Dec 12 02:56:10.225 INFO checking EthanTheMaster/sudoku_solver against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 02:56:10.225 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-1/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/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 +aa9aa79c3c583aab59ac9134542d60a780c35e2e-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 12 02:56:10.769 INFO [stdout] 67648ab2c0eab7107f6a69d7a46e6ac9f453f43daa5511f84555c28aa094c826
Dec 12 02:56:10.796 INFO running `"docker" "start" "-a" "67648ab2c0eab7107f6a69d7a46e6ac9f453f43daa5511f84555c28aa094c826"`
Dec 12 02:56:11.903 INFO [stderr] usermod: no changes
Dec 12 02:56:11.979 INFO [stderr]     Checking sudoku_solver v0.1.0 (/source)
Dec 12 02:56:12.971 INFO [stderr] warning: unused variable: `operation`
Dec 12 02:56:12.971 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 12 02:56:12.971 INFO [stderr]    |
Dec 12 02:56:12.971 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 12 02:56:12.971 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 12 02:56:12.971 INFO [stderr]    |
Dec 12 02:56:12.971 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 02:56:12.971 INFO [stderr] 
Dec 12 02:56:12.971 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.971 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 12 02:56:12.971 INFO [stderr]     |
Dec 12 02:56:12.971 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 12 02:56:12.971 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.971 INFO [stderr] 
Dec 12 02:56:12.971 INFO [stderr] warning: unused variable: `operation`
Dec 12 02:56:12.971 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 12 02:56:12.971 INFO [stderr]     |
Dec 12 02:56:12.971 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 12 02:56:12.971 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 12 02:56:12.971 INFO [stderr] 
Dec 12 02:56:12.971 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.971 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 12 02:56:12.971 INFO [stderr]     |
Dec 12 02:56:12.971 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 12 02:56:12.971 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.971 INFO [stderr] 
Dec 12 02:56:12.971 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.971 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 12 02:56:12.971 INFO [stderr]     |
Dec 12 02:56:12.971 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 12 02:56:12.971 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.971 INFO [stderr] 
Dec 12 02:56:12.979 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.979 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 12 02:56:12.979 INFO [stderr]     |
Dec 12 02:56:12.979 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 12 02:56:12.979 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.979 INFO [stderr] 
Dec 12 02:56:12.979 INFO [stderr] warning: unused variable: `idx`
Dec 12 02:56:12.979 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 12 02:56:12.979 INFO [stderr]    |
Dec 12 02:56:12.979 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 12 02:56:12.979 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 12 02:56:12.979 INFO [stderr] 
Dec 12 02:56:12.979 INFO [stderr] warning: unused variable: `val`
Dec 12 02:56:12.979 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 12 02:56:12.979 INFO [stderr]    |
Dec 12 02:56:12.979 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 12 02:56:12.979 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 12 02:56:12.979 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `operation`
Dec 12 02:56:12.993 INFO [stderr]   --> src/sudoku_solver_dancinglinks/mod.rs:96:32
Dec 12 02:56:12.993 INFO [stderr]    |
Dec 12 02:56:12.993 INFO [stderr] 96 |         if let NodeType::Field(operation, column_header_id) = node_type {
Dec 12 02:56:12.993 INFO [stderr]    |                                ^^^^^^^^^ help: consider using `_operation` instead
Dec 12 02:56:12.993 INFO [stderr]    |
Dec 12 02:56:12.993 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.993 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:100:48
