[INFO] cloning repository https://github.com/grussdorian/sudokount_new
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/grussdorian/sudokount_new" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrussdorian%2Fsudokount_new", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrussdorian%2Fsudokount_new'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d4a44e128f4a89ff703a94488c060b5c07e48829
[INFO] checking grussdorian/sudokount_new against try#2cbf9c3ff35600794d69a7dc7ab399810a067910 for pr-129249-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrussdorian%2Fsudokount_new" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/grussdorian/sudokount_new
[INFO] finished tweaking git repo https://github.com/grussdorian/sudokount_new
[INFO] tweaked toml for git repo https://github.com/grussdorian/sudokount_new written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/grussdorian/sudokount_new on toolchain 2cbf9c3ff35600794d69a7dc7ab399810a067910
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/grussdorian/sudokount_new 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" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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] 8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250
[INFO] running `Command { std: "docker" "start" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250", 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" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250" "/opt/rustwide/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250", 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=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250" "/opt/rustwide/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking sudokount_new v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]  --> src/sudoku.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::BinaryHeap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]  --> src/sudoku.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::BinaryHeap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/sudoku.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |     let mut value = self.get_field(i, j);
[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/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_possibilities`
[INFO] [stdout]    --> src/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_possibilities`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CellPossibilities` is never constructed
[INFO] [stdout]  --> src/sudoku.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CellPossibilities{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `size` and `len` are never read
[INFO] [stdout]   --> src/sudoku.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct SudokuPeers{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 27 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 28 |   len: usize,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/sudoku.rs:77:3
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Sudoku{
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 77 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Sudoku` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/sudoku.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |     let mut value = self.get_field(i, j);
[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/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_possibilities`
[INFO] [stdout]    --> src/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_possibilities`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CellPossibilities` is never constructed
[INFO] [stdout]  --> src/sudoku.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CellPossibilities{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `size` and `len` are never read
[INFO] [stdout]   --> src/sudoku.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct SudokuPeers{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 27 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 28 |   len: usize,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/sudoku.rs:77:3
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Sudoku{
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 77 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Sudoku` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::vec`
[INFO] [stdout]  --> tests/test.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     use std::vec;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]  --> src/sudoku.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::BinaryHeap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `sudokount_new::sudoku`
[INFO] [stdout]  --> tests/test.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use sudokount_new::sudoku;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::BinaryHeap`
[INFO] [stdout]  --> src/sudoku.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::BinaryHeap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `sudoku_peers_5_5` is never read
[INFO] [stdout]   --> tests/test.rs:65:58
[INFO] [stdout]    |
[INFO] [stdout] 65 |         let mut sudoku_peers_5_5: &Vec<(usize, usize)> = &Vec::new();
[INFO] [stdout]    |                                                          ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 68 |            sudoku_peers_5_5 = &sudoku.peers.peers[5][5];
[INFO] [stdout]    |            -------------------------------------------- `sudoku_peers_5_5` 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 `sudoku_peers_5_1` is never read
[INFO] [stdout]   --> tests/test.rs:66:58
[INFO] [stdout]    |
[INFO] [stdout] 66 |         let mut sudoku_peers_5_1: &Vec<(usize, usize)> = &Vec::new();
[INFO] [stdout]    |                                                          ^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 71 |            sudoku_peers_5_1 = &sudoku.peers.peers[5][1];
[INFO] [stdout]    |            -------------------------------------------- `sudoku_peers_5_1` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> tests/test.rs:96:9
[INFO] [stdout]    |
[INFO] [stdout] 96 |         sudoku.eliminate(5, 5, d);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 96 |         let _ = sudoku.eliminate(5, 5, d);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/sudoku.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |     let mut value = self.get_field(i, j);
[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/sudoku.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |     let mut value = self.get_field(i, j);
[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/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_possibilities`
[INFO] [stdout]    --> src/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_possibilities`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_possibilities`
[INFO] [stdout]    --> src/sudoku.rs:223:9
[INFO] [stdout]     |
[INFO] [stdout] 223 |     let mut min_possibilities = usize::MAX;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_possibilities`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `changed`
[INFO] [stdout]  --> src/search.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |       Ok(changed) => {
[INFO] [stdout]   |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_changed`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `changed`
[INFO] [stdout]  --> src/search.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 |       Ok(changed) => {
[INFO] [stdout]   |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_changed`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `changed`
[INFO] [stdout]   --> src/search.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 |             Ok(changed) => {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_changed`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/search.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Err(err) => {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/search.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Err(err) => {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `changed`
[INFO] [stdout]   --> src/search.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 |             Ok(changed) => {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_changed`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/search.rs:26:17
[INFO] [stdout]    |
[INFO] [stdout] 26 |             Err(err) => {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CellPossibilities` is never constructed
[INFO] [stdout]  --> src/sudoku.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CellPossibilities{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `err`
[INFO] [stdout]   --> src/search.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Err(err) => {
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_err`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CellPossibilities` is never constructed
[INFO] [stdout]  --> src/sudoku.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct CellPossibilities{
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `size` and `len` are never read
[INFO] [stdout]   --> src/sudoku.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct SudokuPeers{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 27 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 28 |   len: usize,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/sudoku.rs:77:3
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Sudoku{
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 77 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Sudoku` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `size` and `len` are never read
[INFO] [stdout]   --> src/sudoku.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct SudokuPeers{
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 27 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 28 |   len: usize,
[INFO] [stdout]    |   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `size` is never read
[INFO] [stdout]   --> src/sudoku.rs:77:3
[INFO] [stdout]    |
[INFO] [stdout] 76 | pub struct Sudoku{
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 77 |   size: usize,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Sudoku` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_peers`, `print_peers`, and `print_raw` are never used
[INFO] [stdout]    --> src/sudoku.rs:106:10
[INFO] [stdout]     |
[INFO] [stdout]  87 | impl Sudoku {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 106 |   pub fn get_peers(&self, i: usize, j: usize) -> &Vec<(usize, usize)> {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 118 |   pub fn print_peers(&self) {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |   pub fn print_raw(&self) {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_peers`, `print_peers`, and `print_raw` are never used
[INFO] [stdout]    --> src/sudoku.rs:106:10
[INFO] [stdout]     |
[INFO] [stdout]  87 | impl Sudoku {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 106 |   pub fn get_peers(&self, i: usize, j: usize) -> &Vec<(usize, usize)> {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 118 |   pub fn print_peers(&self) {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |   pub fn print_raw(&self) {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250", kill_on_drop: false }`
[INFO] [stdout] 8ad7ff17bffa56a40b89fd4b66e9404020037644881c06a2cc69fca632910250
