[INFO] cloning repository https://github.com/fdietze/chromogene
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fdietze/chromogene" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffdietze%2Fchromogene", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffdietze%2Fchromogene'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 391ebde42589af9af8b27a48cf7d465bc933c1f0
[INFO] checking fdietze/chromogene against master#5e3f1b148db5bfa27fee52464ae1f5d34c49d77b for pr-75502
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffdietze%2Fchromogene" "/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/fdietze/chromogene on toolchain 5e3f1b148db5bfa27fee52464ae1f5d34c49d77b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/fdietze/chromogene
[INFO] finished tweaking git repo https://github.com/fdietze/chromogene
[INFO] tweaked toml for git repo https://github.com/fdietze/chromogene written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/fdietze/chromogene already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-1/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `git://github.com/BurntSushi/rust-stats`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "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" "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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4509fe64937716ca2545e47b1cb95cca7990e6fa56d7eca6992e40a33b9150c9
[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" "4509fe64937716ca2545e47b1cb95cca7990e6fa56d7eca6992e40a33b9150c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4509fe64937716ca2545e47b1cb95cca7990e6fa56d7eca6992e40a33b9150c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4509fe64937716ca2545e47b1cb95cca7990e6fa56d7eca6992e40a33b9150c9", kill_on_drop: false }`
[INFO] [stdout] 4509fe64937716ca2545e47b1cb95cca7990e6fa56d7eca6992e40a33b9150c9
[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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+5e3f1b148db5bfa27fee52464ae1f5d34c49d77b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b004f3306989712c77cd8835aceb0228038d01db02720d3659d30593e572367
[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" "0b004f3306989712c77cd8835aceb0228038d01db02720d3659d30593e572367", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling siphasher v0.2.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]     Checking phf_shared v0.7.24
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]     Checking phf v0.7.24
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking streaming-stats v0.2.3 (git://github.com/BurntSushi/rust-stats#aaa17b69)
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling phf_codegen v0.7.24
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]    Compiling palette v0.2.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking chromogene v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:54:21
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let direction = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:69:16
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let stat = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let parameter = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Lch`, `Rgb`
[INFO] [stdout]   --> src/main.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 | use palette::{Lab, Lch, Rgb};
[INFO] [stdout]    |                    ^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `palette::Limited`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use palette::Limited;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rand`, `Rng`
[INFO] [stdout]   --> src/main.rs:17:24
[INFO] [stdout]    |
[INFO] [stdout] 17 | use rand::{thread_rng, Rng, Rand};
[INFO] [stdout]    |                        ^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IndependentSample`, `Normal`
[INFO] [stdout]   --> src/main.rs:18:27
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rand::distributions::{Normal, IndependentSample};
[INFO] [stdout]    |                           ^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::distributions::exponential::Exp1`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use rand::distributions::exponential::Exp1;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `mean`, `stddev`
[INFO] [stdout]   --> src/main.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 | use stats::{stddev, mean};
[INFO] [stdout]    |             ^^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lch`
[INFO] [stdout]  --> src/fitness.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use palette::{Lab, Lch};
[INFO] [stdout]   |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `FitnessData`, `StatValues`
[INFO] [stdout]   --> src/main.rs:25:46
[INFO] [stdout]    |
[INFO] [stdout] 25 | use fitness::{ColorSchemeProblemDescription, FitnessData, StatValues};
[INFO] [stdout]    |                                              ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::distributions::IndependentSample`
[INFO] [stdout]  --> src/genetic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::distributions::IndependentSample;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ProblemDescription`
[INFO] [stdout]   --> src/main.rs:32:37
[INFO] [stdout]    |
[INFO] [stdout] 32 | use genetic::{Population, Genotype, ProblemDescription};
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:54:21
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let direction = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:69:16
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let stat = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/main.rs:79:21
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let parameter = try!(line.next().ok_or("expected string").and_then(|string| {
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Lch`, `Rgb`
[INFO] [stdout]   --> src/main.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 | use palette::{Lab, Lch, Rgb};
[INFO] [stdout]    |                    ^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `palette::Limited`
[INFO] [stdout]   --> src/main.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | use palette::Limited;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rand`, `Rng`
