[INFO] cloning repository https://github.com/jonknoxdotcom/polydoku-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jonknoxdotcom/polydoku-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonknoxdotcom%2Fpolydoku-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonknoxdotcom%2Fpolydoku-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] db8656b03261b8ed35d8d76eb26e8e207e9e9849
[INFO] fixing jonknoxdotcom/polydoku-rs against try#622891a4e29178280638a6b63a8908bde2c0c854+cargoflags=-Zfix-edition=start=2015 for pr-157817-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjonknoxdotcom%2Fpolydoku-rs" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jonknoxdotcom/polydoku-rs
[INFO] finished tweaking git repo https://github.com/jonknoxdotcom/polydoku-rs
[INFO] tweaked toml for git repo https://github.com/jonknoxdotcom/polydoku-rs written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jonknoxdotcom/polydoku-rs on toolchain 622891a4e29178280638a6b63a8908bde2c0c854
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jonknoxdotcom/polydoku-rs 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" "+622891a4e29178280638a6b63a8908bde2c0c854" "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-3-tc1/source:/opt/rustwide/workdir:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3
[INFO] running `Command { std: "docker" "start" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=" "-w" "/opt/rustwide/workdir" "--user" "0:0" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "fix" "--allow-no-vcs" "--allow-dirty" "--frozen" "--all" "--all-targets" "--message-format=json" "-Zfix-edition=start=2015", kill_on_drop: false }`
[INFO] [stderr]     Checking colored v3.0.0
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::arch::aarch64`
[INFO] [stdout]   --> src/main.rs:33:11
[INFO] [stdout]    |
[INFO] [stdout] 33 | use std::{arch::aarch64, fmt};
[INFO] [stdout]    |           ^^^^^^-------
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 no `aarch64` in `arch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:288:27
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let mut address = (row * self.states as usize + col);
[INFO] [stdout]     |                           ^                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 288 -         let mut address = (row * self.states as usize + col);
[INFO] [stdout] 288 +         let mut address = row * self.states as usize + col;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:491:31
[INFO] [stdout]     |
[INFO] [stdout] 491 |                     address = (row * n + col);
[INFO] [stdout]     |                               ^             ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 491 -                     address = (row * n + col);
[INFO] [stdout] 491 +                     address = row * n + col;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:763:8
[INFO] [stdout]     |
[INFO] [stdout] 763 |     if (!g.validate()) {
[INFO] [stdout]     |        ^             ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 763 -     if (!g.validate()) {
[INFO] [stdout] 763 +     if !g.validate() {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filename`
[INFO] [stdout]    --> src/main.rs:172:20
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn load(&self, filename: String) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filename`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filename`
[INFO] [stdout]    --> src/main.rs:178:20
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn save(&self, filename: String) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filename`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let mut address = (row * self.states as usize + col);
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:376:13
[INFO] [stdout]     |
[INFO] [stdout] 376 |         let mut added = 0u8;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:550:18
[INFO] [stdout]     |
[INFO] [stdout] 550 |             let  mut memx: usize = 0;   // (x,y) of last free cell
[INFO] [stdout]     |                  ----^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:551:18
[INFO] [stdout]     |
[INFO] [stdout] 551 |             let  mut memy: usize = 0;
[INFO] [stdout]     |                  ----^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `memx`
[INFO] [stdout]    --> src/main.rs:550:18
[INFO] [stdout]     |
[INFO] [stdout] 550 |             let  mut memx: usize = 0;   // (x,y) of last free cell
[INFO] [stdout]     |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_memx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `memy`
[INFO] [stdout]    --> src/main.rs:551:18
[INFO] [stdout]     |
[INFO] [stdout] 551 |             let  mut memy: usize = 0;
[INFO] [stdout]     |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_memy`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `used` is never read
[INFO] [stdout]    --> src/main.rs:467:30
[INFO] [stdout]     |
[INFO] [stdout] 467 |         let mut used:usize = 0;
[INFO] [stdout]     |                              ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 504 |             used = 0;
[INFO] [stdout]     |             -------- `used` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `address` is never read
[INFO] [stdout]    --> src/main.rs:489:35
[INFO] [stdout]     |
[INFO] [stdout] 489 |                 let mut address = 0; // init for compile
[INFO] [stdout]     |                                   ^ this value is reassigned later and never used
[INFO] [stdout] 490 |                 for col in 0..n {
[INFO] [stdout] 491 |                     address = (row * n + col);
[INFO] [stdout]     |                     ------------------------- `address` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `address` is never read
[INFO] [stdout]    --> src/main.rs:524:35
[INFO] [stdout]     |
[INFO] [stdout] 524 |                 let mut address = 0; // init for compile
[INFO] [stdout]     |                                   ^ this value is reassigned later and never used
[INFO] [stdout] 525 |                 for row in 0..n {
[INFO] [stdout] 526 |                     address = row * n + col;
[INFO] [stdout]     |                     ----------------------- `address` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `used` is never read
[INFO] [stdout]    --> src/main.rs:539:30
[INFO] [stdout]     |
[INFO] [stdout] 539 |         let mut used:usize = 0;
[INFO] [stdout]     |                              ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 573 |             used = 0;
[INFO] [stdout]     |             -------- `used` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::arch::aarch64`
[INFO] [stdout]   --> src/main.rs:33:11
[INFO] [stdout]    |
[INFO] [stdout] 33 | use std::{arch::aarch64, fmt};
[INFO] [stdout]    |           ^^^^^^-------
