[INFO] cloning repository https://github.com/takus69/ahc031
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/takus69/ahc031" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakus69%2Fahc031", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakus69%2Fahc031'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8bb9d256056c88f8e01ebb3586f90cdcd2ab671d
[INFO] checking takus69/ahc031 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakus69%2Fahc031" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/takus69/ahc031
[INFO] finished tweaking git repo https://github.com/takus69/ahc031
[INFO] tweaked toml for git repo https://github.com/takus69/ahc031 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/takus69/ahc031 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/takus69/ahc031 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" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking takus69/ahc031 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakus69%2Fahc031" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/takus69/ahc031
[INFO] finished tweaking git repo https://github.com/takus69/ahc031
[INFO] tweaked toml for git repo https://github.com/takus69/ahc031 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/takus69/ahc031 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/takus69/ahc031 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" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proconio v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 95cc843a96ab200f8bfa85dd2c07981fb97d60fde4a73719ac213838410c42a2
[INFO] running `Command { std: "docker" "start" "-a" "95cc843a96ab200f8bfa85dd2c07981fb97d60fde4a73719ac213838410c42a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "95cc843a96ab200f8bfa85dd2c07981fb97d60fde4a73719ac213838410c42a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "95cc843a96ab200f8bfa85dd2c07981fb97d60fde4a73719ac213838410c42a2", kill_on_drop: false }`
[INFO] [stdout] 95cc843a96ab200f8bfa85dd2c07981fb97d60fde4a73719ac213838410c42a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5de83439dff33e7a188fe3b9348f928dc731a661a1664d06881b256e60b2a7d8
[INFO] running `Command { std: "docker" "start" "-a" "5de83439dff33e7a188fe3b9348f928dc731a661a1664d06881b256e60b2a7d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]     Checking proconio v0.4.5
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking ahc031 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/bin/sample05.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/bin/sample03.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `a` is never read
[INFO] [stdout]  --> src/bin/sample01.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Input {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     a: Vec<Vec<usize>>,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `a` is never read
[INFO] [stdout]  --> src/bin/sample01.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Input {
[INFO] [stdout]   |        ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 7 |     a: Vec<Vec<usize>>,
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/main.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/main.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/main.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/main.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/main.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/main.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/main.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/main.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/main.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/main.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/main.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/main.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/main.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/main.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/main.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/sample05.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/bin/sample05.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/bin/sample05.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample05.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/bin/sample05.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample05.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/bin/sample05.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/bin/sample03.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/sample05.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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/bin/sample05.rs:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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/bin/sample05.rs:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/bin/sample05.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/bin/sample05.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng`, `SeedableRng`, and `rngs::StdRng`
[INFO] [stdout]  --> src/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::{Rng, SeedableRng, rngs::StdRng};
[INFO] [stdout]   |            ^^^  ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `candidate_adjacent` is assigned to, but never used
[INFO] [stdout]    --> src/bin/sample04.rs:242:25
[INFO] [stdout]     |
[INFO] [stdout] 242 |                 let mut candidate_adjacent = 0;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_candidate_adjacent` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/sample03.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/bin/sample03.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/bin/sample03.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `candidate_adjacent` is assigned to, but never used
[INFO] [stdout]    --> src/bin/sample04.rs:242:25
[INFO] [stdout]     |
[INFO] [stdout] 242 |                 let mut candidate_adjacent = 0;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_candidate_adjacent` instead
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample03.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/bin/sample03.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample03.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/sample05.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/bin/sample05.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/bin/sample05.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/sample03.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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/bin/sample03.rs:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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/bin/sample03.rs:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/bin/sample05.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/bin/sample05.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/bin/sample03.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/bin/sample03.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `check_zero` is never used
[INFO] [stdout]    --> src/bin/sample03.rs:718:8
[INFO] [stdout]     |
[INFO] [stdout] 566 | impl Solver {
