[INFO] updating cached repository https://github.com/dakitten2358/rust_sudoku
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a099d400896428bcc995a0f85ef1b77e3d32f4e4
[INFO] checking dakitten2358/rust_sudoku against master#4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb for pr-64672
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdakitten2358%2Frust_sudoku" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dakitten2358/rust_sudoku on toolchain 4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/dakitten2358/rust_sudoku
[INFO] finished tweaking git repo https://github.com/dakitten2358/rust_sudoku
[INFO] tweaked toml for git repo https://github.com/dakitten2358/rust_sudoku written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/dakitten2358/rust_sudoku already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2e9d018193bb1fa97e68eccef5ba6bbee077ee7e7840b700828feb6ae971bc7e
[INFO] running `"docker" "start" "-a" "2e9d018193bb1fa97e68eccef5ba6bbee077ee7e7840b700828feb6ae971bc7e"`
[INFO] [stderr]    Compiling libc v0.2.26
[INFO] [stderr]    Compiling xml-rs v0.6.0
[INFO] [stderr]     Checking shared_library v0.1.6
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking deflate v0.7.13
[INFO] [stderr]    Compiling wayland-scanner v0.8.7
[INFO] [stderr]     Checking pistoncore-input v0.18.0
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]     Checking num-rational v0.1.38
[INFO] [stderr]     Checking x11-dl v2.14.0
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]     Checking fs2 v0.2.5
[INFO] [stderr]     Checking tempfile v2.1.5
[INFO] [stderr]     Checking osmesa-sys v0.1.2
[INFO] [stderr]     Checking png v0.8.0
[INFO] [stderr]    Compiling gl_generator v0.5.5
[INFO] [stderr]    Compiling wayland-client v0.8.7
[INFO] [stderr]     Checking memmap v0.4.0
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]     Checking pistoncore-window v0.27.0
[INFO] [stderr]     Checking image v0.14.0
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]     Checking pistoncore-event_loop v0.32.0
[INFO] [stderr]    Compiling target_build_utils v0.3.1
[INFO] [stderr]    Compiling gl v0.6.3
[INFO] [stderr]    Compiling glutin v0.8.1
[INFO] [stderr]     Checking piston v0.32.0
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.45.0
[INFO] [stderr]    Compiling libloading v0.3.4
[INFO] [stderr]     Checking dlib v0.3.1
[INFO] [stderr]     Checking wayland-sys v0.8.7
[INFO] [stderr]     Checking wayland-window v0.5.0
[INFO] [stderr]     Checking wayland-kbd v0.8.0
[INFO] [stderr]     Checking winit v0.6.4
[INFO] [stderr]     Checking pistoncore-glutin_window v0.37.0
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/gameboard.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |           /// check to see if we already have this number in the given row or column
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 61 | /         for i in 0..9 {
[INFO] [stderr] 62 | |             if (self.cells[i][ind[0]] == val) {
[INFO] [stderr] 63 | |                 return false;
[INFO] [stderr] 64 | |             }
[INFO] [stderr] ...  |
[INFO] [stderr] 67 | |             }
[INFO] [stderr] 68 | |         }
[INFO] [stderr]    | |_________- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/gameboard.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |           /// check to see if we already have this number in the given row or column
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 61 | /         for i in 0..9 {
[INFO] [stderr] 62 | |             if (self.cells[i][ind[0]] == val) {
[INFO] [stderr] 63 | |                 return false;
[INFO] [stderr] 64 | |             }
[INFO] [stderr] ...  |
[INFO] [stderr] 67 | |             }
[INFO] [stderr] 68 | |         }
[INFO] [stderr]    | |_________- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:62:16
[INFO] [stderr]    |
[INFO] [stderr] 62 |             if (self.cells[i][ind[0]] == val) {
[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/gameboard.rs:65:16
[INFO] [stderr]    |
[INFO] [stderr] 65 |             if (self.cells[ind[1]][i] == val) {
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:80:12
[INFO] [stderr]    |
[INFO] [stderr] 80 |         if (self.cells[row1 + section_row][col1 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 |         if (self.cells[row2 + section_row][col1 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:87:12
[INFO] [stderr]    |
[INFO] [stderr] 87 |         if (self.cells[row1 + section_row][col2 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:90:12
[INFO] [stderr]    |
[INFO] [stderr] 90 |         if (self.cells[row2 + section_row][col2 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:62:16
[INFO] [stderr]    |
[INFO] [stderr] 62 |             if (self.cells[i][ind[0]] == val) {
[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/gameboard.rs:65:16
[INFO] [stderr]    |
[INFO] [stderr] 65 |             if (self.cells[ind[1]][i] == val) {
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:80:12
[INFO] [stderr]    |
[INFO] [stderr] 80 |         if (self.cells[row1 + section_row][col1 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 |         if (self.cells[row2 + section_row][col1 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:87:12
[INFO] [stderr]    |
[INFO] [stderr] 87 |         if (self.cells[row1 + section_row][col2 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]   --> src/gameboard.rs:90:12
[INFO] [stderr]    |
[INFO] [stderr] 90 |         if (self.cells[row2 + section_row][col2 + section_col] == val) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 08s
[INFO] running `"docker" "inspect" "2e9d018193bb1fa97e68eccef5ba6bbee077ee7e7840b700828feb6ae971bc7e"`
[INFO] running `"docker" "rm" "-f" "2e9d018193bb1fa97e68eccef5ba6bbee077ee7e7840b700828feb6ae971bc7e"`
[INFO] [stdout] 2e9d018193bb1fa97e68eccef5ba6bbee077ee7e7840b700828feb6ae971bc7e