[INFO] updating cached repository vbo/nnrs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/vbo/nnrs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/vbo/nnrs" "work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/vbo/nnrs"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/vbo/nnrs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/vbo/nnrs" "work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/vbo/nnrs"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/vbo/nnrs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d2321ff9ded9e103826e2f6523d21cf5b8912a3b
[INFO] sha for GitHub repo vbo/nnrs: d2321ff9ded9e103826e2f6523d21cf5b8912a3b
[INFO] validating manifest of vbo/nnrs on toolchain master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of vbo/nnrs on toolchain try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing vbo/nnrs
[INFO] finished frobbing vbo/nnrs
[INFO] frobbed toml for vbo/nnrs written to work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/vbo/nnrs/Cargo.toml
[INFO] started frobbing vbo/nnrs
[INFO] finished frobbing vbo/nnrs
[INFO] frobbed toml for vbo/nnrs written to work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/vbo/nnrs/Cargo.toml
[INFO] crate vbo/nnrs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking vbo/nnrs against master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 for pr-59199
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59199/worker-2/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/vbo/nnrs:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "-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" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4570cd622af49486055258eb44f95a2f838530fdff73b0ac04af4c004870d5be
[INFO] running `"docker" "start" "-a" "4570cd622af49486055258eb44f95a2f838530fdff73b0ac04af4c004870d5be"`
[INFO] [stderr]    Compiling matrixmultiply v0.1.14
[INFO] [stderr]     Checking yaml-rust v0.3.5
[INFO] [stderr]     Checking serde v1.0.43
[INFO] [stderr]     Checking rawpointer v0.1.0
[INFO] [stderr]    Compiling proc-macro2 v0.3.7
[INFO] [stderr]     Checking atty v0.2.9
[INFO] [stderr]    Compiling rand_derive v0.3.1
[INFO] [stderr]     Checking clap v2.31.2
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling syn v0.13.1
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling serde_derive v1.0.43
[INFO] [stderr]     Checking serde_json v1.0.16
[INFO] [stderr]     Checking nnrs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/mnist.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `math`
[INFO] [stderr]   --> src/mnist.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | use math;
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `math::Matrix`
[INFO] [stderr]   --> src/mnist.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use math::Matrix;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing`
[INFO] [stderr]   --> src/mnist.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use timing;
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/network.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing::Timing`
[INFO] [stderr]  --> src/parallel_trainer.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use timing::Timing;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde_json`
[INFO] [stderr]  --> src/snake.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use serde_json;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Network`
[INFO] [stderr]  --> src/snake_nn.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use network::{Network, NetworkParameters, NetworkPredictor};
[INFO] [stderr]   |               ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `IndependentSample`, `Range`
[INFO] [stderr]  --> src/snake_nn.rs:7:27
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rand::distributions::{IndependentSample, Range};
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc`
[INFO] [stderr]   --> src/snake_nn.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::sync::mpsc;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]   --> src/snake_nn.rs:19:23
[INFO] [stderr]    |
[INFO] [stderr] 19 | use std::sync::mpsc::{Receiver, Sender};
[INFO] [stderr]    |                       ^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing::duration_as_total_nanos`
[INFO] [stderr]   --> src/snake_nn.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 | use timing::duration_as_total_nanos;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/snake_nn.rs:340:8
[INFO] [stderr]     |
[INFO] [stderr] 340 |     if (rng.gen_range(0.0, 1.0) <= random_move_prob) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::hash_map::Entry`
[INFO] [stderr]  --> src/timing.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::hash_map::Entry;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::thread::sleep_ms': replaced by `std::thread::sleep`
[INFO] [stderr]    --> src/snake_nn.rs:176:13
[INFO] [stderr]     |
[INFO] [stderr] 176 |             thread::sleep_ms(SLEEP_INTERVAL_MS);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::thread::sleep_ms': replaced by `std::thread::sleep`
[INFO] [stderr]    --> src/snake_nn.rs:212:17
[INFO] [stderr]     |
[INFO] [stderr] 212 |                 thread::sleep_ms(SLEEP_INTERVAL_MS);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time`
[INFO] [stderr]  --> src/mnist.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::time;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `math`
[INFO] [stderr]   --> src/mnist.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | use math;
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `math::Matrix`
[INFO] [stderr]   --> src/mnist.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 | use math::Matrix;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing`
[INFO] [stderr]   --> src/mnist.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use timing;
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/network.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing::Timing`
