[INFO] cloning repository https://github.com/michabay05/nqueens
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/michabay05/nqueens" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichabay05%2Fnqueens", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichabay05%2Fnqueens'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a0d970704503fc129a76f91189a13e6c3a47e31f
[INFO] testing michabay05/nqueens against beta-2026-04-21 for beta-1.96-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmichabay05%2Fnqueens" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/michabay05/nqueens
[INFO] finished tweaking git repo https://github.com/michabay05/nqueens
[INFO] tweaked toml for git repo https://github.com/michabay05/nqueens written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/michabay05/nqueens on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/michabay05/nqueens 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e9dd7a9677d22d77b9caa39820e70ba5deb9fbf15704977451d379c6d0579ad1
[INFO] running `Command { std: "docker" "start" "-a" "e9dd7a9677d22d77b9caa39820e70ba5deb9fbf15704977451d379c6d0579ad1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e9dd7a9677d22d77b9caa39820e70ba5deb9fbf15704977451d379c6d0579ad1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9dd7a9677d22d77b9caa39820e70ba5deb9fbf15704977451d379c6d0579ad1", kill_on_drop: false }`
[INFO] [stdout] e9dd7a9677d22d77b9caa39820e70ba5deb9fbf15704977451d379c6d0579ad1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 254dafef9d0f3eb6d787a0fdde28434bfed74ca830284b396671978bb09f7dad
[INFO] running `Command { std: "docker" "start" "-a" "254dafef9d0f3eb6d787a0fdde28434bfed74ca830284b396671978bb09f7dad", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling nqueens v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `r` is never read
[INFO] [stdout]   --> src/attack.rs:44:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut r: i8 = start_row;
[INFO] [stdout]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 48 |     r = start_row + 1;
[INFO] [stdout]    |     ----------------- `r` 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: value assigned to `c` is never read
[INFO] [stdout]   --> src/attack.rs:45:21
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let mut c: i8 = start_col;
[INFO] [stdout]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 49 |     c = start_col + 1;
[INFO] [stdout]    |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `r` is never read
[INFO] [stdout]    --> src/attack.rs:101:21
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let mut r: i8 = start_row;
[INFO] [stdout]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 105 |     r = start_row + 1;
[INFO] [stdout]     |     ----------------- `r` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `c` is never read
[INFO] [stdout]    --> src/attack.rs:102:21
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let mut c: i8 = start_col;
[INFO] [stdout]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 121 |     c = start_col + 1;
[INFO] [stdout]     |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/population.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         for i in 0..POPULATION_COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `el`
[INFO] [stdout]    --> src/population.rs:198:17
[INFO] [stdout]     |
[INFO] [stdout] 198 |         for (i, el) in self.elements.iter().enumerate() {
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_el`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `randomized_new` and `print_genes` are never used
[INFO] [stdout]   --> src/dna.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl DNA {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn randomized_new() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn print_genes(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mutate_rate` is never read
[INFO] [stdout]   --> src/population.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | pub struct Population {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 15 |     mutate_rate: f32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `print_mating_pool`, `print_mating_pool_count`, `print_elements`, and `print_fitness` are never used
[INFO] [stdout]    --> src/population.rs:191:12
[INFO] [stdout]     |
[INFO] [stdout]  31 | impl Population {
[INFO] [stdout]     | --------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 191 |     pub fn print_mating_pool(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 196 |     pub fn print_mating_pool_count(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 208 |     pub fn print_elements(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 214 |     pub fn print_fitness(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.68s
[INFO] running `Command { std: "docker" "inspect" "254dafef9d0f3eb6d787a0fdde28434bfed74ca830284b396671978bb09f7dad", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "254dafef9d0f3eb6d787a0fdde28434bfed74ca830284b396671978bb09f7dad", kill_on_drop: false }`
[INFO] [stdout] 254dafef9d0f3eb6d787a0fdde28434bfed74ca830284b396671978bb09f7dad
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] be299aa3b8bbf71705823719a9b71d240e603d3a0e81e37fd72d76353945829c
[INFO] running `Command { std: "docker" "start" "-a" "be299aa3b8bbf71705823719a9b71d240e603d3a0e81e37fd72d76353945829c", kill_on_drop: false }`
[INFO] [stderr]    Compiling nqueens v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `r` is never read
[INFO] [stdout]   --> src/attack.rs:44:21
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let mut r: i8 = start_row;
[INFO] [stdout]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 48 |     r = start_row + 1;
[INFO] [stdout]    |     ----------------- `r` 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: value assigned to `c` is never read
[INFO] [stdout]   --> src/attack.rs:45:21
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let mut c: i8 = start_col;
[INFO] [stdout]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 49 |     c = start_col + 1;
[INFO] [stdout]    |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `r` is never read
[INFO] [stdout]    --> src/attack.rs:101:21
[INFO] [stdout]     |
[INFO] [stdout] 101 |     let mut r: i8 = start_row;
[INFO] [stdout]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 105 |     r = start_row + 1;
[INFO] [stdout]     |     ----------------- `r` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `c` is never read
[INFO] [stdout]    --> src/attack.rs:102:21