Dec 12 02:56:12.993 INFO [stderr]     |
Dec 12 02:56:12.993 INFO [stderr] 100 |                 NodeType::ColumnHeader(ref mut constraint, ref mut size) => {
Dec 12 02:56:12.993 INFO [stderr]     |                                                ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `operation`
Dec 12 02:56:12.993 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:119:29
Dec 12 02:56:12.993 INFO [stderr]     |
Dec 12 02:56:12.993 INFO [stderr] 119 |             NodeType::Field(operation, column_header_id) => {
Dec 12 02:56:12.993 INFO [stderr]     |                             ^^^^^^^^^ help: consider using `_operation` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.993 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:127:36
Dec 12 02:56:12.993 INFO [stderr]     |
Dec 12 02:56:12.993 INFO [stderr] 127 |             NodeType::ColumnHeader(constraint, size) => {
Dec 12 02:56:12.993 INFO [stderr]     |                                    ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.993 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:226:44
Dec 12 02:56:12.993 INFO [stderr]     |
Dec 12 02:56:12.993 INFO [stderr] 226 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 12 02:56:12.993 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `constraint`
Dec 12 02:56:12.993 INFO [stderr]    --> src/sudoku_solver_dancinglinks/mod.rs:269:44
Dec 12 02:56:12.993 INFO [stderr]     |
Dec 12 02:56:12.993 INFO [stderr] 269 |                     NodeType::ColumnHeader(constraint, ref mut size) => {
Dec 12 02:56:12.993 INFO [stderr]     |                                            ^^^^^^^^^^ help: consider using `_constraint` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `idx`
Dec 12 02:56:12.993 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:35:24
Dec 12 02:56:12.993 INFO [stderr]    |
Dec 12 02:56:12.993 INFO [stderr] 35 |             .filter(|&(idx, val)| {
Dec 12 02:56:12.993 INFO [stderr]    |                        ^^^ help: consider using `_idx` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:12.993 INFO [stderr] warning: unused variable: `val`
Dec 12 02:56:12.993 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:37:27
Dec 12 02:56:12.993 INFO [stderr]    |
Dec 12 02:56:12.993 INFO [stderr] 37 |             }).map(|(idx, val)| {
Dec 12 02:56:12.993 INFO [stderr]    |                           ^^^ help: consider using `_val` instead
Dec 12 02:56:12.993 INFO [stderr] 
Dec 12 02:56:13.028 INFO [stderr] warning: variable does not need to be mutable
Dec 12 02:56:13.028 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 12 02:56:13.028 INFO [stderr]    |
Dec 12 02:56:13.028 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 12 02:56:13.028 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 12 02:56:13.028 INFO [stderr]    |             |
Dec 12 02:56:13.028 INFO [stderr]    |             help: remove this `mut`
Dec 12 02:56:13.028 INFO [stderr]    |
Dec 12 02:56:13.028 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 02:56:13.028 INFO [stderr] 
Dec 12 02:56:13.052 INFO [stderr] warning: variable does not need to be mutable
Dec 12 02:56:13.052 INFO [stderr]   --> src/sudoku_solver_backtrack/mod.rs:34:13
Dec 12 02:56:13.052 INFO [stderr]    |
Dec 12 02:56:13.052 INFO [stderr] 34 |         let mut blank_positions: Vec<usize> = self.board.iter().enumerate()
Dec 12 02:56:13.052 INFO [stderr]    |             ----^^^^^^^^^^^^^^^
Dec 12 02:56:13.052 INFO [stderr]    |             |
Dec 12 02:56:13.052 INFO [stderr]    |             help: remove this `mut`
Dec 12 02:56:13.052 INFO [stderr]    |
Dec 12 02:56:13.052 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 02:56:13.052 INFO [stderr] 
Dec 12 02:56:13.098 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.16s
Dec 12 02:56:13.100 INFO [stderr] su: No module specific data is present
Dec 12 02:56:13.810 INFO running `"docker" "inspect" "67648ab2c0eab7107f6a69d7a46e6ac9f453f43daa5511f84555c28aa094c826"`
Dec 12 02:56:14.126 INFO running `"docker" "rm" "-f" "67648ab2c0eab7107f6a69d7a46e6ac9f453f43daa5511f84555c28aa094c826"`
Dec 12 02:56:14.516 INFO [stdout] 67648ab2c0eab7107f6a69d7a46e6ac9f453f43daa5511f84555c28aa094c826