[INFO] cloning repository https://github.com/joshuacoles/Coursework-2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/joshuacoles/Coursework-2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacoles%2FCoursework-2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacoles%2FCoursework-2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 425716e6bb139a7fc9cec94133dd075bcdf734cd
[INFO] testing joshuacoles/Coursework-2 against 1.98.0-beta.1 for beta-1.98-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjoshuacoles%2FCoursework-2" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/joshuacoles/Coursework-2
[INFO] finished tweaking git repo https://github.com/joshuacoles/Coursework-2
[INFO] tweaked toml for git repo https://github.com/joshuacoles/Coursework-2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/joshuacoles/Coursework-2 on toolchain 1.98.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.98.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/joshuacoles/Coursework-2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.98.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa
[INFO] running `Command { std: "docker" "start" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling array2d v0.2.1
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling rand_core v0.6.2
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.8.3
[INFO] [stderr]    Compiling cw-2-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Grid` is never constructed
[INFO] [stdout]  --> src/q1a.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Grid {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_indexes_in_range` is never used
[INFO] [stdout]   --> src/q1a.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/q1a.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Grid {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 27 |     fn new(lx: usize, ly: usize, n: usize) -> Grid {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/q1a.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Grid` is never constructed
[INFO] [stdout]   --> src/q2a.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Grid {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `GridCell` is never used
[INFO] [stdout]   --> src/q2a.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum GridCell {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_indexes_in_range` is never used
[INFO] [stdout]   --> src/q2a.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `directly_reachable_from` are never used
[INFO] [stdout]   --> src/q2a.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl Grid {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 46 |     fn new(lx: usize, ly: usize, n: usize, p_super: f64) -> Grid {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn directly_reachable_from(&self, pos: (usize, usize)) -> HashSet<Pos> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Pos` is never used
[INFO] [stdout]    --> src/q2a.rs:117:6
[INFO] [stdout]     |
[INFO] [stdout] 117 | type Pos = (usize, usize);
[INFO] [stdout]     |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ClusterFinder` is never constructed
[INFO] [stdout]    --> src/q2a.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | struct ClusterFinder {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `search`, and `step` are never used
[INFO] [stdout]    --> src/q2a.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 129 | impl ClusterFinder {
[INFO] [stdout]     | ------------------ associated items in this implementation
[INFO] [stdout] 130 |     fn new(grid: Grid) -> ClusterFinder {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 145 |     fn search(&mut self) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 151 |     fn step(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/q2a.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 | pub fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cluster` is never used
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl <'a> ClusterFinder<'a> {
[INFO] [stdout]    | --------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 64 |     pub fn cluster(&self) -> &HashSet<Pos> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:19:22
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn new(grid: &Grid) -> ClusterFinder {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn new(grid: &Grid) -> ClusterFinder<'_> {
[INFO] [stdout]    |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:28:42
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder {
[INFO] [stdout]    |                                          ^^^^^                         ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                                          |
[INFO] [stdout]    |                                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder<'_> {
[INFO] [stdout]    |                                                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.31s
[INFO] running `Command { std: "docker" "inspect" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling cw-2-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Grid` is never constructed
[INFO] [stdout]  --> src/q1a.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Grid {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_indexes_in_range` is never used
[INFO] [stdout]   --> src/q1a.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/q1a.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | impl Grid {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 27 |     fn new(lx: usize, ly: usize, n: usize) -> Grid {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/q1a.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Grid` is never constructed
[INFO] [stdout]   --> src/q2a.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Grid {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `GridCell` is never used
[INFO] [stdout]   --> src/q2a.rs:15:6
[INFO] [stdout]    |
[INFO] [stdout] 15 | enum GridCell {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `random_indexes_in_range` is never used
[INFO] [stdout]   --> src/q2a.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `directly_reachable_from` are never used
[INFO] [stdout]   --> src/q2a.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl Grid {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 46 |     fn new(lx: usize, ly: usize, n: usize, p_super: f64) -> Grid {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn directly_reachable_from(&self, pos: (usize, usize)) -> HashSet<Pos> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Pos` is never used
[INFO] [stdout]    --> src/q2a.rs:117:6
[INFO] [stdout]     |
[INFO] [stdout] 117 | type Pos = (usize, usize);
[INFO] [stdout]     |      ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ClusterFinder` is never constructed
