[INFO] updating cached repository tinrab/rusty-neuron
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tinrab/rusty-neuron
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tinrab/rusty-neuron" "work/ex/clippy-test-run/sources/stable/gh/tinrab/rusty-neuron"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/tinrab/rusty-neuron'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tinrab/rusty-neuron" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tinrab/rusty-neuron"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tinrab/rusty-neuron'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 355d4dc7bcf2c24bdd3e52c4e36650b0db23f5a8
[INFO] sha for GitHub repo tinrab/rusty-neuron: 355d4dc7bcf2c24bdd3e52c4e36650b0db23f5a8
[INFO] validating manifest of tinrab/rusty-neuron on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tinrab/rusty-neuron on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tinrab/rusty-neuron
[INFO] finished frobbing tinrab/rusty-neuron
[INFO] frobbed toml for tinrab/rusty-neuron written to work/ex/clippy-test-run/sources/stable/gh/tinrab/rusty-neuron/Cargo.toml
[INFO] started frobbing tinrab/rusty-neuron
[INFO] finished frobbing tinrab/rusty-neuron
[INFO] frobbed toml for tinrab/rusty-neuron written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tinrab/rusty-neuron/Cargo.toml
[INFO] crate tinrab/rusty-neuron has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting tinrab/rusty-neuron against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-7/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tinrab/rusty-neuron:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dclippy::into_iter_on_array" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4ed7ca7dbf2ce05daa68d6e0dd2cd22b27b7bfbdc92d5b13676f4ab9abd2688b
[INFO] running `"docker" "start" "-a" "4ed7ca7dbf2ce05daa68d6e0dd2cd22b27b7bfbdc92d5b13676f4ab9abd2688b"`
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]     Checking rusty-neuron v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `activation::*`
[INFO] [stderr]  --> src/synapse.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use activation::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]   --> src/synapse.rs:27:3
[INFO] [stderr]    |
[INFO] [stderr] 27 |         s
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]   --> src/synapse.rs:18:11
[INFO] [stderr]    |
[INFO] [stderr] 18 |           let s = Synapse {
[INFO] [stderr]    |  _________________^
[INFO] [stderr] 19 | |             source,
[INFO] [stderr] 20 | |             target,
[INFO] [stderr] 21 | |             regularization,
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |             derivative_count: 0,
[INFO] [stderr] 26 | |         };
[INFO] [stderr]    | |_________^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `activation::*`
[INFO] [stderr]  --> src/network.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use activation::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error::*`
[INFO] [stderr]  --> src/network.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use error::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `regularization::*`
[INFO] [stderr]  --> src/network.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use regularization::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `neuron::*`
[INFO] [stderr]  --> src/network.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use neuron::*;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `activation::*`
[INFO] [stderr]  --> src/synapse.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use activation::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]   --> src/synapse.rs:27:3
[INFO] [stderr]    |
[INFO] [stderr] 27 |         s
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]   --> src/synapse.rs:18:11
[INFO] [stderr]    |
[INFO] [stderr] 18 |           let s = Synapse {
[INFO] [stderr]    |  _________________^
[INFO] [stderr] 19 | |             source,
[INFO] [stderr] 20 | |             target,
[INFO] [stderr] 21 | |             regularization,
[INFO] [stderr] ...  |
[INFO] [stderr] 25 | |             derivative_count: 0,
[INFO] [stderr] 26 | |         };
[INFO] [stderr]    | |_________^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `activation::*`
[INFO] [stderr]  --> src/network.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use activation::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error::*`
[INFO] [stderr]  --> src/network.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use error::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `regularization::*`
[INFO] [stderr]  --> src/network.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use regularization::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `neuron::*`
[INFO] [stderr]  --> src/network.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use neuron::*;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/network.rs:16:6
[INFO] [stderr]    |
[INFO] [stderr] 16 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/activation.rs:13:23
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn derivative(&self, x: f64) -> f64 {
[INFO] [stderr]    |                          ^ help: consider using `_x` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `structure`
[INFO] [stderr]  --> src/network.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(structure: &[u32]) -> Network {
[INFO] [stderr]   |                ^^^^^^^^^ help: consider using `_structure` instead
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ReLUActivationFunction`
[INFO] [stderr]   --> src/activation.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub struct ReLUActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SigmoidActivationFunction`
[INFO] [stderr]   --> src/activation.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | pub struct SigmoidActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `TanhActivationFunction`
[INFO] [stderr]   --> src/activation.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub struct TanhActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SquareErrorFunction`
[INFO] [stderr]  --> src/error.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct SquareErrorFunction {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `L1RegularizationFunction`
[INFO] [stderr]  --> src/regularization.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct L1RegularizationFunction {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `L2RegularizationFunction`
[INFO] [stderr]   --> src/regularization.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub struct L2RegularizationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `activation`
[INFO] [stderr]  --> src/neuron.rs:4:2
[INFO] [stderr]   |
[INFO] [stderr] 4 |     activation: Box<ActivationFunction>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `bias`
