[INFO] cloning repository https://github.com/m-squared96/sudoku-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/m-squared96/sudoku-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-squared96%2Fsudoku-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-squared96%2Fsudoku-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4360ead5e4fef6703cf47734ccd01c25220c75a1
[INFO] testing m-squared96/sudoku-solver against 1.99.0-beta.1+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fm-squared96%2Fsudoku-solver" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/m-squared96/sudoku-solver
[INFO] finished tweaking git repo https://github.com/m-squared96/sudoku-solver
[INFO] tweaked toml for git repo https://github.com/m-squared96/sudoku-solver written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/m-squared96/sudoku-solver on toolchain 1.99.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/m-squared96/sudoku-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea
[INFO] running `Command { std: "docker" "start" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling sudoku_solver_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `filepath` is never read
[INFO] [stdout]    --> src/main.rs:377:40
[INFO] [stdout]     |
[INFO] [stdout] 377 |     let mut filepath: Option<String> = Some(String::new());
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 390 |         filepath = Some(String::from(&args[2]));
[INFO] [stdout]     |         -------- `filepath` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:464:9
[INFO] [stdout]     |
[INFO] [stdout] 464 |     let mut output_file = fs::File::create(filepath.as_str()).unwrap();
[INFO] [stdout]     |         ----^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `command_flag` is never read
[INFO] [stdout]    --> src/main.rs:535:28
[INFO] [stdout]     |
[INFO] [stdout] 535 |     let mut command_flag = String::new();
[INFO] [stdout]     |                            ^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 541 |         command_flag = String::from("no flag");
[INFO] [stdout]     |         ------------ `command_flag` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `board` is never read
[INFO] [stdout]    --> src/main.rs:544:44
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let mut board: Option<Vec<Vec<u32>>> = Some(Vec::new());
[INFO] [stdout]     |                                            ^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] 545 |     match command_flag.as_ref() {
[INFO] [stdout] 546 |         "r" => {board = Some(random_gen_handler(&args))},
[INFO] [stdout]     |                 ----- `board` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `output_puzzle` is never used
[INFO] [stdout]    --> src/main.rs:449:4
[INFO] [stdout]     |
[INFO] [stdout] 449 | fn output_puzzle(args: Vec<String>) -> Vec<Vec<u32>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:475:9
[INFO] [stdout]     |
[INFO] [stdout] 475 |         write!(&mut writer, "{}", line_string);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 475 |         let _ = write!(&mut writer, "{}", line_string);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 2.62s
[INFO] running `Command { std: "docker" "inspect" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "test" "--frozen" "--no-run" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku_solver_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `filepath` is never read
[INFO] [stdout]    --> src/main.rs:377:40
[INFO] [stdout]     |
[INFO] [stdout] 377 |     let mut filepath: Option<String> = Some(String::new());
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 390 |         filepath = Some(String::from(&args[2]));
[INFO] [stdout]     |         -------- `filepath` is overwritten here before the previous value is read
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:464:9
[INFO] [stdout]     |
[INFO] [stdout] 464 |     let mut output_file = fs::File::create(filepath.as_str()).unwrap();
[INFO] [stdout]     |         ----^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `command_flag` is never read
[INFO] [stdout]    --> src/main.rs:535:28
[INFO] [stdout]     |
[INFO] [stdout] 535 |     let mut command_flag = String::new();
[INFO] [stdout]     |                            ^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 541 |         command_flag = String::from("no flag");
[INFO] [stdout]     |         ------------ `command_flag` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `board` is never read
[INFO] [stdout]    --> src/main.rs:544:44
[INFO] [stdout]     |
[INFO] [stdout] 544 |     let mut board: Option<Vec<Vec<u32>>> = Some(Vec::new());
[INFO] [stdout]     |                                            ^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] 545 |     match command_flag.as_ref() {
[INFO] [stdout] 546 |         "r" => {board = Some(random_gen_handler(&args))},
[INFO] [stdout]     |                 ----- `board` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `output_puzzle` is never used
[INFO] [stdout]    --> src/main.rs:449:4
[INFO] [stdout]     |
[INFO] [stdout] 449 | fn output_puzzle(args: Vec<String>) -> Vec<Vec<u32>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:475:9
[INFO] [stdout]     |
[INFO] [stdout] 475 |         write!(&mut writer, "{}", line_string);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 475 |         let _ = write!(&mut writer, "{}", line_string);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "test" "--frozen" "--release", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `filepath` is never read
[INFO] [stderr]    --> src/main.rs:377:40
[INFO] [stderr]     |
[INFO] [stderr] 377 |     let mut filepath: Option<String> = Some(String::new());
[INFO] [stderr]     |                                        ^^^^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 390 |         filepath = Some(String::from(&args[2]));
[INFO] [stderr]     |         -------- `filepath` is overwritten here before the previous value is read
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:464:9
[INFO] [stderr]     |
[INFO] [stderr] 464 |     let mut output_file = fs::File::create(filepath.as_str()).unwrap();
[INFO] [stderr]     |         ----^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `command_flag` is never read
[INFO] [stderr]    --> src/main.rs:535:28
[INFO] [stderr]     |
[INFO] [stderr] 535 |     let mut command_flag = String::new();
[INFO] [stderr]     |                            ^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 541 |         command_flag = String::from("no flag");
[INFO] [stderr]     |         ------------ `command_flag` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `board` is never read
[INFO] [stderr]    --> src/main.rs:544:44
[INFO] [stderr]     |
[INFO] [stderr] 544 |     let mut board: Option<Vec<Vec<u32>>> = Some(Vec::new());
[INFO] [stderr]     |                                            ^^^^^^^^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] 545 |     match command_flag.as_ref() {
[INFO] [stderr] 546 |         "r" => {board = Some(random_gen_handler(&args))},
[INFO] [stderr]     |                 ----- `board` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: function `output_puzzle` is never used
[INFO] [stderr]    --> src/main.rs:449:4
[INFO] [stderr]     |
[INFO] [stderr] 449 | fn output_puzzle(args: Vec<String>) -> Vec<Vec<u32>> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:475:9
[INFO] [stderr]     |
[INFO] [stderr] 475 |         write!(&mut writer, "{}", line_string);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 475 |         let _ = write!(&mut writer, "{}", line_string);
[INFO] [stderr]     |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `sudoku_solver_rust` (bin "sudoku_solver_rust" test) generated 6 warnings (run `cargo fix --bin "sudoku_solver_rust" -p sudoku_solver_rust --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `release` profile [optimized] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/release/deps/sudoku_solver_rust-766ca81e26cb65a1)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea", kill_on_drop: false }`
[INFO] [stdout] 573e522c178353aef28058b2877691cc19c282071efc0acba13070c67e87afea
