nowakf/snakeskin
[INFO] tweaked toml for git repo https://github.com/nowakf/snakeskin written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/nowakf/snakeskin already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0ebd7980c1f4da843246821d3f28694b6534ba7b4bf4b35d602858b48529aebe
[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" "0ebd7980c1f4da843246821d3f28694b6534ba7b4bf4b35d602858b48529aebe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ebd7980c1f4da843246821d3f28694b6534ba7b4bf4b35d602858b48529aebe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ebd7980c1f4da843246821d3f28694b6534ba7b4bf4b35d602858b48529aebe", kill_on_drop: false }`
[INFO] [stdout] 0ebd7980c1f4da843246821d3f28694b6534ba7b4bf4b35d602858b48529aebe
[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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 29a54ffa127fab9cb77ef2bcf7011d230625f45bd92599bdf6675434604bb303
[INFO] running `Command { std: "docker" "start" "-a" "29a54ffa127fab9cb77ef2bcf7011d230625f45bd92599bdf6675434604bb303", kill_on_drop: false }`
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking png v0.16.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.18
[INFO] [stderr]     Checking image v0.23.2
[INFO] [stderr]     Checking entropy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found keyword `let`
[INFO] [stdout]   --> src/main.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn main() -> Result<()> {Q
[INFO] [stdout]    |                           - expected one of 8 possible tokens
[INFO] [stdout] 87 |     //parse command-line arguments
[INFO] [stdout] 88 |     let args : Vec<String> = std::env::args().collect();
[INFO] [stdout]    |     ^^^ unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found keyword `let`
[INFO] [stdout]   --> src/main.rs:88:5
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn main() -> Result<()> {Q
[INFO] [stdout]    |                           - expected one of 8 possible tokens
[INFO] [stdout] 87 |     //parse command-line arguments
[INFO] [stdout] 88 |     let args : Vec<String> = std::env::args().collect();
[INFO] [stdout]    |     ^^^ unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `entropy`
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "29a54ffa127fab9cb77ef2bcf7011d230625f45bd92599bdf6675434604bb303", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29a54ffa127fab9cb77ef2bcf7011d230625f45bd92599bdf6675434604bb303", kill_on_drop: false }`
[INFO] [stdout] 29a54ffa127fab9cb77ef2bcf7011d230625f45bd92599bdf6675434604bb303