[INFO] cloning repository https://github.com/v1nam/sudoku-solver-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/v1nam/sudoku-solver-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fv1nam%2Fsudoku-solver-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fv1nam%2Fsudoku-solver-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f6c212b46189a96cffe53e6496169380c090a9c
[INFO] checking v1nam/sudoku-solver-rs against master#0a8629bff642c3c3b84bb644c0099194f063b627 for pr-86231
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fv1nam%2Fsudoku-solver-rs" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/v1nam/sudoku-solver-rs on toolchain 0a8629bff642c3c3b84bb644c0099194f063b627
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/v1nam/sudoku-solver-rs
[INFO] finished tweaking git repo https://github.com/v1nam/sudoku-solver-rs
[INFO] tweaked toml for git repo https://github.com/v1nam/sudoku-solver-rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/v1nam/sudoku-solver-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 61906e2bb825ea62a662a1e12fe1e0bcc2bc7d65fa50268025697db2fd255fe1
[INFO] running `Command { std: "docker" "start" "-a" "61906e2bb825ea62a662a1e12fe1e0bcc2bc7d65fa50268025697db2fd255fe1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61906e2bb825ea62a662a1e12fe1e0bcc2bc7d65fa50268025697db2fd255fe1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61906e2bb825ea62a662a1e12fe1e0bcc2bc7d65fa50268025697db2fd255fe1", kill_on_drop: false }`
[INFO] [stdout] 61906e2bb825ea62a662a1e12fe1e0bcc2bc7d65fa50268025697db2fd255fe1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+0a8629bff642c3c3b84bb644c0099194f063b627" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6f344210de85baeec82a206c4b9e8321acef18cec3aac02ed3de1ccb63298a2
[INFO] running `Command { std: "docker" "start" "-a" "a6f344210de85baeec82a206c4b9e8321acef18cec3aac02ed3de1ccb63298a2", kill_on_drop: false }`
[INFO] [stderr]     Checking sudoku_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/tests.rs:53:41
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(backtrack(&mut board2), board2_ans);
[INFO] [stdout]    |                                         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(backtrack(&mut board2), "{}", board2_ans);
[INFO] [stdout]    |                                         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/tests.rs:54:41
[INFO] [stdout]    |
[INFO] [stdout] 54 |         assert!(backtrack(&mut board1), board_1_ans);
[INFO] [stdout]    |                                         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 54 |         assert!(backtrack(&mut board1), "{}", board_1_ans);
[INFO] [stdout]    |                                         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.25s
[INFO] running `Command { std: "docker" "inspect" "a6f344210de85baeec82a206c4b9e8321acef18cec3aac02ed3de1ccb63298a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6f344210de85baeec82a206c4b9e8321acef18cec3aac02ed3de1ccb63298a2", kill_on_drop: false }`
[INFO] [stdout] a6f344210de85baeec82a206c4b9e8321acef18cec3aac02ed3de1ccb63298a2