Dec 05 02:36:17.692 INFO checking EthanTheMaster/sudoku_solver against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 02:36:17.692 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-5/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/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 +1df97983eb2057dc6a8f7eb364e263b51ae23230-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"`
Dec 05 02:36:18.161 INFO [stdout] ca82b034d00a7343a4aaa42c5c68d56e8828a642054c72fe14a9a83e4d69d0ba
Dec 05 02:36:18.161 INFO running `"docker" "start" "-a" "ca82b034d00a7343a4aaa42c5c68d56e8828a642054c72fe14a9a83e4d69d0ba"`
Dec 05 02:36:19.496 INFO [stderr] usermod: no changes
Dec 05 02:36:19.550 INFO [stderr]     Checking sudoku_solver v0.1.0 (/source)
Dec 05 02:36:20.346 INFO [stderr] warning: unused variable: `operation`
Dec 05 02:36:20.346 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 05 02:36:20.346 INFO [stderr]    |
Dec 05 02:36:20.346 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 05 02:36:20.346 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 05 02:36:20.346 INFO [stderr]    |
Dec 05 02:36:20.346 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 05 02:36:20.346 INFO [stderr] 
Dec 05 02:36:20.347 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.347 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 05 02:36:20.347 INFO [stderr]     |
Dec 05 02:36:20.347 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 05 02:36:20.347 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.347 INFO [stderr] 
Dec 05 02:36:20.347 INFO [stderr] warning: unused variable: `operation`
Dec 05 02:36:20.347 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 05 02:36:20.347 INFO [stderr]     |
Dec 05 02:36:20.347 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 05 02:36:20.347 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 05 02:36:20.347 INFO [stderr] 
Dec 05 02:36:20.347 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.347 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 05 02:36:20.347 INFO [stderr]     |
Dec 05 02:36:20.347 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 05 02:36:20.347 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.347 INFO [stderr] 
Dec 05 02:36:20.359 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.359 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 05 02:36:20.359 INFO [stderr]     |
Dec 05 02:36:20.359 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 05 02:36:20.359 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.359 INFO [stderr] 
Dec 05 02:36:20.359 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.359 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 05 02:36:20.359 INFO [stderr]     |
Dec 05 02:36:20.359 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 05 02:36:20.359 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.359 INFO [stderr] 
Dec 05 02:36:20.359 INFO [stderr] warning: unused variable: `idx`
Dec 05 02:36:20.359 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 05 02:36:20.359 INFO [stderr]    |
Dec 05 02:36:20.359 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 05 02:36:20.359 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 05 02:36:20.359 INFO [stderr] 
Dec 05 02:36:20.359 INFO [stderr] warning: unused variable: `val`
Dec 05 02:36:20.359 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 05 02:36:20.359 INFO [stderr]    |
Dec 05 02:36:20.359 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 05 02:36:20.359 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 05 02:36:20.359 INFO [stderr] 
Dec 05 02:36:20.415 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:36:20.415 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 05 02:36:20.415 INFO [stderr]    |
Dec 05 02:36:20.415 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 05 02:36:20.415 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 05 02:36:20.415 INFO [stderr]    |             |
Dec 05 02:36:20.415 INFO [stderr]    |             help: remove this `mut`
Dec 05 02:36:20.415 INFO [stderr]    |
Dec 05 02:36:20.415 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:36:20.415 INFO [stderr] 
Dec 05 02:36:20.525 INFO [stderr] warning: unused variable: `operation`
Dec 05 02:36:20.525 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 05 02:36:20.525 INFO [stderr]    |
Dec 05 02:36:20.525 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 05 02:36:20.525 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 05 02:36:20.525 INFO [stderr]    |
Dec 05 02:36:20.525 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 05 02:36:20.525 INFO [stderr] 
Dec 05 02:36:20.525 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.525 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 05 02:36:20.525 INFO [stderr]     |
Dec 05 02:36:20.525 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 05 02:36:20.525 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.525 INFO [stderr] 
Dec 05 02:36:20.525 INFO [stderr] warning: unused variable: `operation`
Dec 05 02:36:20.525 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 05 02:36:20.525 INFO [stderr]     |
Dec 05 02:36:20.525 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 05 02:36:20.525 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 05 02:36:20.525 INFO [stderr] 
Dec 05 02:36:20.526 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.526 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 05 02:36:20.526 INFO [stderr]     |
Dec 05 02:36:20.526 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 05 02:36:20.526 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.526 INFO [stderr] 
Dec 05 02:36:20.526 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.526 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 05 02:36:20.526 INFO [stderr]     |
Dec 05 02:36:20.526 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 05 02:36:20.526 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.526 INFO [stderr] 
Dec 05 02:36:20.526 INFO [stderr] warning: unused variable: `constraint`
Dec 05 02:36:20.526 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 05 02:36:20.526 INFO [stderr]     |
Dec 05 02:36:20.526 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 05 02:36:20.526 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 05 02:36:20.526 INFO [stderr] 
Dec 05 02:36:20.526 INFO [stderr] warning: unused variable: `idx`
Dec 05 02:36:20.526 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 05 02:36:20.526 INFO [stderr]    |
Dec 05 02:36:20.526 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 05 02:36:20.526 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 05 02:36:20.526 INFO [stderr] 
Dec 05 02:36:20.526 INFO [stderr] warning: unused variable: `val`
Dec 05 02:36:20.526 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 05 02:36:20.526 INFO [stderr]    |
Dec 05 02:36:20.526 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 05 02:36:20.526 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 05 02:36:20.526 INFO [stderr] 
Dec 05 02:36:20.576 INFO [stderr] warning: variable does not need to be mutable
Dec 05 02:36:20.576 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 05 02:36:20.576 INFO [stderr]    |
Dec 05 02:36:20.576 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 05 02:36:20.576 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 05 02:36:20.576 INFO [stderr]    |             |
Dec 05 02:36:20.576 INFO [stderr]    |             help: remove this `mut`
Dec 05 02:36:20.576 INFO [stderr]    |
Dec 05 02:36:20.576 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 02:36:20.576 INFO [stderr] 
Dec 05 02:36:20.595 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
Dec 05 02:36:20.596 INFO [stderr] su: No module specific data is present
Dec 05 02:36:21.191 INFO running `"docker" "inspect" "ca82b034d00a7343a4aaa42c5c68d56e8828a642054c72fe14a9a83e4d69d0ba"`
Dec 05 02:36:21.544 INFO running `"docker" "rm" "-f" "ca82b034d00a7343a4aaa42c5c68d56e8828a642054c72fe14a9a83e4d69d0ba"`
Dec 05 02:36:21.784 INFO [stdout] ca82b034d00a7343a4aaa42c5c68d56e8828a642054c72fe14a9a83e4d69d0ba