[INFO] cloning repository https://github.com/khoda81/sudoku-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/khoda81/sudoku-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhoda81%2Fsudoku-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhoda81%2Fsudoku-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 962092ba296d8d8c44b7c017e7768bcc010c5371
[INFO] checking khoda81/sudoku-solver against try#fafe42c59556a4233f03dd0d900b575a9afeece8 for pr-143764
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkhoda81%2Fsudoku-solver" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/khoda81/sudoku-solver
[INFO] finished tweaking git repo https://github.com/khoda81/sudoku-solver
[INFO] tweaked toml for git repo https://github.com/khoda81/sudoku-solver written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/khoda81/sudoku-solver on toolchain fafe42c59556a4233f03dd0d900b575a9afeece8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/khoda81/sudoku-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7c3457d738c8414ba2797556d1dd652a349f3336987573201f86f07d6751cb17
[INFO] running `Command { std: "docker" "start" "-a" "7c3457d738c8414ba2797556d1dd652a349f3336987573201f86f07d6751cb17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7c3457d738c8414ba2797556d1dd652a349f3336987573201f86f07d6751cb17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c3457d738c8414ba2797556d1dd652a349f3336987573201f86f07d6751cb17", kill_on_drop: false }`
[INFO] [stdout] 7c3457d738c8414ba2797556d1dd652a349f3336987573201f86f07d6751cb17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+fafe42c59556a4233f03dd0d900b575a9afeece8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1cc19c87be119c0e28c3231e2d9a77e046ed34959a5ddf3b6b3b1277249b7eeb
[INFO] running `Command { std: "docker" "start" "-a" "1cc19c87be119c0e28c3231e2d9a77e046ed34959a5ddf3b6b3b1277249b7eeb", kill_on_drop: false }`
[INFO] [stderr]     Checking sudoku_solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `io::Write`
[INFO] [stdout]  --> src/binary_sudoku.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, io::Write};
[INFO] [stdout]   |                         ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `io::Write`
[INFO] [stdout]  --> src/binary_sudoku.rs:1:25
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{fmt::Display, io::Write};
[INFO] [stdout]   |                         ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_options`
[INFO] [stdout]    --> src/binary_sudoku.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |         let num_options = self.masks[i][j].count_ones();
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_options`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_options`
[INFO] [stdout]    --> src/binary_sudoku.rs:130:13
[INFO] [stdout]     |
[INFO] [stdout] 130 |         let num_options = self.masks[i][j].count_ones();
[INFO] [stdout]     |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_options`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration`, `fmt::Display`, and `self`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fmt::Display,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 3 |     time::{self, Duration, Instant},
[INFO] [stdout]   |            ^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IntegerSudoku`
[INFO] [stdout]  --> src/main.rs:6:35
[INFO] [stdout]   |
[INFO] [stdout] 6 | use sudoku_solver::{BinarySudoku, IntegerSudoku, SudokuSolver};
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration`, `fmt::Display`, and `self`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     fmt::Display,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 3 |     time::{self, Duration, Instant},
[INFO] [stdout]   |            ^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `IntegerSudoku`
[INFO] [stdout]  --> src/main.rs:6:35
[INFO] [stdout]   |
[INFO] [stdout] 6 | use sudoku_solver::{BinarySudoku, IntegerSudoku, SudokuSolver};
[INFO] [stdout]   |                                   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "1cc19c87be119c0e28c3231e2d9a77e046ed34959a5ddf3b6b3b1277249b7eeb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1cc19c87be119c0e28c3231e2d9a77e046ed34959a5ddf3b6b3b1277249b7eeb", kill_on_drop: false }`
[INFO] [stdout] 1cc19c87be119c0e28c3231e2d9a77e046ed34959a5ddf3b6b3b1277249b7eeb