Dec 18 07:45:03.124 INFO checking EthanTheMaster/sudoku_solver against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 07:45:03.124 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 07:45:03.610 INFO [stdout] 249cb4fda181f328743ee1a2f24883b584cbf443f3d01d351b9d5f5df0604552
Dec 18 07:45:03.612 INFO running `"docker" "start" "-a" "249cb4fda181f328743ee1a2f24883b584cbf443f3d01d351b9d5f5df0604552"`
Dec 18 07:45:05.241 INFO [stderr]     Checking sudoku_solver v0.1.0 (/opt/crater/workdir)
Dec 18 07:45:05.891 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:05.891 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 18 07:45:05.891 INFO [stderr]    |
Dec 18 07:45:05.891 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 18 07:45:05.891 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:05.892 INFO [stderr]    |
Dec 18 07:45:05.892 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 18 07:45:05.892 INFO [stderr]     |
Dec 18 07:45:05.892 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 18 07:45:05.892 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:05.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 18 07:45:05.892 INFO [stderr]     |
Dec 18 07:45:05.892 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 18 07:45:05.892 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 18 07:45:05.892 INFO [stderr]     |
Dec 18 07:45:05.892 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 18 07:45:05.892 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 18 07:45:05.892 INFO [stderr]     |
Dec 18 07:45:05.892 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:05.892 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.892 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 18 07:45:05.892 INFO [stderr]     |
Dec 18 07:45:05.892 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:05.892 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `idx`
Dec 18 07:45:05.892 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 18 07:45:05.892 INFO [stderr]    |
Dec 18 07:45:05.892 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 18 07:45:05.892 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.892 INFO [stderr] warning: unused variable: `val`
Dec 18 07:45:05.892 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 18 07:45:05.892 INFO [stderr]    |
Dec 18 07:45:05.892 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 18 07:45:05.892 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 18 07:45:05.892 INFO [stderr] 
Dec 18 07:45:05.912 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:05.913 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 18 07:45:05.913 INFO [stderr]    |
Dec 18 07:45:05.913 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 18 07:45:05.913 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:05.913 INFO [stderr]    |
Dec 18 07:45:05.913 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 07:45:05.913 INFO [stderr] 
Dec 18 07:45:05.913 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.916 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 18 07:45:05.916 INFO [stderr]     |
Dec 18 07:45:05.916 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 18 07:45:05.916 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.916 INFO [stderr] 
Dec 18 07:45:05.916 INFO [stderr] warning: unused variable: `operation`
Dec 18 07:45:05.916 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 18 07:45:05.916 INFO [stderr]     |
Dec 18 07:45:05.916 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 18 07:45:05.916 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 18 07:45:05.916 INFO [stderr] 
Dec 18 07:45:05.916 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.916 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 18 07:45:05.916 INFO [stderr]     |
Dec 18 07:45:05.916 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 18 07:45:05.916 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.917 INFO [stderr] 
Dec 18 07:45:05.917 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.917 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 18 07:45:05.917 INFO [stderr]     |
Dec 18 07:45:05.917 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:05.917 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.917 INFO [stderr] 
Dec 18 07:45:05.917 INFO [stderr] warning: unused variable: `constraint`
Dec 18 07:45:05.917 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 18 07:45:05.917 INFO [stderr]     |
Dec 18 07:45:05.917 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 18 07:45:05.917 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 18 07:45:05.917 INFO [stderr] 
Dec 18 07:45:05.917 INFO [stderr] warning: unused variable: `idx`
Dec 18 07:45:05.917 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 18 07:45:05.917 INFO [stderr]    |
Dec 18 07:45:05.917 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 18 07:45:05.917 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 18 07:45:05.917 INFO [stderr] 
Dec 18 07:45:05.917 INFO [stderr] warning: unused variable: `val`
Dec 18 07:45:05.917 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 18 07:45:05.917 INFO [stderr]    |
Dec 18 07:45:05.917 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 18 07:45:05.917 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 18 07:45:05.917 INFO [stderr] 
Dec 18 07:45:05.988 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:45:05.988 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 18 07:45:05.988 INFO [stderr]    |
Dec 18 07:45:05.988 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 18 07:45:05.988 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 18 07:45:05.988 INFO [stderr]    |             |
Dec 18 07:45:05.988 INFO [stderr]    |             help: remove this `mut`
Dec 18 07:45:05.988 INFO [stderr]    |
Dec 18 07:45:05.988 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:45:05.988 INFO [stderr] 
Dec 18 07:45:05.996 INFO [stderr] warning: variable does not need to be mutable
Dec 18 07:45:05.996 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 18 07:45:05.996 INFO [stderr]    |
Dec 18 07:45:05.996 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 18 07:45:05.996 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 18 07:45:05.996 INFO [stderr]    |             |
Dec 18 07:45:05.996 INFO [stderr]    |             help: remove this `mut`
Dec 18 07:45:05.996 INFO [stderr]    |
Dec 18 07:45:05.997 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 07:45:05.997 INFO [stderr] 
Dec 18 07:45:06.068 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
Dec 18 07:45:07.200 INFO running `"docker" "inspect" "249cb4fda181f328743ee1a2f24883b584cbf443f3d01d351b9d5f5df0604552"`
Dec 18 07:45:07.490 INFO running `"docker" "rm" "-f" "249cb4fda181f328743ee1a2f24883b584cbf443f3d01d351b9d5f5df0604552"`
Dec 18 07:45:07.766 INFO [stdout] 249cb4fda181f328743ee1a2f24883b584cbf443f3d01d351b9d5f5df0604552