[INFO] cloning repository Anfauglith/sudoku
[INFO] running `"git" "clone" "--bare" "git://github.com/Anfauglith/sudoku.git" "work/cache/sources/gh/Anfauglith/sudoku"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Anfauglith/sudoku'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Anfauglith/sudoku" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/Anfauglith/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/Anfauglith/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Anfauglith/sudoku" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/Anfauglith/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/Anfauglith/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 198a8b8f2a95bbbc42d9691a5c8a017d1b397c46
[INFO] sha for GitHub repo Anfauglith/sudoku: 198a8b8f2a95bbbc42d9691a5c8a017d1b397c46
[INFO] validating manifest of Anfauglith/sudoku on toolchain master#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Anfauglith/sudoku on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Anfauglith/sudoku
[INFO] finished frobbing Anfauglith/sudoku
[INFO] frobbed toml for Anfauglith/sudoku written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/Anfauglith/sudoku/Cargo.toml
[INFO] started frobbing Anfauglith/sudoku
[INFO] finished frobbing Anfauglith/sudoku
[INFO] frobbed toml for Anfauglith/sudoku written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/Anfauglith/sudoku/Cargo.toml
[INFO] crate Anfauglith/sudoku has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Anfauglith/sudoku against try#290ac7b29f41ff9fa5232f9a1116ea71a3501063 for pr-58899
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58899/worker-5/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/Anfauglith/sudoku:/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" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c7052b38b414d41a934007ecc2483323665353a919df360c879219b2e587e44f
[INFO] running `"docker" "start" "-a" "c7052b38b414d41a934007ecc2483323665353a919df360c879219b2e587e44f"`
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: constant item is never used: `CANDIDATE_MASK`
[INFO] [stderr]  --> src/field.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | const CANDIDATE_MASK: u16 = 0b0000_0011_1111_1110; // 0x03FE
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Field`
[INFO] [stderr]  --> src/field.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct Field {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Cell`
[INFO] [stderr]  --> src/field.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub struct Cell {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty_cell`
[INFO] [stderr]   --> src/field.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     pub fn empty_cell() -> Cell {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fixed_cell`
[INFO] [stderr]   --> src/field.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     pub fn fixed_cell(digit: u8) -> Cell {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_solved`
[INFO] [stderr]   --> src/field.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn is_solved(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_fixed`
[INFO] [stderr]   --> src/field.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn is_fixed(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_digit`
[INFO] [stderr]   --> src/field.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     pub fn get_digit(&self) -> Option<u8> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fix`
[INFO] [stderr]   --> src/field.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     fn fix(&mut self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_to`
[INFO] [stderr]   --> src/field.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     fn set_to(&mut self, digit: u8) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fix_to`
[INFO] [stderr]   --> src/field.rs:66:5
[INFO] [stderr]    |
[INFO] [stderr] 66 |     pub fn fix_to(&mut self, digit: u8) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `has_candidate`
[INFO] [stderr]   --> src/field.rs:73:5
[INFO] [stderr]    |
[INFO] [stderr] 73 |     pub fn has_candidate(&self, candidate: u8) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_candidates`
[INFO] [stderr]   --> src/field.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     pub fn get_candidates(&self) -> u16 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_candidate_vector`
[INFO] [stderr]   --> src/field.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn get_candidate_vector(&self) -> Vec<u8> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove_candidate`
[INFO] [stderr]   --> src/field.rs:91:5
[INFO] [stderr]    |
[INFO] [stderr] 91 |     pub fn remove_candidate(&mut self, candidate: u8) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `remove_candidates`
[INFO] [stderr]   --> src/field.rs:96:5
[INFO] [stderr]    |
[INFO] [stderr] 96 |     pub fn remove_candidates(&mut self, candidates: Vec<u8>) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `has_single_candidate`
[INFO] [stderr]    --> src/field.rs:102:5
[INFO] [stderr]     |
[INFO] [stderr] 102 |     pub fn has_single_candidate(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_naked_single`
[INFO] [stderr]    --> src/field.rs:106:5
[INFO] [stderr]     |
[INFO] [stderr] 106 |     pub fn get_naked_single(&self) -> Option<u8> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `try_solve`
[INFO] [stderr]    --> src/field.rs:119:5
[INFO] [stderr]     |
[INFO] [stderr] 119 |     pub fn try_solve(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Field`
[INFO] [stderr]  --> src/field.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct Field {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_solved`
[INFO] [stderr]   --> src/field.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn is_solved(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.70s
[INFO] running `"docker" "inspect" "c7052b38b414d41a934007ecc2483323665353a919df360c879219b2e587e44f"`
[INFO] running `"docker" "rm" "-f" "c7052b38b414d41a934007ecc2483323665353a919df360c879219b2e587e44f"`
[INFO] [stdout] c7052b38b414d41a934007ecc2483323665353a919df360c879219b2e587e44f