[INFO] cloning repository https://github.com/helmutschneider/sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/helmutschneider/sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelmutschneider%2Fsudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelmutschneider%2Fsudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 222ed1ee53c369d2c9e3e9adf949892041d483a0
[INFO] checking helmutschneider/sudoku against try#218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa for pr-92594
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhelmutschneider%2Fsudoku" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/helmutschneider/sudoku on toolchain 218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/helmutschneider/sudoku
[INFO] finished tweaking git repo https://github.com/helmutschneider/sudoku
[INFO] tweaked toml for git repo https://github.com/helmutschneider/sudoku written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/helmutschneider/sudoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1fe73c6d1104b712c614a1b41dbae64185537d9bee57ad826e0b7417e66c0612
[INFO] running `Command { std: "docker" "start" "-a" "1fe73c6d1104b712c614a1b41dbae64185537d9bee57ad826e0b7417e66c0612", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1fe73c6d1104b712c614a1b41dbae64185537d9bee57ad826e0b7417e66c0612", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fe73c6d1104b712c614a1b41dbae64185537d9bee57ad826e0b7417e66c0612", kill_on_drop: false }`
[INFO] [stdout] 1fe73c6d1104b712c614a1b41dbae64185537d9bee57ad826e0b7417e66c0612
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+218e3b1b9f68e7a8b7fb8fcbff627c64536eebaa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4d3acf699d3177e70b7c742dc031507606e5532cf479ebeb1cb0b60d366a7bf4
[INFO] running `Command { std: "docker" "start" "-a" "4d3acf699d3177e70b7c742dc031507606e5532cf479ebeb1cb0b60d366a7bf4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/board.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::digit::Digit`
[INFO] [stdout]  --> src/index.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::digit::Digit;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `CellIndex`, `ColumnIndex`, `RowIndex`
[INFO] [stdout]  --> src/solver.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::index::{CellIndex, ColumnIndex, RowIndex};
[INFO] [stdout]   |                    ^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/board.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4m 21s
[INFO] running `Command { std: "docker" "inspect" "4d3acf699d3177e70b7c742dc031507606e5532cf479ebeb1cb0b60d366a7bf4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d3acf699d3177e70b7c742dc031507606e5532cf479ebeb1cb0b60d366a7bf4", kill_on_drop: false }`
[INFO] [stdout] 4d3acf699d3177e70b7c742dc031507606e5532cf479ebeb1cb0b60d366a7bf4