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let mut c: i8 = start_col;
[INFO] [stdout]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 121 |     c = start_col + 1;
[INFO] [stdout]     |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]   --> src/population.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |         for i in 0..POPULATION_COUNT {
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `el`
[INFO] [stdout]    --> src/population.rs:198:17
[INFO] [stdout]     |
[INFO] [stdout] 198 |         for (i, el) in self.elements.iter().enumerate() {
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_el`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `randomized_new` and `print_genes` are never used
[INFO] [stdout]   --> src/dna.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 14 | impl DNA {
[INFO] [stdout]    | -------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 25 |     pub fn randomized_new() -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn print_genes(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `mutate_rate` is never read
[INFO] [stdout]   --> src/population.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout]  9 | pub struct Population {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 15 |     mutate_rate: f32,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `print_mating_pool`, `print_mating_pool_count`, `print_elements`, and `print_fitness` are never used
[INFO] [stdout]    --> src/population.rs:191:12
[INFO] [stdout]     |
[INFO] [stdout]  31 | impl Population {
[INFO] [stdout]     | --------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 191 |     pub fn print_mating_pool(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 196 |     pub fn print_mating_pool_count(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 208 |     pub fn print_elements(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 214 |     pub fn print_fitness(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `Command { std: "docker" "inspect" "be299aa3b8bbf71705823719a9b71d240e603d3a0e81e37fd72d76353945829c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be299aa3b8bbf71705823719a9b71d240e603d3a0e81e37fd72d76353945829c", kill_on_drop: false }`
[INFO] [stdout] be299aa3b8bbf71705823719a9b71d240e603d3a0e81e37fd72d76353945829c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,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" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 880d7ff316ed8b8e15909221e782b772a79bab02cef19163bda84ec19fa68684
[INFO] running `Command { std: "docker" "start" "-a" "880d7ff316ed8b8e15909221e782b772a79bab02cef19163bda84ec19fa68684", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `r` is never read
[INFO] [stderr]   --> src/attack.rs:44:21
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let mut r: i8 = start_row;
[INFO] [stderr]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 48 |     r = start_row + 1;
[INFO] [stderr]    |     ----------------- `r` 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: value assigned to `c` is never read
[INFO] [stderr]   --> src/attack.rs:45:21
[INFO] [stderr]    |
[INFO] [stderr] 45 |     let mut c: i8 = start_col;
[INFO] [stderr]    |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 49 |     c = start_col + 1;
[INFO] [stderr]    |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `r` is never read
[INFO] [stderr]    --> src/attack.rs:101:21
[INFO] [stderr]     |
[INFO] [stderr] 101 |     let mut r: i8 = start_row;
[INFO] [stderr]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 105 |     r = start_row + 1;
[INFO] [stderr]     |     ----------------- `r` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `c` is never read
[INFO] [stderr]    --> src/attack.rs:102:21
[INFO] [stderr]     |
[INFO] [stderr] 102 |     let mut c: i8 = start_col;
[INFO] [stderr]     |                     ^^^^^^^^^ this value is reassigned later and never used
[INFO] [stderr] ...
[INFO] [stderr] 121 |     c = start_col + 1;
[INFO] [stderr]     |     ----------------- `c` is overwritten here before the previous value is read
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]   --> src/population.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |         for i in 0..POPULATION_COUNT {
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `el`
[INFO] [stderr]    --> src/population.rs:198:17
[INFO] [stderr]     |
[INFO] [stderr] 198 |         for (i, el) in self.elements.iter().enumerate() {
[INFO] [stderr]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_el`
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `randomized_new` and `print_genes` are never used
[INFO] [stderr]   --> src/dna.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 14 | impl DNA {
[INFO] [stderr]    | -------- associated items in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 25 |     pub fn randomized_new() -> Self {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 70 |     pub fn print_genes(&self) {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `mutate_rate` is never read
[INFO] [stderr]   --> src/population.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr]  9 | pub struct Population {
[INFO] [stderr]    |            ---------- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 15 |     mutate_rate: f32,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `print_mating_pool`, `print_mating_pool_count`, `print_elements`, and `print_fitness` are never used
[INFO] [stderr]    --> src/population.rs:191:12
[INFO] [stderr]     |
[INFO] [stderr]  31 | impl Population {
[INFO] [stderr]     | --------------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 191 |     pub fn print_mating_pool(&self) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 196 |     pub fn print_mating_pool_count(&self) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 208 |     pub fn print_elements(&self) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 214 |     pub fn print_fitness(&self) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `nqueens` (bin "nqueens" test) generated 9 warnings (run `cargo fix --bin "nqueens" -p nqueens --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/nqueens-d0436e67e0ecad97)
[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" "880d7ff316ed8b8e15909221e782b772a79bab02cef19163bda84ec19fa68684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "880d7ff316ed8b8e15909221e782b772a79bab02cef19163bda84ec19fa68684", kill_on_drop: false }`
[INFO] [stdout] 880d7ff316ed8b8e15909221e782b772a79bab02cef19163bda84ec19fa68684
