[INFO] updating cached repository EkardNT/sudoku [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/EkardNT/sudoku [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/EkardNT/sudoku" "work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/EkardNT/sudoku"` [INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/EkardNT/sudoku'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/EkardNT/sudoku" "work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/EkardNT/sudoku"` [INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/EkardNT/sudoku'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 3d13dad9d3a68019eab7c5cce1291d514f6f6e5e [INFO] sha for GitHub repo EkardNT/sudoku: 3d13dad9d3a68019eab7c5cce1291d514f6f6e5e [INFO] validating manifest of EkardNT/sudoku on toolchain master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of EkardNT/sudoku on toolchain try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing EkardNT/sudoku [INFO] finished frobbing EkardNT/sudoku [INFO] frobbed toml for EkardNT/sudoku written to work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/EkardNT/sudoku/Cargo.toml [INFO] started frobbing EkardNT/sudoku [INFO] finished frobbing EkardNT/sudoku [INFO] frobbed toml for EkardNT/sudoku written to work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/EkardNT/sudoku/Cargo.toml [INFO] crate EkardNT/sudoku already has a lockfile, it will not be regenerated [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking EkardNT/sudoku against master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 for pr-59199 [INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59199/worker-7/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/EkardNT/sudoku:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 70a081dc0e8d9841b76b6ef05e69dd313ee14d8f5c03c55e15dce3b4ebb1d8d9 [INFO] running `"docker" "start" "-a" "70a081dc0e8d9841b76b6ef05e69dd313ee14d8f5c03c55e15dce3b4ebb1d8d9"` [INFO] [stderr] Checking sudoku v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:185:15 [INFO] [stderr] | [INFO] [stderr] 185 | while (current_down_index != header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:191:19 [INFO] [stderr] | [INFO] [stderr] 191 | while (current_right_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:223:15 [INFO] [stderr] | [INFO] [stderr] 223 | while (current_up_index != header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:229:19 [INFO] [stderr] | [INFO] [stderr] 229 | while (current_left_index != current_up_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:307:15 [INFO] [stderr] | [INFO] [stderr] 307 | while (current_down_index != min_header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:313:19 [INFO] [stderr] | [INFO] [stderr] 313 | while (current_right_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:332:19 [INFO] [stderr] | [INFO] [stderr] 332 | while (current_left_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:358:15 [INFO] [stderr] | [INFO] [stderr] 358 | while (current_header_index != Matrix::ROOT_INDEX) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/matrix.rs:376:24 [INFO] [stderr] | [INFO] [stderr] 376 | if (current_index == row_front_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unused imports: `Debug`, `Display`, `Formatter`, `Write` [INFO] [stderr] --> src/lib.rs:5:16 [INFO] [stderr] | [INFO] [stderr] 5 | use std::fmt::{Display, Write, Formatter, Debug}; [INFO] [stderr] | ^^^^^^^ ^^^^^ ^^^^^^^^^ ^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::str::FromStr` [INFO] [stderr] --> src/lib.rs:6:5 [INFO] [stderr] | [INFO] [stderr] 6 | use std::str::FromStr; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `matrix::*` [INFO] [stderr] --> src/lib.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | use matrix::*; [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:185:15 [INFO] [stderr] | [INFO] [stderr] 185 | while (current_down_index != header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:191:19 [INFO] [stderr] | [INFO] [stderr] 191 | while (current_right_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:223:15 [INFO] [stderr] | [INFO] [stderr] 223 | while (current_up_index != header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:229:19 [INFO] [stderr] | [INFO] [stderr] 229 | while (current_left_index != current_up_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:307:15 [INFO] [stderr] | [INFO] [stderr] 307 | while (current_down_index != min_header_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:313:19 [INFO] [stderr] | [INFO] [stderr] 313 | while (current_right_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:332:19 [INFO] [stderr] | [INFO] [stderr] 332 | while (current_left_index != current_down_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/matrix.rs:358:15 [INFO] [stderr] | [INFO] [stderr] 358 | while (current_header_index != Matrix::ROOT_INDEX) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/matrix.rs:376:24 [INFO] [stderr] | [INFO] [stderr] 376 | if (current_index == row_front_index) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unused imports: `NodeKind`, `Node` [INFO] [stderr] --> src/matrix.rs:389:25 [INFO] [stderr] | [INFO] [stderr] 389 | use super::{Matrix, Node, NodeKind}; [INFO] [stderr] | ^^^^ ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused imports: `Debug`, `Display`, `Formatter`, `Write` [INFO] [stderr] --> src/lib.rs:5:16 [INFO] [stderr] | [INFO] [stderr] 5 | use std::fmt::{Display, Write, Formatter, Debug}; [INFO] [stderr] | ^^^^^^^ ^^^^^ ^^^^^^^^^ ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::str::FromStr` [INFO] [stderr] --> src/lib.rs:6:5 [INFO] [stderr] | [INFO] [stderr] 6 | use std::str::FromStr; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `matrix::*` [INFO] [stderr] --> src/lib.rs:9:5 [INFO] [stderr] | [INFO] [stderr] 9 | use matrix::*; [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sparse_row` [INFO] [stderr] --> src/lib.rs:95:17 [INFO] [stderr] | [INFO] [stderr] 95 | let sparse_row = SparseRow::new(row_index); [INFO] [stderr] | ^^^^^^^^^^ help: consider prefixing with an underscore: `_sparse_row` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `board` [INFO] [stderr] --> src/lib.rs:123:25 [INFO] [stderr] | [INFO] [stderr] 123 | fn solve(&mut self, board: &mut Board) -> Result<(), ()> { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_board` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `column` [INFO] [stderr] --> src/coords.rs:119:28 [INFO] [stderr] | [INFO] [stderr] 119 | pub fn to_dense(&self, column: &SparseColumn) -> DenseRow { [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_column` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/board.rs:211:13 [INFO] [stderr] | [INFO] [stderr] 211 | let i = col + row * 9; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:65:13 [INFO] [stderr] | [INFO] [stderr] 65 | let mut matrix = [[Link::default(); NONZERO_CONSTRAINTS_PER_POSSIBILITY]; POSSIBILITIES]; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_mut)] on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:66:13 [INFO] [stderr] | [INFO] [stderr] 66 | let mut headers = [Header::default(); CONSTRAINTS]; [INFO] [stderr] | ----^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:114:9 [INFO] [stderr] | [INFO] [stderr] 114 | let mut constraint: &mut Link = &mut row[dense_column_index]; [INFO] [stderr] | ----^^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: method is never used: `to_sparse` [INFO] [stderr] --> src/coords.rs:18:5 [INFO] [stderr] | [INFO] [stderr] 18 | pub fn to_sparse(&self) -> SparseRow { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: method is never used: `to_sparse` [INFO] [stderr] --> src/coords.rs:130:5 [INFO] [stderr] | [INFO] [stderr] 130 | pub fn to_sparse(&self, row: &DenseRow) -> SparseColumn { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `POSSIBILITIES` [INFO] [stderr] --> src/matrix.rs:5:1 [INFO] [stderr] | [INFO] [stderr] 5 | const POSSIBILITIES: usize = 9 * 9 * 9; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `CONSTRAINTS` [INFO] [stderr] --> src/matrix.rs:9:1 [INFO] [stderr] | [INFO] [stderr] 9 | const CONSTRAINTS: usize = 9 * 9 + 9 * 9 + 9 * 9 + 9 * 9; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `NONZERO_CONSTRAINTS_PER_POSSIBILITY` [INFO] [stderr] --> src/matrix.rs:13:1 [INFO] [stderr] | [INFO] [stderr] 13 | const NONZERO_CONSTRAINTS_PER_POSSIBILITY: usize = 4; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `MATRIX_NODE_COUNT` [INFO] [stderr] --> src/matrix.rs:16:1 [INFO] [stderr] | [INFO] [stderr] 16 | const MATRIX_NODE_COUNT: usize = 1 + CONSTRAINTS + POSSIBILITIES * NONZERO_CONSTRAINTS_PER_POSSIBILITY; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/matrix.rs:359:13 [INFO] [stderr] | [INFO] [stderr] 359 | writeln!(f, "col {:?}", self.nodes[current_header_index]); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:84:13 [INFO] [stderr] | [INFO] [stderr] 84 | write!(to, "{} ", c); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:86:9 [INFO] [stderr] | [INFO] [stderr] 86 | write!(to, "{}", self.entries[9*9-1]); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: comparison is useless due to type limits [INFO] [stderr] --> src/board.rs:158:25 [INFO] [stderr] | [INFO] [stderr] 158 | assert!