[INFO] [stdout]   --> src/main.rs:17:24
[INFO] [stdout]    |
[INFO] [stdout] 17 | use rand::{thread_rng, Rng, Rand};
[INFO] [stdout]    |                        ^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IndependentSample`, `Normal`
[INFO] [stdout]   --> src/main.rs:18:27
[INFO] [stdout]    |
[INFO] [stdout] 18 | use rand::distributions::{Normal, IndependentSample};
[INFO] [stdout]    |                           ^^^^^^  ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::distributions::exponential::Exp1`
[INFO] [stdout]   --> src/main.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | use rand::distributions::exponential::Exp1;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `mean`, `stddev`
[INFO] [stdout]   --> src/main.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 | use stats::{stddev, mean};
[INFO] [stdout]    |             ^^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Lch`
[INFO] [stdout]  --> src/fitness.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | use palette::{Lab, Lch};
[INFO] [stdout]   |                    ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `FitnessData`, `StatValues`
[INFO] [stdout]   --> src/main.rs:25:46
[INFO] [stdout]    |
[INFO] [stdout] 25 | use fitness::{ColorSchemeProblemDescription, FitnessData, StatValues};
[INFO] [stdout]    |                                              ^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rand::distributions::IndependentSample`
[INFO] [stdout]  --> src/genetic.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand::distributions::IndependentSample;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ProblemDescription`
[INFO] [stdout]   --> src/main.rs:32:37
[INFO] [stdout]    |
[INFO] [stdout] 32 | use genetic::{Population, Genotype, ProblemDescription};
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::ops::Add;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Rand`
[INFO] [stdout]  --> src/genetic.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, Rand};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use std::ops::Add;
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Rand`
[INFO] [stdout]  --> src/genetic.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, Rand};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `run`
[INFO] [stdout]    --> src/main.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     for run in 0..runs {
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_run`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fixed_dist`
[INFO] [stdout]    --> src/colorscheme.rs:107:13
[INFO] [stdout]     |
[INFO] [stdout] 107 |         let fixed_dist: Vec<(&Lab, &Lab, f32)> = descr.fixed_colors
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fixed_dist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `run`
[INFO] [stdout]    --> src/main.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |     for run in 0..runs {
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_run`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `free_dist`
[INFO] [stdout]    --> src/colorscheme.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |         let free_dist: Vec<(&Lab, &Lab, f32)> = self.free_colors
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_free_dist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rng`
[INFO] [stdout]    --> src/colorscheme.rs:193:54
[INFO] [stdout]     |
[INFO] [stdout] 193 |     fn crossover<R: Rng>(&self, other: &ColorScheme, rng: &mut R) -> ColorScheme {
[INFO] [stdout]     |                                                      ^^^ help: if this is intentional, prefix it with an underscore: `_rng`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fixed_dist`
[INFO] [stdout]    --> src/colorscheme.rs:107:13
[INFO] [stdout]     |
[INFO] [stdout] 107 |         let fixed_dist: Vec<(&Lab, &Lab, f32)> = descr.fixed_colors
[INFO] [stdout]     |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_fixed_dist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `free_dist`
[INFO] [stdout]    --> src/colorscheme.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |         let free_dist: Vec<(&Lab, &Lab, f32)> = self.free_colors
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_free_dist`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rng`
[INFO] [stdout]    --> src/colorscheme.rs:193:54
[INFO] [stdout]     |
[INFO] [stdout] 193 |     fn crossover<R: Rng>(&self, other: &ColorScheme, rng: &mut R) -> ColorScheme {
[INFO] [stdout]     |                                                      ^^^ help: if this is intentional, prefix it with an underscore: `_rng`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_col_dist`
[INFO] [stdout]   --> src/color.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn print_col_dist(coldist: (&Lab, &Lab, f32)) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Change`
[INFO] [stdout]   --> src/main.rs:46:6
[INFO] [stdout]    |
[INFO] [stdout] 46 | enum Change {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(slice_patterns)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `iter_arith` has been stable since 1.11.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(iter_arith)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_col_dist`
[INFO] [stdout]   --> src/color.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 | pub fn print_col_dist(coldist: (&Lab, &Lab, f32)) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Change`
[INFO] [stdout]   --> src/main.rs:46:6
[INFO] [stdout]    |
[INFO] [stdout] 46 | enum Change {
[INFO] [stdout]    |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_patterns` has been stable since 1.42.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(slice_patterns)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `iter_arith` has been stable since 1.11.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(iter_arith)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.86s
[INFO] running `Command { std: "docker" "inspect" "0b004f3306989712c77cd8835aceb0228038d01db02720d3659d30593e572367", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b004f3306989712c77cd8835aceb0228038d01db02720d3659d30593e572367", kill_on_drop: false }`
[INFO] [stdout] 0b004f3306989712c77cd8835aceb0228038d01db02720d3659d30593e572367