[INFO] [stdout]     | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 718 |     fn check_zero(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample05.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/bin/sample05.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample05.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/sample05.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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/bin/sample05.rs:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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/bin/sample05.rs:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/bin/sample03.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/bin/sample03.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/bin/sample03.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/bin/sample03.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/bin/sample03.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/bin/sample05.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/bin/sample05.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample03.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/bin/sample03.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/bin/sample03.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/sample03.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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/bin/sample03.rs:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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/bin/sample03.rs:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/bin/sample03.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/bin/sample03.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `check_zero` is never used
[INFO] [stdout]    --> src/bin/sample03.rs:718:8
[INFO] [stdout]     |
[INFO] [stdout] 566 | impl Solver {
[INFO] [stdout]     | ----------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 718 |     fn check_zero(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/main.rs:372:21
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                     ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `j`
[INFO] [stdout]    --> src/main.rs:372:31
[INFO] [stdout]     |
[INFO] [stdout] 372 |     fn stack(&self, i: usize, j: usize, w: usize, a: &Vec<(usize, usize)>) -> Vec<(usize, usize, i64, usize, usize)> {
[INFO] [stdout]     |                               ^ help: if this is intentional, prefix it with an underscore: `_j`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h`
[INFO] [stdout]    --> src/main.rs:422:26
[INFO] [stdout]     |
[INFO] [stdout] 422 |         for (h, a, _, k, min_h) in data {
[INFO] [stdout]     |                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b1`
[INFO] [stdout]    --> src/main.rs:482:22
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_b1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c1`
[INFO] [stdout]    --> src/main.rs:482:26
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_c1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k1`
[INFO] [stdout]    --> src/main.rs:482:30
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_k1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h1`
[INFO] [stdout]    --> src/main.rs:482:34
[INFO] [stdout]     |
[INFO] [stdout] 482 |         for (i, (h1, b1, c1, k1, min_h1)) in data1.iter().enumerate() {
[INFO] [stdout]     |                                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b2`
[INFO] [stdout]    --> src/main.rs:484:26
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                          ^^ help: if this is intentional, prefix it with an underscore: `_b2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c2`
[INFO] [stdout]    --> src/main.rs:484:30
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                              ^^ help: if this is intentional, prefix it with an underscore: `_c2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `k2`
[INFO] [stdout]    --> src/main.rs:484:34
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                  ^^ help: if this is intentional, prefix it with an underscore: `_k2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `min_h2`
[INFO] [stdout]    --> src/main.rs:484:38
[INFO] [stdout]     |
[INFO] [stdout] 484 |             for (j, (h2, b2, c2, k2, min_h2)) in data2.iter().enumerate() {
[INFO] [stdout]     |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_min_h2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/main.rs:646:17
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[INFO] [stdout]     |                 ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `optimal_cost`
[INFO] [stdout]    --> src/main.rs:668:17
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[INFO] [stdout]     |                 ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_optimal_cost`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ar`
[INFO] [stdout]    --> src/main.rs:670:21
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                     ^^ help: if this is intentional, prefix it with an underscore: `_ar`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:646:13
[INFO] [stdout]     |
[INFO] [stdout] 646 |         let mut ar = Arrangement::new(self.w, self.n);
[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:668:13
[INFO] [stdout]     |
[INFO] [stdout] 668 |         let mut optimal_cost = self.solution.cost();
[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:670:17
[INFO] [stdout]     |
[INFO] [stdout] 670 |             let mut ar = self.solution.arrangements[d].clone();
[INFO] [stdout]     |                 ----^^
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/main.rs:74:8
[INFO] [stdout]     |
[INFO] [stdout]  30 | impl Room {
[INFO] [stdout]     | --------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  74 |     fn cost(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  78 |     fn overlap_partition(&self, other: &Room) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn add_coordinate(&self, x: usize, d: i64) -> usize {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn expand(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |     fn shrink(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn shift(&self, d: char) -> Room {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 222 |     fn candidates(&self) -> Vec<(usize, Room)> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `init`, `optimize`, and `overlap` are never used
[INFO] [stdout]    --> src/main.rs:280:8
[INFO] [stdout]     |
[INFO] [stdout] 274 | impl Arrangement {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 280 |     fn init(&mut self, a: Vec<usize>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 291 |     fn optimize(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 362 |     fn overlap(&self, ar: &Arrangement) -> usize {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.13s
[INFO] running `Command { std: "docker" "inspect" "5de83439dff33e7a188fe3b9348f928dc731a661a1664d06881b256e60b2a7d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5de83439dff33e7a188fe3b9348f928dc731a661a1664d06881b256e60b2a7d8", kill_on_drop: false }`
[INFO] [stdout] 5de83439dff33e7a188fe3b9348f928dc731a661a1664d06881b256e60b2a7d8