Dec 18 07:45:05.905 INFO checking EthanTheMaster/sudoku_solver against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 07:45:05.905 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/EthanTheMaster/sudoku_solver:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 07:45:06.368 INFO [stdout] 553de0a15f93a7ba4758051d4eaa4c4dec6c7fee5ce4a2df786ac45b09462c73
Dec 18 07:45:06.373 INFO running `"docker" "start" "-a" "553de0a15f93a7ba4758051d4eaa4c4dec6c7fee5ce4a2df786ac45b09462c73"`
Dec 18 07:45:07.858 INFO [stderr]     Checking sudoku_solver v0.1.0 (/opt/crater/workdir)
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:08.544 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 18 07:45:08.544 INFO [stderr]    |
Dec 18 07:45:08.544 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 18 07:45:08.544 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:08.544 INFO [stderr]    |
Dec 18 07:45:08.544 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.544 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 18 07:45:08.544 INFO [stderr]     |
Dec 18 07:45:08.544 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 18 07:45:08.544 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:08.544 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 18 07:45:08.544 INFO [stderr]     |
Dec 18 07:45:08.544 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 18 07:45:08.544 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.544 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 18 07:45:08.544 INFO [stderr]     |
Dec 18 07:45:08.544 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 18 07:45:08.544 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.544 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 18 07:45:08.544 INFO [stderr]     |
Dec 18 07:45:08.544 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:08.544 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.544 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 18 07:45:08.544 INFO [stderr]     |
Dec 18 07:45:08.544 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:08.544 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.544 INFO [stderr] 
Dec 18 07:45:08.544 INFO [stderr] warning: unused variable: `idx`
Dec 18 07:45:08.544 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 18 07:45:08.544 INFO [stderr]    |
Dec 18 07:45:08.544 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 18 07:45:08.545 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 18 07:45:08.545 INFO [stderr] 
Dec 18 07:45:08.545 INFO [stderr] warning: unused variable: `val`
Dec 18 07:45:08.545 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 18 07:45:08.545 INFO [stderr]    |
Dec 18 07:45:08.545 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 18 07:45:08.545 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 18 07:45:08.545 INFO [stderr] 
Dec 18 07:45:08.604 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:45:08.604 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 18 07:45:08.604 INFO [stderr]    |
Dec 18 07:45:08.604 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 18 07:45:08.604 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 18 07:45:08.604 INFO [stderr]    |             |
Dec 18 07:45:08.604 INFO [stderr]    |             help: remove this `mut`
Dec 18 07:45:08.604 INFO [stderr]    |
Dec 18 07:45:08.604 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:45:08.604 INFO [stderr] 
Dec 18 07:45:08.692 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:08.692 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 18 07:45:08.692 INFO [stderr]    |
Dec 18 07:45:08.692 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 18 07:45:08.692 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:08.692 INFO [stderr]    |
Dec 18 07:45:08.692 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 07:45:08.692 INFO [stderr] 
Dec 18 07:45:08.692 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.692 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 18 07:45:08.692 INFO [stderr]     |
Dec 18 07:45:08.692 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 18 07:45:08.692 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:08.693 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 18 07:45:08.693 INFO [stderr]     |
Dec 18 07:45:08.693 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 18 07:45:08.693 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.693 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 18 07:45:08.693 INFO [stderr]     |
Dec 18 07:45:08.693 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 18 07:45:08.693 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.693 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 18 07:45:08.693 INFO [stderr]     |
Dec 18 07:45:08.693 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:08.693 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:08.693 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 18 07:45:08.693 INFO [stderr]     |
Dec 18 07:45:08.693 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:08.693 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `idx`
Dec 18 07:45:08.693 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 18 07:45:08.693 INFO [stderr]    |
Dec 18 07:45:08.693 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 18 07:45:08.693 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.693 INFO [stderr] warning: unused variable: `val`
Dec 18 07:45:08.693 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 18 07:45:08.693 INFO [stderr]    |
Dec 18 07:45:08.693 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 18 07:45:08.693 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 18 07:45:08.693 INFO [stderr] 
Dec 18 07:45:08.776 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:45:08.776 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 18 07:45:08.776 INFO [stderr]    |
Dec 18 07:45:08.776 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 18 07:45:08.776 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 18 07:45:08.776 INFO [stderr]    |             |
Dec 18 07:45:08.776 INFO [stderr]    |             help: remove this `mut`
Dec 18 07:45:08.776 INFO [stderr]    |
Dec 18 07:45:08.776 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:45:08.776 INFO [stderr] 
Dec 18 07:45:08.824 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.01s
Dec 18 07:45:09.492 INFO running `"docker" "inspect" "553de0a15f93a7ba4758051d4eaa4c4dec6c7fee5ce4a2df786ac45b09462c73"`
Dec 18 07:45:09.726 INFO running `"docker" "rm" "-f" "553de0a15f93a7ba4758051d4eaa4c4dec6c7fee5ce4a2df786ac45b09462c73"`
Dec 18 07:45:09.992 INFO [stdout] 553de0a15f93a7ba4758051d4eaa4c4dec6c7fee5ce4a2df786ac45b09462c73