Nov 30 11:11:00.282 INFO checking EthanTheMaster/sudoku_solver against try#32252761328f59ccfadb1bafb8148c685bc830b3 for pr-56323
Nov 30 11:11:00.282 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56323/worker-6/try#32252761328f59ccfadb1bafb8148c685bc830b3:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56323/try#32252761328f59ccfadb1bafb8148c685bc830b3:/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 +32252761328f59ccfadb1bafb8148c685bc830b3-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 30 11:11:00.798 INFO [stdout] 25cd2ef0438086e69439fce27a0cbe85b4105c6b663ee8405c85b811b50abf9c
Nov 30 11:11:00.812 INFO running `"docker" "start" "-a" "25cd2ef0438086e69439fce27a0cbe85b4105c6b663ee8405c85b811b50abf9c"`
Nov 30 11:11:01.934 INFO [stderr] usermod: no changes
Nov 30 11:11:01.984 INFO [stderr]     Checking sudoku_solver v0.1.0 (/source)
Nov 30 11:11:02.797 INFO [stderr] warning: unused variable: `operation`
Nov 30 11:11:02.797 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Nov 30 11:11:02.797 INFO [stderr]    |
Nov 30 11:11:02.797 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Nov 30 11:11:02.797 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Nov 30 11:11:02.798 INFO [stderr]    |
Nov 30 11:11:02.798 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 30 11:11:02.798 INFO [stderr] 
Nov 30 11:11:02.798 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.798 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Nov 30 11:11:02.798 INFO [stderr]     |
Nov 30 11:11:02.798 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Nov 30 11:11:02.798 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.798 INFO [stderr] 
Nov 30 11:11:02.798 INFO [stderr] warning: unused variable: `operation`
Nov 30 11:11:02.798 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Nov 30 11:11:02.798 INFO [stderr]     |
Nov 30 11:11:02.798 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Nov 30 11:11:02.798 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Nov 30 11:11:02.798 INFO [stderr] 
Nov 30 11:11:02.798 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.798 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Nov 30 11:11:02.798 INFO [stderr]     |
Nov 30 11:11:02.798 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Nov 30 11:11:02.798 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.798 INFO [stderr] 
Nov 30 11:11:02.799 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.799 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Nov 30 11:11:02.799 INFO [stderr]     |
Nov 30 11:11:02.799 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 30 11:11:02.799 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.799 INFO [stderr] 
Nov 30 11:11:02.799 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.799 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Nov 30 11:11:02.799 INFO [stderr]     |
Nov 30 11:11:02.799 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 30 11:11:02.799 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.799 INFO [stderr] 
Nov 30 11:11:02.799 INFO [stderr] warning: unused variable: `idx`
Nov 30 11:11:02.799 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Nov 30 11:11:02.799 INFO [stderr]    |
Nov 30 11:11:02.799 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Nov 30 11:11:02.799 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Nov 30 11:11:02.799 INFO [stderr] 
Nov 30 11:11:02.804 INFO [stderr] warning: unused variable: `val`
Nov 30 11:11:02.804 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Nov 30 11:11:02.804 INFO [stderr]    |
Nov 30 11:11:02.804 INFO [stderr] 37 |             }).map(|(idx, val)| {
Nov 30 11:11:02.804 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Nov 30 11:11:02.804 INFO [stderr] 
Nov 30 11:11:02.883 INFO [stderr] warning: unused variable: `operation`
Nov 30 11:11:02.883 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Nov 30 11:11:02.883 INFO [stderr]    |
Nov 30 11:11:02.883 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Nov 30 11:11:02.883 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Nov 30 11:11:02.883 INFO [stderr]    |
Nov 30 11:11:02.883 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Nov 30 11:11:02.884 INFO [stderr] 
Nov 30 11:11:02.884 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.884 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Nov 30 11:11:02.884 INFO [stderr]     |
Nov 30 11:11:02.884 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Nov 30 11:11:02.892 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `operation`
Nov 30 11:11:02.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Nov 30 11:11:02.892 INFO [stderr]     |
Nov 30 11:11:02.892 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Nov 30 11:11:02.892 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Nov 30 11:11:02.892 INFO [stderr]     |
Nov 30 11:11:02.892 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Nov 30 11:11:02.892 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Nov 30 11:11:02.892 INFO [stderr]     |
Nov 30 11:11:02.892 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 30 11:11:02.892 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `constraint`
Nov 30 11:11:02.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Nov 30 11:11:02.892 INFO [stderr]     |
Nov 30 11:11:02.892 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Nov 30 11:11:02.892 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `idx`
Nov 30 11:11:02.892 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Nov 30 11:11:02.892 INFO [stderr]    |
Nov 30 11:11:02.892 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Nov 30 11:11:02.892 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.892 INFO [stderr] warning: unused variable: `val`
Nov 30 11:11:02.892 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Nov 30 11:11:02.892 INFO [stderr]    |
Nov 30 11:11:02.892 INFO [stderr] 37 |             }).map(|(idx, val)| {
Nov 30 11:11:02.892 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Nov 30 11:11:02.892 INFO [stderr] 
Nov 30 11:11:02.932 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:11:02.932 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Nov 30 11:11:02.932 INFO [stderr]    |
Nov 30 11:11:02.932 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Nov 30 11:11:02.932 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Nov 30 11:11:02.932 INFO [stderr]    |             |
Nov 30 11:11:02.932 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:11:02.932 INFO [stderr]    |
Nov 30 11:11:02.932 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 11:11:02.932 INFO [stderr] 
Nov 30 11:11:02.992 INFO [stderr] warning: variable does not need to be mutable
Nov 30 11:11:02.992 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Nov 30 11:11:02.992 INFO [stderr]    |
Nov 30 11:11:02.992 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Nov 30 11:11:02.992 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Nov 30 11:11:02.992 INFO [stderr]    |             |
Nov 30 11:11:02.992 INFO [stderr]    |             help: remove this `mut`
Nov 30 11:11:02.992 INFO [stderr]    |
Nov 30 11:11:02.992 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Nov 30 11:11:02.992 INFO [stderr] 
Nov 30 11:11:03.019 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
Nov 30 11:11:03.025 INFO [stderr] su: No module specific data is present
Nov 30 11:11:03.962 INFO running `"docker" "inspect" "25cd2ef0438086e69439fce27a0cbe85b4105c6b663ee8405c85b811b50abf9c"`
Nov 30 11:11:04.220 INFO running `"docker" "rm" "-f" "25cd2ef0438086e69439fce27a0cbe85b4105c6b663ee8405c85b811b50abf9c"`
Nov 30 11:11:04.454 INFO [stdout] 25cd2ef0438086e69439fce27a0cbe85b4105c6b663ee8405c85b811b50abf9c