[INFO] cloning repository https://github.com/mutexlox/minesweeper
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mutexlox/minesweeper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmutexlox%2Fminesweeper", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmutexlox%2Fminesweeper'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0ca1b5c7594dd65918ede2c7c0cd3f153df17344
[INFO] checking mutexlox/minesweeper against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmutexlox%2Fminesweeper" "/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/mutexlox/minesweeper on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mutexlox/minesweeper
[INFO] finished tweaking git repo https://github.com/mutexlox/minesweeper
[INFO] tweaked toml for git repo https://github.com/mutexlox/minesweeper written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/mutexlox/minesweeper already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 357edf1e4747b95a1dd494deeadef8815ebb29891d57e270fa8e22b334340d0a
[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" "357edf1e4747b95a1dd494deeadef8815ebb29891d57e270fa8e22b334340d0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "357edf1e4747b95a1dd494deeadef8815ebb29891d57e270fa8e22b334340d0a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "357edf1e4747b95a1dd494deeadef8815ebb29891d57e270fa8e22b334340d0a", kill_on_drop: false }`
[INFO] [stdout] 357edf1e4747b95a1dd494deeadef8815ebb29891d57e270fa8e22b334340d0a
[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" "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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62a389351772f1f58d5da6db740498cd61c81a07c25d6382eecbfaf518ab330a
[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" "62a389351772f1f58d5da6db740498cd61c81a07c25d6382eecbfaf518ab330a", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.18
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking minesweeper_backend v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `backend`
[INFO] [stdout]  --> src/lib.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 |     use ::backend::Game;
[INFO] [stdout]   |           ^^^^^^^ help: a similar path exists: `crate::backend`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `use` statements changed in Rust 2018; read more at <https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `board_iter`
[INFO] [stdout]  --> src/lib.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use ::board_iter::board_iter;
[INFO] [stdout]   |           ^^^^^^^^^^ help: a similar path exists: `crate::board_iter`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `use` statements changed in Rust 2018; read more at <https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `minesweeper_backend`.
[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" "62a389351772f1f58d5da6db740498cd61c81a07c25d6382eecbfaf518ab330a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62a389351772f1f58d5da6db740498cd61c81a07c25d6382eecbfaf518ab330a", kill_on_drop: false }`
[INFO] [stdout] 62a389351772f1f58d5da6db740498cd61c81a07c25d6382eecbfaf518ab330a