[INFO] [stderr]  --> src/neuron.rs:5:2
[INFO] [stderr]   |
[INFO] [stderr] 5 |     bias: f64,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input`
[INFO] [stderr]  --> src/neuron.rs:6:2
[INFO] [stderr]   |
[INFO] [stderr] 6 |     input: f64,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output`
[INFO] [stderr]  --> src/neuron.rs:7:2
[INFO] [stderr]   |
[INFO] [stderr] 7 |     output: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output_derivative`
[INFO] [stderr]  --> src/neuron.rs:8:2
[INFO] [stderr]   |
[INFO] [stderr] 8 |     output_derivative: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative`
[INFO] [stderr]  --> src/neuron.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     input_derivative: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative_sum`
[INFO] [stderr]   --> src/neuron.rs:10:2
[INFO] [stderr]    |
[INFO] [stderr] 10 |     input_derivative_sum: f64,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative_count`
[INFO] [stderr]   --> src/neuron.rs:11:2
[INFO] [stderr]    |
[INFO] [stderr] 11 |     input_derivative_count: u32,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/neuron.rs:30:2
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn new(activation: Box<ActivationFunction>) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `reset`
[INFO] [stderr]   --> src/neuron.rs:37:2
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn reset(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/neuron.rs:41:2
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn update(&mut self) -> f64 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Synapse`
[INFO] [stderr]  --> src/synapse.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Synapse<'a> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/synapse.rs:17:2
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(source: &'a Neuron, target: &'a Neuron, regularization: Box<RegularizationFunction>) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Network`
[INFO] [stderr]  --> src/network.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Network {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/network.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(structure: &[u32]) -> Network {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/activation.rs:13:23
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn derivative(&self, x: f64) -> f64 {
[INFO] [stderr]    |                          ^ help: consider using `_x` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `structure`
[INFO] [stderr]  --> src/network.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(structure: &[u32]) -> Network {
[INFO] [stderr]   |                ^^^^^^^^^ help: consider using `_structure` instead
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ReLUActivationFunction`
[INFO] [stderr]   --> src/activation.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub struct ReLUActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SigmoidActivationFunction`
[INFO] [stderr]   --> src/activation.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | pub struct SigmoidActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `TanhActivationFunction`
[INFO] [stderr]   --> src/activation.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | pub struct TanhActivationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SquareErrorFunction`
[INFO] [stderr]  --> src/error.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct SquareErrorFunction {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `L1RegularizationFunction`
[INFO] [stderr]  --> src/regularization.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct L1RegularizationFunction {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `L2RegularizationFunction`
[INFO] [stderr]   --> src/regularization.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | pub struct L2RegularizationFunction {}
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `activation`
[INFO] [stderr]  --> src/neuron.rs:4:2
[INFO] [stderr]   |
[INFO] [stderr] 4 |     activation: Box<ActivationFunction>,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `bias`
[INFO] [stderr]  --> src/neuron.rs:5:2
[INFO] [stderr]   |
[INFO] [stderr] 5 |     bias: f64,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input`
[INFO] [stderr]  --> src/neuron.rs:6:2
[INFO] [stderr]   |
[INFO] [stderr] 6 |     input: f64,
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output`
[INFO] [stderr]  --> src/neuron.rs:7:2
[INFO] [stderr]   |
[INFO] [stderr] 7 |     output: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output_derivative`
[INFO] [stderr]  --> src/neuron.rs:8:2
[INFO] [stderr]   |
[INFO] [stderr] 8 |     output_derivative: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative`
[INFO] [stderr]  --> src/neuron.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     input_derivative: f64,
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative_sum`
[INFO] [stderr]   --> src/neuron.rs:10:2
[INFO] [stderr]    |
[INFO] [stderr] 10 |     input_derivative_sum: f64,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `input_derivative_count`
[INFO] [stderr]   --> src/neuron.rs:11:2
[INFO] [stderr]    |
[INFO] [stderr] 11 |     input_derivative_count: u32,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/neuron.rs:30:2
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn new(activation: Box<ActivationFunction>) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `reset`
[INFO] [stderr]   --> src/neuron.rs:37:2
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn reset(&mut self) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `update`
[INFO] [stderr]   --> src/neuron.rs:41:2
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn update(&mut self) -> f64 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Synapse`
[INFO] [stderr]  --> src/synapse.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Synapse<'a> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/synapse.rs:17:2
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn new(source: &'a Neuron, target: &'a Neuron, regularization: Box<RegularizationFunction>) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Network`
[INFO] [stderr]  --> src/network.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Network {}
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/network.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn new(structure: &[u32]) -> Network {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.92s
[INFO] running `"docker" "inspect" "4ed7ca7dbf2ce05daa68d6e0dd2cd22b27b7bfbdc92d5b13676f4ab9abd2688b"`
[INFO] running `"docker" "rm" "-f" "4ed7ca7dbf2ce05daa68d6e0dd2cd22b27b7bfbdc92d5b13676f4ab9abd2688b"`
[INFO] [stdout] 4ed7ca7dbf2ce05daa68d6e0dd2cd22b27b7bfbdc92d5b13676f4ab9abd2688b