[INFO] [stdout]    --> src/q2a.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | struct ClusterFinder {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `search`, and `step` are never used
[INFO] [stdout]    --> src/q2a.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 129 | impl ClusterFinder {
[INFO] [stdout]     | ------------------ associated items in this implementation
[INFO] [stdout] 130 |     fn new(grid: Grid) -> ClusterFinder {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 145 |     fn search(&mut self) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 151 |     fn step(&mut self) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/q2a.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 | pub fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `cluster` is never used
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:64:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | impl <'a> ClusterFinder<'a> {
[INFO] [stdout]    | --------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 64 |     pub fn cluster(&self) -> &HashSet<Pos> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:19:22
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn new(grid: &Grid) -> ClusterFinder {
[INFO] [stdout]    |                      ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn new(grid: &Grid) -> ClusterFinder<'_> {
[INFO] [stdout]    |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/q2b/cluster_finder.rs:28:42
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder {
[INFO] [stdout]    |                                          ^^^^^                         ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                                          |
[INFO] [stdout]    |                                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder<'_> {
[INFO] [stdout]    |                                                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa" "/opt/rustwide/cargo-home/bin/cargo" "+1.98.0-beta.1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stderr] warning: struct `Grid` is never constructed
[INFO] [stderr]  --> src/q1a.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Grid {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `random_indexes_in_range` is never used
[INFO] [stderr]   --> src/q1a.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> src/q1a.rs:27:8
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 26 | impl Grid {
[INFO] [stdout] 
[INFO] [stderr]    | --------- associated function in this implementation
[INFO] [stderr] 27 |     fn new(lx: usize, ly: usize, n: usize) -> Grid {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/q1a.rs:56:8
[INFO] [stderr]    |
[INFO] [stderr] 56 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Grid` is never constructed
[INFO] [stderr]   --> src/q2a.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | struct Grid {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `GridCell` is never used
[INFO] [stderr]   --> src/q2a.rs:15:6
[INFO] [stderr]    |
[INFO] [stderr] 15 | enum GridCell {
[INFO] [stderr]    |      ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `random_indexes_in_range` is never used
[INFO] [stderr]   --> src/q2a.rs:32:4
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn random_indexes_in_range(range: Range<usize>, expected: usize) -> HashSet<usize> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new` and `directly_reachable_from` are never used
[INFO] [stderr]   --> src/q2a.rs:46:8
[INFO] [stderr]    |
[INFO] [stderr] 45 | impl Grid {
[INFO] [stderr]    | --------- associated items in this implementation
[INFO] [stderr] 46 |     fn new(lx: usize, ly: usize, n: usize, p_super: f64) -> Grid {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 71 |     fn directly_reachable_from(&self, pos: (usize, usize)) -> HashSet<Pos> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type alias `Pos` is never used
[INFO] [stderr]    --> src/q2a.rs:117:6
[INFO] [stderr]     |
[INFO] [stderr] 117 | type Pos = (usize, usize);
[INFO] [stderr]     |      ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `ClusterFinder` is never constructed
[INFO] [stderr]    --> src/q2a.rs:119:8
[INFO] [stderr]     |
[INFO] [stderr] 119 | struct ClusterFinder {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `search`, and `step` are never used
[INFO] [stderr]    --> src/q2a.rs:130:8
[INFO] [stderr]     |
[INFO] [stderr] 129 | impl ClusterFinder {
[INFO] [stderr]     | ------------------ associated items in this implementation
[INFO] [stderr] 130 |     fn new(grid: Grid) -> ClusterFinder {
[INFO] [stderr]     |        ^^^
[INFO] [stderr] ...
[INFO] [stderr] 145 |     fn search(&mut self) {
[INFO] [stderr]     |        ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 151 |     fn step(&mut self) {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]    --> src/q2a.rs:192:8
[INFO] [stderr]     |
[INFO] [stderr] 192 | pub fn main() {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `cluster` is never used
[INFO] [stderr]   --> src/q2b/cluster_finder.rs:64:12
[INFO] [stderr]    |
[INFO] [stderr] 18 | impl <'a> ClusterFinder<'a> {
[INFO] [stderr]    | --------------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 64 |     pub fn cluster(&self) -> &HashSet<Pos> {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/q2b/cluster_finder.rs:19:22
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn new(grid: &Grid) -> ClusterFinder {
[INFO] [stderr]    |                      ^^^^^     ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                      |
[INFO] [stderr]    |                      the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn new(grid: &Grid) -> ClusterFinder<'_> {
[INFO] [stderr]    |                                             ++++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/q2b/cluster_finder.rs:28:42
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder {
[INFO] [stderr]    |                                          ^^^^^                         ^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                                          |
[INFO] [stderr]    |                                          the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub fn new_with_starting_point(grid: &Grid, initial_point: Pos) -> ClusterFinder<'_> {
[INFO] [stderr]    |                                                                                     ++++
[INFO] [stderr] 
[INFO] [stderr] warning: `cw-2-rs` (bin "cw-2-rs" test) generated 15 warnings (run `cargo fix --bin "cw-2-rs" -p cw-2-rs --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/cw_2_rs-2704061d90e1feaf)
[INFO] running `Command { std: "docker" "inspect" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa", kill_on_drop: false }`
[INFO] [stdout] 9a5b63ddc25598f5cf2d935ede538287a35de1cf272498162d5317017721c4fa
