[INFO] cloning repository https://github.com/gotcake/rust-nerual-net
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gotcake/rust-nerual-net" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgotcake%2Frust-nerual-net", kill_on_drop: false }`
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[INFO] checking gotcake/rust-nerual-net against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgotcake%2Frust-nerual-net" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
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[INFO] validating manifest of git repo https://github.com/gotcake/rust-nerual-net on toolchain 1.95.0
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[INFO] crate git repo https://github.com/gotcake/rust-nerual-net already has a lockfile, it will not be regenerated
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stderr]     Checking rust_neural_net v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_index_methods)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::split_slice_mut`
[INFO] [stdout]   --> src/net.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::utils::split_slice_mut;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::func::ErrorFn`
[INFO] [stdout]   --> src/net.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use crate::func::ErrorFn;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::square_f32`
[INFO] [stdout]  --> src/stats.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::utils::square_f32;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::data::PreparedDataSetIterator`
[INFO] [stdout]  --> src/train/backprop/singlethreaded.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::data::PreparedDataSetIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::layer::NetLayerBase`
[INFO] [stdout]  --> src/train/backprop/singlethreaded.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::layer::NetLayerBase;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng` and `SeedableRng`
[INFO] [stdout]  --> src/train/trainer.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, FromEntropy, SeedableRng};
[INFO] [stdout]   |            ^^^               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::stable_hash_seed`
[INFO] [stdout]   --> src/train/trainer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::utils::stable_hash_seed;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/train/trainer.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `executor::*` and `observer::*`
[INFO] [stdout]   --> src/train/mod.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     executor::*,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     observer::*,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/data.rs:9:1
[INFO] [stdout]    |
[INFO] [stdout]  9 | / quick_error! {
[INFO] [stdout] 10 | |     #[derive(Debug)]
[INFO] [stdout] 11 | |     enum CsvParseError {
[INFO] [stdout] 12 | |         ZeroColumns {
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/data.rs:9:1
[INFO] [stdout]    |
[INFO] [stdout]  9 | / quick_error! {
[INFO] [stdout] 10 | |     #[derive(Debug)]
[INFO] [stdout] 11 | |     enum CsvParseError {
[INFO] [stdout] 12 | |         ZeroColumns {
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/train/task.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | / quick_error! {
[INFO] [stdout] 21 | |     #[derive(Debug)]
[INFO] [stdout] 22 | |     pub enum TaskError {
[INFO] [stdout] 23 | |         None {
[INFO] [stdout] ...  |
[INFO] [stdout] 27 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FromEntropy`
[INFO] [stdout]  --> src/train/trainer.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, FromEntropy, SeedableRng};
[INFO] [stdout]   |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `biases`
[INFO] [stdout]    --> src/layer.rs:162:23
[INFO] [stdout]     |
[INFO] [stdout] 162 |         let (weights, biases) = split_slice(weight_buffer, self.num_weights, self.size);
[INFO] [stdout]     |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_biases`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `partition_shift` is assigned to, but never used
[INFO] [stdout]   --> src/train/backprop/multithreaded.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |             let mut partition_shift = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_partition_shift` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `partition_shift` is never read
[INFO] [stdout]    --> src/train/backprop/multithreaded.rs:116:21
[INFO] [stdout]     |
[INFO] [stdout] 116 |                     partition_shift = shared_state.partition_row_shifts[partition_index];
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_emitter`
[INFO] [stdout]   --> src/train/task.rs:53:27
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn exec(mut self, update_emitter: &dyn TaskUpdateEmitter) -> Result<TaskResult, TaskError> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_emitter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `task_id`
[INFO] [stdout]    --> src/train/trainer.rs:179:56
[INFO] [stdout]     |
[INFO] [stdout] 179 |                         ExecutorEvent::ExecutorError { task_id, executor_id, error} => {
[INFO] [stdout]     |                                                        ^^^^^^^ help: try ignoring the field: `task_id: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `executor_id`
[INFO] [stdout]    --> src/train/trainer.rs:179:65
[INFO] [stdout]     |
[INFO] [stdout] 179 |                         ExecutorEvent::ExecutorError { task_id, executor_id, error} => {
[INFO] [stdout]     |                                                                 ^^^^^^^^^^^ help: try ignoring the field: `executor_id: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]   --> src/main.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn observer_callback(event: &TrainingEvent) {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_neural_net` (bin "rust_neural_net") due to 1 previous error; 20 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_index_methods)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::split_slice_mut`