(value >= 0 && value <= 9); [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_comparisons)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:202:13 [INFO] [stderr] | [INFO] [stderr] 202 | fmt_row(self, f, &mut buf, row); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sparse_row` [INFO] [stderr] --> src/lib.rs:95:17 [INFO] [stderr] | [INFO] [stderr] 95 | let sparse_row = SparseRow::new(row_index); [INFO] [stderr] | ^^^^^^^^^^ help: consider prefixing with an underscore: `_sparse_row` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `board` [INFO] [stderr] --> src/lib.rs:123:25 [INFO] [stderr] | [INFO] [stderr] 123 | fn solve(&mut self, board: &mut Board) -> Result<(), ()> { [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_board` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `column` [INFO] [stderr] --> src/coords.rs:119:28 [INFO] [stderr] | [INFO] [stderr] 119 | pub fn to_dense(&self, column: &SparseColumn) -> DenseRow { [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_column` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `dense_row_index` [INFO] [stderr] --> src/coords.rs:276:17 [INFO] [stderr] | [INFO] [stderr] 276 | for dense_row_index in 0..9*9*9 { [INFO] [stderr] | ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_dense_row_index` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/board.rs:211:13 [INFO] [stderr] | [INFO] [stderr] 211 | let i = col + row * 9; [INFO] [stderr] | ^ help: consider prefixing with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:65:13 [INFO] [stderr] | [INFO] [stderr] 65 | let mut matrix = [[Link::default(); NONZERO_CONSTRAINTS_PER_POSSIBILITY]; POSSIBILITIES]; [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_mut)] on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:66:13 [INFO] [stderr] | [INFO] [stderr] 66 | let mut headers = [Header::default(); CONSTRAINTS]; [INFO] [stderr] | ----^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib.rs:114:9 [INFO] [stderr] | [INFO] [stderr] 114 | let mut constraint: &mut Link = &mut row[dense_column_index]; [INFO] [stderr] | ----^^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: method is never used: `to_sparse` [INFO] [stderr] --> src/coords.rs:18:5 [INFO] [stderr] | [INFO] [stderr] 18 | pub fn to_sparse(&self) -> SparseRow { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `POSSIBILITIES` [INFO] [stderr] --> src/matrix.rs:5:1 [INFO] [stderr] | [INFO] [stderr] 5 | const POSSIBILITIES: usize = 9 * 9 * 9; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `CONSTRAINTS` [INFO] [stderr] --> src/matrix.rs:9:1 [INFO] [stderr] | [INFO] [stderr] 9 | const CONSTRAINTS: usize = 9 * 9 + 9 * 9 + 9 * 9 + 9 * 9; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `NONZERO_CONSTRAINTS_PER_POSSIBILITY` [INFO] [stderr] --> src/matrix.rs:13:1 [INFO] [stderr] | [INFO] [stderr] 13 | const NONZERO_CONSTRAINTS_PER_POSSIBILITY: usize = 4; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: constant item is never used: `MATRIX_NODE_COUNT` [INFO] [stderr] --> src/matrix.rs:16:1 [INFO] [stderr] | [INFO] [stderr] 16 | const MATRIX_NODE_COUNT: usize = 1 + CONSTRAINTS + POSSIBILITIES * NONZERO_CONSTRAINTS_PER_POSSIBILITY; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/matrix.rs:359:13 [INFO] [stderr] | [INFO] [stderr] 359 | writeln!(f, "col {:?}", self.nodes[current_header_index]); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:84:13 [INFO] [stderr] | [INFO] [stderr] 84 | write!(to, "{} ", c); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:86:9 [INFO] [stderr] | [INFO] [stderr] 86 | write!(to, "{}", self.entries[9*9-1]); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: comparison is useless due to type limits [INFO] [stderr] --> src/board.rs:158:25 [INFO] [stderr] | [INFO] [stderr] 158 | assert!(value >= 0 && value <= 9); [INFO] [stderr] | ^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_comparisons)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/board.rs:202:13 [INFO] [stderr] | [INFO] [stderr] 202 | fmt_row(self, f, &mut buf, row); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/bin/sudoku.rs:15:12 [INFO] [stderr] | [INFO] [stderr] 15 | if (bytes_read == 0) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/bin/sudoku.rs:15:12 [INFO] [stderr] | [INFO] [stderr] 15 | if (bytes_read == 0) { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused return value of `core::str::::trim` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | line.trim(); [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this returns the trimmed string as a slice, without modifying the original [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:29:13 [INFO] [stderr] | [INFO] [stderr] 29 | writeln!(stdout_lock); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:30:13 [INFO] [stderr] | [INFO] [stderr] 30 | stdout_lock.flush(); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused return value of `core::str::::trim` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | line.trim(); [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this returns the trimmed string as a slice, without modifying the original [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:29:13 [INFO] [stderr] | [INFO] [stderr] 29 | writeln!(stdout_lock); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/bin/sudoku.rs:30:13 [INFO] [stderr] | [INFO] [stderr] 30 | stdout_lock.flush(); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.46s [INFO] running `"docker" "inspect" "70a081dc0e8d9841b76b6ef05e69dd313ee14d8f5c03c55e15dce3b4ebb1d8d9"` [INFO] running `"docker" "rm" "-f" "70a081dc0e8d9841b76b6ef05e69dd313ee14d8f5c03c55e15dce3b4ebb1d8d9"` [INFO] [stdout] 70a081dc0e8d9841b76b6ef05e69dd313ee14d8f5c03c55e15dce3b4ebb1d8d9