Nov 28 13:42:04.274 INFO checking EthanTheMaster/sudoku_solver against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 13:42:04.276 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-3/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 28 13:42:04.832 INFO [stdout] 504ca8462c8d975b764d92ae6e9741819f20b49ef0518bb444579530d855781f
Nov 28 13:42:04.834 INFO running `"docker" "start" "-a" "504ca8462c8d975b764d92ae6e9741819f20b49ef0518bb444579530d855781f"`
Nov 28 13:42:06.600 INFO [stderr] usermod: no changes
Nov 28 13:42:06.643 INFO [stderr]     Checking sudoku_solver v0.1.0 (/source)
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `operation`
Nov 28 13:42:07.548 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Nov 28 13:42:07.548 INFO [stderr]    |
Nov 28 13:42:07.548 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Nov 28 13:42:07.548 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Nov 28 13:42:07.548 INFO [stderr]    |
Nov 28 13:42:07.548 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 28 13:42:07.548 INFO [stderr] 
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.548 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Nov 28 13:42:07.548 INFO [stderr]     |
Nov 28 13:42:07.548 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Nov 28 13:42:07.548 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.548 INFO [stderr] 
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `operation`
Nov 28 13:42:07.548 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Nov 28 13:42:07.548 INFO [stderr]     |
Nov 28 13:42:07.548 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Nov 28 13:42:07.548 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Nov 28 13:42:07.548 INFO [stderr] 
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.548 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Nov 28 13:42:07.548 INFO [stderr]     |
Nov 28 13:42:07.548 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Nov 28 13:42:07.548 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.548 INFO [stderr] 
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.548 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Nov 28 13:42:07.548 INFO [stderr]     |
Nov 28 13:42:07.548 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 28 13:42:07.548 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.548 INFO [stderr] 
Nov 28 13:42:07.548 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.549 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Nov 28 13:42:07.549 INFO [stderr]     |
Nov 28 13:42:07.549 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 28 13:42:07.549 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.549 INFO [stderr] 
Nov 28 13:42:07.549 INFO [stderr] warning: unused variable: `idx`
Nov 28 13:42:07.549 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Nov 28 13:42:07.549 INFO [stderr]    |
Nov 28 13:42:07.549 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Nov 28 13:42:07.549 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Nov 28 13:42:07.549 INFO [stderr] 
Nov 28 13:42:07.549 INFO [stderr] warning: unused variable: `val`
Nov 28 13:42:07.549 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Nov 28 13:42:07.549 INFO [stderr]    |
Nov 28 13:42:07.549 INFO [stderr] 37 |             }).map(|(idx, val)| {
Nov 28 13:42:07.549 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Nov 28 13:42:07.549 INFO [stderr] 
Nov 28 13:42:07.604 INFO [stderr] warning: unused variable: `operation`
Nov 28 13:42:07.604 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Nov 28 13:42:07.604 INFO [stderr]    |
Nov 28 13:42:07.604 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Nov 28 13:42:07.604 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Nov 28 13:42:07.604 INFO [stderr]    |
Nov 28 13:42:07.604 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 28 13:42:07.604 INFO [stderr] 
Nov 28 13:42:07.604 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.604 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Nov 28 13:42:07.604 INFO [stderr]     |
Nov 28 13:42:07.604 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Nov 28 13:42:07.604 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.604 INFO [stderr] 
Nov 28 13:42:07.604 INFO [stderr] warning: unused variable: `operation`
Nov 28 13:42:07.604 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Nov 28 13:42:07.604 INFO [stderr]     |
Nov 28 13:42:07.604 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Nov 28 13:42:07.604 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Nov 28 13:42:07.604 INFO [stderr] 
Nov 28 13:42:07.604 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.604 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Nov 28 13:42:07.604 INFO [stderr]     |
Nov 28 13:42:07.604 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Nov 28 13:42:07.605 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.605 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.605 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Nov 28 13:42:07.605 INFO [stderr]     |
Nov 28 13:42:07.605 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 28 13:42:07.605 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.605 INFO [stderr] warning: unused variable: `constraint`
Nov 28 13:42:07.605 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Nov 28 13:42:07.605 INFO [stderr]     |
Nov 28 13:42:07.605 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 28 13:42:07.605 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.605 INFO [stderr] warning: unused variable: `idx`
Nov 28 13:42:07.605 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Nov 28 13:42:07.605 INFO [stderr]    |
Nov 28 13:42:07.605 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Nov 28 13:42:07.605 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.605 INFO [stderr] warning: unused variable: `val`
Nov 28 13:42:07.605 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Nov 28 13:42:07.605 INFO [stderr]    |
Nov 28 13:42:07.605 INFO [stderr] 37 |             }).map(|(idx, val)| {
Nov 28 13:42:07.605 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.605 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:42:07.605 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Nov 28 13:42:07.605 INFO [stderr]    |
Nov 28 13:42:07.605 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Nov 28 13:42:07.605 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Nov 28 13:42:07.605 INFO [stderr]    |             |
Nov 28 13:42:07.605 INFO [stderr]    |             help: remove this `mut`
Nov 28 13:42:07.605 INFO [stderr]    |
Nov 28 13:42:07.605 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:42:07.605 INFO [stderr] 
Nov 28 13:42:07.664 INFO [stderr] warning: variable does not need to be mutable
Nov 28 13:42:07.664 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Nov 28 13:42:07.664 INFO [stderr]    |
Nov 28 13:42:07.664 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Nov 28 13:42:07.664 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Nov 28 13:42:07.664 INFO [stderr]    |             |
Nov 28 13:42:07.664 INFO [stderr]    |             help: remove this `mut`
Nov 28 13:42:07.664 INFO [stderr]    |
Nov 28 13:42:07.664 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 28 13:42:07.664 INFO [stderr] 
Nov 28 13:42:07.683 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
Nov 28 13:42:07.692 INFO [stderr] su: No module specific data is present
Nov 28 13:42:08.186 INFO running `"docker" "inspect" "504ca8462c8d975b764d92ae6e9741819f20b49ef0518bb444579530d855781f"`
Nov 28 13:42:08.472 INFO running `"docker" "rm" "-f" "504ca8462c8d975b764d92ae6e9741819f20b49ef0518bb444579530d855781f"`
Nov 28 13:42:08.807 INFO [stdout] 504ca8462c8d975b764d92ae6e9741819f20b49ef0518bb444579530d855781f