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 no `aarch64` in `arch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row1`
[INFO] [stdout]    --> src/main.rs:677:13
[INFO] [stdout]     |
[INFO] [stdout] 677 |         let row1 = "".to_string(); // possible row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row2`
[INFO] [stdout]    --> src/main.rs:678:13
[INFO] [stdout]     |
[INFO] [stdout] 678 |         let row2 = "".to_string(); // solution row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row3`
[INFO] [stdout]    --> src/main.rs:679:13
[INFO] [stdout]     |
[INFO] [stdout] 679 |         let row3 = "".to_string(); // disallowed row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `demox`
[INFO] [stdout]    --> src/main.rs:719:9
[INFO] [stdout]     |
[INFO] [stdout] 719 |     let demox = vec![
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_demox`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:288:27
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let mut address = (row * self.states as usize + col);
[INFO] [stdout]     |                           ^                                ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 288 -         let mut address = (row * self.states as usize + col);
[INFO] [stdout] 288 +         let mut address = row * self.states as usize + col;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/main.rs:491:31
[INFO] [stdout]     |
[INFO] [stdout] 491 |                     address = (row * n + col);
[INFO] [stdout]     |                               ^             ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 491 -                     address = (row * n + col);
[INFO] [stdout] 491 +                     address = row * n + col;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sudoku` (bin "sudoku") due to 1 previous error; 19 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:763:8
[INFO] [stdout]     |
[INFO] [stdout] 763 |     if (!g.validate()) {
[INFO] [stdout]     |        ^             ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 763 -     if (!g.validate()) {
[INFO] [stdout] 763 +     if !g.validate() {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filename`
[INFO] [stdout]    --> src/main.rs:172:20
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn load(&self, filename: String) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filename`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filename`
[INFO] [stdout]    --> src/main.rs:178:20
[INFO] [stdout]     |
[INFO] [stdout] 178 |     fn save(&self, filename: String) -> bool {
[INFO] [stdout]     |                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_filename`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let mut address = (row * self.states as usize + col);
[INFO] [stdout]     |             ----^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:376:13
[INFO] [stdout]     |
[INFO] [stdout] 376 |         let mut added = 0u8;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:550:18
[INFO] [stdout]     |
[INFO] [stdout] 550 |             let  mut memx: usize = 0;   // (x,y) of last free cell
[INFO] [stdout]     |                  ----^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:551:18
[INFO] [stdout]     |
[INFO] [stdout] 551 |             let  mut memy: usize = 0;
[INFO] [stdout]     |                  ----^^^^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `memx`
[INFO] [stdout]    --> src/main.rs:550:18
[INFO] [stdout]     |
[INFO] [stdout] 550 |             let  mut memx: usize = 0;   // (x,y) of last free cell
[INFO] [stdout]     |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_memx`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `memy`
[INFO] [stdout]    --> src/main.rs:551:18
[INFO] [stdout]     |
[INFO] [stdout] 551 |             let  mut memy: usize = 0;
[INFO] [stdout]     |                  ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_memy`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `used` is never read
[INFO] [stdout]    --> src/main.rs:467:30
[INFO] [stdout]     |
[INFO] [stdout] 467 |         let mut used:usize = 0;
[INFO] [stdout]     |                              ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 504 |             used = 0;
[INFO] [stdout]     |             -------- `used` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `address` is never read
[INFO] [stdout]    --> src/main.rs:489:35
[INFO] [stdout]     |
[INFO] [stdout] 489 |                 let mut address = 0; // init for compile
[INFO] [stdout]     |                                   ^ this value is reassigned later and never used
[INFO] [stdout] 490 |                 for col in 0..n {
[INFO] [stdout] 491 |                     address = (row * n + col);
[INFO] [stdout]     |                     ------------------------- `address` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `address` is never read
[INFO] [stdout]    --> src/main.rs:524:35
[INFO] [stdout]     |
[INFO] [stdout] 524 |                 let mut address = 0; // init for compile
[INFO] [stdout]     |                                   ^ this value is reassigned later and never used
[INFO] [stdout] 525 |                 for row in 0..n {
[INFO] [stdout] 526 |                     address = row * n + col;
[INFO] [stdout]     |                     ----------------------- `address` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `used` is never read
[INFO] [stdout]    --> src/main.rs:539:30
[INFO] [stdout]     |
[INFO] [stdout] 539 |         let mut used:usize = 0;
[INFO] [stdout]     |                              ^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 573 |             used = 0;
[INFO] [stdout]     |             -------- `used` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row1`
[INFO] [stdout]    --> src/main.rs:677:13
[INFO] [stdout]     |
[INFO] [stdout] 677 |         let row1 = "".to_string(); // possible row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row2`
[INFO] [stdout]    --> src/main.rs:678:13
[INFO] [stdout]     |
[INFO] [stdout] 678 |         let row2 = "".to_string(); // solution row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `row3`
[INFO] [stdout]    --> src/main.rs:679:13
[INFO] [stdout]     |
[INFO] [stdout] 679 |         let row3 = "".to_string(); // disallowed row
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_row3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `demox`
[INFO] [stdout]    --> src/main.rs:719:9
[INFO] [stdout]     |
[INFO] [stdout] 719 |     let demox = vec![
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_demox`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sudoku` (bin "sudoku" test) due to 1 previous error; 19 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3", kill_on_drop: false }`
[INFO] [stdout] 11b1c8ca54c2f44650729390b54219997ecd0130268b19d7b213740cddbc5be3
