[INFO] updating cached repository https://github.com/lampij/Rustbik [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }` [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] efd41746fa1c7878ec5cdbbfeaa0cb2b67ffd311 [INFO] testing lampij/Rustbik against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flampij%2FRustbik" "/workspace/builds/worker-1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/lampij/Rustbik on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/lampij/Rustbik [INFO] finished tweaking git repo https://github.com/lampij/Rustbik [INFO] tweaked toml for git repo https://github.com/lampij/Rustbik written to /workspace/builds/worker-1/source/Cargo.toml [INFO] crate git repo https://github.com/lampij/Rustbik already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 529fc5c1b5aaa4c8f078a7bbb6f881e4e6bf954dbe05b49bfc78136865527677 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "529fc5c1b5aaa4c8f078a7bbb6f881e4e6bf954dbe05b49bfc78136865527677", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "529fc5c1b5aaa4c8f078a7bbb6f881e4e6bf954dbe05b49bfc78136865527677", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "529fc5c1b5aaa4c8f078a7bbb6f881e4e6bf954dbe05b49bfc78136865527677", kill_on_drop: false }` [INFO] [stdout] 529fc5c1b5aaa4c8f078a7bbb6f881e4e6bf954dbe05b49bfc78136865527677 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 8b2ec22950dfb024c2c1e9117cb815b569478c729eccb76f5ec810a4905ab273 [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "8b2ec22950dfb024c2c1e9117cb815b569478c729eccb76f5ec810a4905ab273", kill_on_drop: false }` [INFO] [stderr] Compiling getrandom v0.1.12 [INFO] [stderr] Compiling ppv-lite86 v0.2.5 [INFO] [stderr] Compiling termcolor v1.0.5 [INFO] [stderr] Compiling c2-chacha v0.2.2 [INFO] [stderr] Compiling rand_core v0.5.1 [INFO] [stderr] Compiling rand_chacha v0.2.1 [INFO] [stderr] Compiling rand v0.7.2 [INFO] [stderr] Compiling rustbik v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `total` [INFO] [stdout] --> src/main.rs:110:13 [INFO] [stdout] | [INFO] [stdout] 110 | let mut total : f64 = 0.00; [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_total` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:91:35 [INFO] [stdout] | [INFO] [stdout] 91 | pub fn solve_best_simple_move(mut c: Cube) -> Cube{ [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:110:13 [INFO] [stdout] | [INFO] [stdout] 110 | let mut total : f64 = 0.00; [INFO] [stdout] | ----^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 8.03s [INFO] running `Command { std: "docker" "inspect" "8b2ec22950dfb024c2c1e9117cb815b569478c729eccb76f5ec810a4905ab273", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8b2ec22950dfb024c2c1e9117cb815b569478c729eccb76f5ec810a4905ab273", kill_on_drop: false }` [INFO] [stdout] 8b2ec22950dfb024c2c1e9117cb815b569478c729eccb76f5ec810a4905ab273 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 476b9a1b8090cef64ffb3df1b0df5cb4cbd202e2e7635456401b3482f45722ed [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "476b9a1b8090cef64ffb3df1b0df5cb4cbd202e2e7635456401b3482f45722ed", kill_on_drop: false }` [INFO] [stderr] Compiling rustbik v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `total` [INFO] [stdout] --> src/main.rs:110:13 [INFO] [stdout] | [INFO] [stdout] 110 | let mut total : f64 = 0.00; [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_total` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:530:17 [INFO] [stdout] | [INFO] [stdout] 530 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:571:17 [INFO] [stdout] | [INFO] [stdout] 571 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:625:17 [INFO] [stdout] | [INFO] [stdout] 625 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:679:17 [INFO] [stdout] | [INFO] [stdout] 679 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:733:17 [INFO] [stdout] | [INFO] [stdout] 733 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:787:17 [INFO] [stdout] | [INFO] [stdout] 787 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:841:17 [INFO] [stdout] | [INFO] [stdout] 841 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:895:17 [INFO] [stdout] | [INFO] [stdout] 895 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/main.rs:905:17 [INFO] [stdout] | [INFO] [stdout] 905 | let n = test::black_box(&test_cube); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:907:17 [INFO] [stdout] | [INFO] [stdout] 907 | for i in 1..1000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sort_val` [INFO] [stdout] --> src/main.rs:908:21 [INFO] [stdout] | [INFO] [stdout] 908 | let sort_val = Cube::is_side_sorted(&test_cube.front); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sort_val` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/main.rs:917:17 [INFO] [stdout] | [INFO] [stdout] 917 | let n = test::black_box(&test_cube); [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `i` [INFO] [stdout] --> src/main.rs:919:17 [INFO] [stdout] | [INFO] [stdout] 919 | for i in 1..100000000 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `sort_val` [INFO] [stdout] --> src/main.rs:920:21 [INFO] [stdout] | [INFO] [stdout] 920 | let sort_val = Cube::swap_unit_colors(&mut test_cube.front.top_right, &mut test_cube.back.top_left); [INFO] [stdout] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sort_val` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:91:35 [INFO] [stdout] | [INFO] [stdout] 91 | pub fn solve_best_simple_move(mut c: Cube) -> Cube{ [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:110:13 [INFO] [stdout] | [INFO] [stdout] 110 | let mut total : f64 = 0.00; [INFO] [stdout] | ----^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:903:13 [INFO] [stdout] | [INFO] [stdout] 903 | let mut test_cube = Cube::new(); [INFO] [stdout] | ----^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 18 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.20s [INFO] running `Command { std: "docker" "inspect" "476b9a1b8090cef64ffb3df1b0df5cb4cbd202e2e7635456401b3482f45722ed", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "476b9a1b8090cef64ffb3df1b0df5cb4cbd202e2e7635456401b3482f45722ed", kill_on_drop: false }` [INFO] [stdout] 476b9a1b8090cef64ffb3df1b0df5cb4cbd202e2e7635456401b3482f45722ed [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-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@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "test" "--frozen", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] ba3fe8018c08bdfbdc3cb75b9a07dfde69020803b398b3a9d95aa026a9da7179 [INFO] running `Command { std: "docker" "start" "-a" "ba3fe8018c08bdfbdc3cb75b9a07dfde69020803b398b3a9d95aa026a9da7179", kill_on_drop: false }` [INFO] [stderr] warning: unused variable: `total` [INFO] [stderr] --> src/main.rs:110:13 [INFO] [stderr] | [INFO] [stderr] 110 | let mut total : f64 = 0.00; [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_total` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:530:17 [INFO] [stderr] | [INFO] [stderr] 530 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:571:17 [INFO] [stderr] | [INFO] [stderr] 571 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:625:17 [INFO] [stderr] | [INFO] [stderr] 625 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:679:17 [INFO] [stderr] | [INFO] [stderr] 679 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:733:17 [INFO] [stderr] | [INFO] [stderr] 733 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:787:17 [INFO] [stderr] | [INFO] [stderr] 787 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:841:17 [INFO] [stderr] | [INFO] [stderr] 841 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:895:17 [INFO] [stderr] | [INFO] [stderr] 895 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `n` [INFO] [stderr] --> src/main.rs:905:17 [INFO] [stderr] | [INFO] [stderr] 905 | let n = test::black_box(&test_cube); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:907:17 [INFO] [stderr] | [INFO] [stderr] 907 | for i in 1..1000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sort_val` [INFO] [stderr] --> src/main.rs:908:21 [INFO] [stderr] | [INFO] [stderr] 908 | let sort_val = Cube::is_side_sorted(&test_cube.front); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sort_val` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `n` [INFO] [stderr] --> src/main.rs:917:17 [INFO] [stderr] | [INFO] [stderr] 917 | let n = test::black_box(&test_cube); [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `i` [INFO] [stderr] --> src/main.rs:919:17 [INFO] [stderr] | [INFO] [stderr] 919 | for i in 1..100000000 { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_i` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `sort_val` [INFO] [stderr] --> src/main.rs:920:21 [INFO] [stderr] | [INFO] [stderr] 920 | let sort_val = Cube::swap_unit_colors(&mut test_cube.front.top_right, &mut test_cube.back.top_left); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sort_val` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:91:35 [INFO] [stderr] | [INFO] [stderr] 91 | pub fn solve_best_simple_move(mut c: Cube) -> Cube{ [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/main.rs:110:13 [INFO] [stderr] | [INFO] [stderr] 110 | let mut total : f64 = 0.00; [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/main.rs:903:13 [INFO] [stderr] | [INFO] [stderr] 903 | let mut test_cube = Cube::new(); [INFO] [stderr] | ----^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: 18 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running /opt/rustwide/target/debug/deps/rustbik-018c7ff226182514 [INFO] [stdout] [INFO] [stdout] running 18 tests [INFO] [stdout] test tests::back_clockwise ... ok [INFO] [stdout] test tests::right_clockwise ... ok [INFO] [stdout] test tests::top_clockwise_turn ... ok [INFO] [stdout] test tests::front_clockwise ... ok [INFO] [stdout] test tests::left_counterclockwise ... ok [INFO] [stdout] test tests::bottom_clockwise ... ok [INFO] [stdout] test tests::clockwise_turn ... ok [INFO] [stdout] test tests::counterclockwise_turn ... ok [INFO] [stdout] test tests::bench_side_sorted_1m ... ok [INFO] [stdout] test tests::bench_counterclockwise_turn_1m ... ok [INFO] [stdout] test tests::bench_clockwise_turn_1m ... ok [INFO] [stdout] test tests::bench_top_clockwise_turn_1m ... ok [INFO] [stdout] test tests::bench_back_clockwise_1m ... ok [INFO] [stdout] test tests::bench_right_clockwise_1m ... ok [INFO] [stdout] test tests::bench_left_counterclockwise_1m ... ok [INFO] [stdout] test tests::bench_front_clockwise_1m ... ok [INFO] [stdout] test tests::bench_bottom_clockwise_1m ... ok [INFO] [stdout] test tests::bench_unit_swap_100m ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 18 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] running `Command { std: "docker" "inspect" "ba3fe8018c08bdfbdc3cb75b9a07dfde69020803b398b3a9d95aa026a9da7179", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "ba3fe8018c08bdfbdc3cb75b9a07dfde69020803b398b3a9d95aa026a9da7179", kill_on_drop: false }` [INFO] [stdout] ba3fe8018c08bdfbdc3cb75b9a07dfde69020803b398b3a9d95aa026a9da7179