[INFO] [stdout]   --> src/net.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::utils::split_slice_mut;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::func::ErrorFn`
[INFO] [stdout]   --> src/net.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use crate::func::ErrorFn;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::square_f32`
[INFO] [stdout]  --> src/stats.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::utils::square_f32;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::data::PreparedDataSetIterator`
[INFO] [stdout]  --> src/train/backprop/singlethreaded.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::data::PreparedDataSetIterator;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::layer::NetLayerBase`
[INFO] [stdout]  --> src/train/backprop/singlethreaded.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::layer::NetLayerBase;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Rng` and `SeedableRng`
[INFO] [stdout]  --> src/train/trainer.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, FromEntropy, SeedableRng};
[INFO] [stdout]   |            ^^^               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::utils::stable_hash_seed`
[INFO] [stdout]   --> src/train/trainer.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::utils::stable_hash_seed;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]   --> src/train/trainer.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | use std::rc::Rc;
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `executor::*` and `observer::*`
[INFO] [stdout]   --> src/train/mod.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     executor::*,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     observer::*,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/data.rs:9:1
[INFO] [stdout]    |
[INFO] [stdout]  9 | / quick_error! {
[INFO] [stdout] 10 | |     #[derive(Debug)]
[INFO] [stdout] 11 | |     enum CsvParseError {
[INFO] [stdout] 12 | |         ZeroColumns {
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/data.rs:9:1
[INFO] [stdout]    |
[INFO] [stdout]  9 | / quick_error! {
[INFO] [stdout] 10 | |     #[derive(Debug)]
[INFO] [stdout] 11 | |     enum CsvParseError {
[INFO] [stdout] 12 | |         ZeroColumns {
[INFO] [stdout] ...  |
[INFO] [stdout] 35 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/train/task.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | / quick_error! {
[INFO] [stdout] 21 | |     #[derive(Debug)]
[INFO] [stdout] 22 | |     pub enum TaskError {
[INFO] [stdout] 23 | |         None {
[INFO] [stdout] ...  |
[INFO] [stdout] 27 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `quick_error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FromEntropy`
[INFO] [stdout]  --> src/train/trainer.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{Rng, FromEntropy, SeedableRng};
[INFO] [stdout]   |                 ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `biases`
[INFO] [stdout]    --> src/layer.rs:162:23
[INFO] [stdout]     |
[INFO] [stdout] 162 |         let (weights, biases) = split_slice(weight_buffer, self.num_weights, self.size);
[INFO] [stdout]     |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_biases`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/net.rs:262:13
[INFO] [stdout]     |
[INFO] [stdout] 262 |         let mut net = config.create_net();
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/net.rs:266:13
[INFO] [stdout]     |
[INFO] [stdout] 266 |         let mut net2 = config2.create_net();
[INFO] [stdout]     |             ----^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `partition_shift` is assigned to, but never used
[INFO] [stdout]   --> src/train/backprop/multithreaded.rs:61:17
[INFO] [stdout]    |
[INFO] [stdout] 61 |             let mut partition_shift = 0;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_partition_shift` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `partition_shift` is never read
[INFO] [stdout]    --> src/train/backprop/multithreaded.rs:116:21
[INFO] [stdout]     |
[INFO] [stdout] 116 |                     partition_shift = shared_state.partition_row_shifts[partition_index];
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `update_emitter`
[INFO] [stdout]   --> src/train/task.rs:53:27
[INFO] [stdout]    |
[INFO] [stdout] 53 |     pub fn exec(mut self, update_emitter: &dyn TaskUpdateEmitter) -> Result<TaskResult, TaskError> {
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_update_emitter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `task_id`
[INFO] [stdout]    --> src/train/trainer.rs:179:56
[INFO] [stdout]     |
[INFO] [stdout] 179 |                         ExecutorEvent::ExecutorError { task_id, executor_id, error} => {
[INFO] [stdout]     |                                                        ^^^^^^^ help: try ignoring the field: `task_id: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `executor_id`
[INFO] [stdout]    --> src/train/trainer.rs:179:65
[INFO] [stdout]     |
[INFO] [stdout] 179 |                         ExecutorEvent::ExecutorError { task_id, executor_id, error} => {
[INFO] [stdout]     |                                                                 ^^^^^^^^^^^ help: try ignoring the field: `executor_id: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `event`
[INFO] [stdout]   --> src/main.rs:58:22
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn observer_callback(event: &TrainingEvent) {
[INFO] [stdout]    |                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_event`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_neural_net` (bin "rust_neural_net" test) due to 1 previous error; 22 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ff42c1dad1f84ae3a9c72fd1d8403e38b761331646b9da4730eafacfe21868a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff42c1dad1f84ae3a9c72fd1d8403e38b761331646b9da4730eafacfe21868a6", kill_on_drop: false }`
[INFO] [stdout] ff42c1dad1f84ae3a9c72fd1d8403e38b761331646b9da4730eafacfe21868a6