[INFO] [stderr]  --> src/parallel_trainer.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use timing::Timing;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `serde_json`
[INFO] [stderr]  --> src/snake.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use serde_json;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Network`
[INFO] [stderr]  --> src/snake_nn.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use network::{Network, NetworkParameters, NetworkPredictor};
[INFO] [stderr]   |               ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `IndependentSample`, `Range`
[INFO] [stderr]  --> src/snake_nn.rs:7:27
[INFO] [stderr]   |
[INFO] [stderr] 7 | use rand::distributions::{IndependentSample, Range};
[INFO] [stderr]   |                           ^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc`
[INFO] [stderr]   --> src/snake_nn.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use std::sync::mpsc;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]   --> src/snake_nn.rs:19:23
[INFO] [stderr]    |
[INFO] [stderr] 19 | use std::sync::mpsc::{Receiver, Sender};
[INFO] [stderr]    |                       ^^^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `timing::duration_as_total_nanos`
[INFO] [stderr]   --> src/snake_nn.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 | use timing::duration_as_total_nanos;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/snake_nn.rs:340:8
[INFO] [stderr]     |
[INFO] [stderr] 340 |     if (rng.gen_range(0.0, 1.0) <= random_move_prob) {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::hash_map::Entry`
[INFO] [stderr]  --> src/timing.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::hash_map::Entry;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::thread::sleep_ms': replaced by `std::thread::sleep`
[INFO] [stderr]    --> src/snake_nn.rs:176:13
[INFO] [stderr]     |
[INFO] [stderr] 176 |             thread::sleep_ms(SLEEP_INTERVAL_MS);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::thread::sleep_ms': replaced by `std::thread::sleep`
[INFO] [stderr]    --> src/snake_nn.rs:212:17
[INFO] [stderr]     |
[INFO] [stderr] 212 |                 thread::sleep_ms(SLEEP_INTERVAL_MS);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/snake.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:53:24
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn execute_mnist_train(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                        ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:68:22
[INFO] [stderr]    |
[INFO] [stderr] 68 | fn execute_snake_new(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                      ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:73:24
[INFO] [stderr]    |
[INFO] [stderr] 73 | fn execute_snake_train(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                        ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:93:22
[INFO] [stderr]    |
[INFO] [stderr] 93 | fn execute_snake_gen(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                      ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]    --> src/main.rs:101:23
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn execute_snake_demo(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]     |                       ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hits`
[INFO] [stderr]   --> src/mnist.rs:64:13
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut hits = 0usize;
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_hits`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]   --> src/mnist.rs:98:30
[INFO] [stderr]    |
[INFO] [stderr] 98 |                 let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]    |                              ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `log_every_n`
[INFO] [stderr]   --> src/mnist.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     log_every_n: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^ help: consider prefixing with an underscore: `_log_every_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `layer_order`
[INFO] [stderr]    --> src/network.rs:645:13
[INFO] [stderr]     |
[INFO] [stderr] 645 |         let layer_order = nn.calc_layers_order();
[INFO] [stderr]     |             ^^^^^^^^^^^ help: consider prefixing with an underscore: `_layer_order`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `outputs`
[INFO] [stderr]    --> src/parallel_trainer.rs:150:21
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 let outputs = local_nn_predictor
[INFO] [stderr]     |                     ^^^^^^^ help: consider prefixing with an underscore: `_outputs`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `thread_no`
[INFO] [stderr]   --> src/parallel_trainer.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         for thread_no in 0..num_threads {
[INFO] [stderr]    |             ^^^^^^^^^ help: consider prefixing with an underscore: `_thread_no`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `iters`
[INFO] [stderr]    --> src/snake.rs:168:21
[INFO] [stderr]     |
[INFO] [stderr] 168 |             let mut iters = 0;
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_iters`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `epoch_no`
[INFO] [stderr]   --> src/snake_nn.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     for epoch_no in 0..num_epochs {
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_epoch_no`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]   --> src/snake_nn.rs:90:30
[INFO] [stderr]    |
[INFO] [stderr] 90 |                 let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]    |                              ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]    --> src/snake_nn.rs:109:18
[INFO] [stderr]     |
[INFO] [stderr] 109 |     let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]     |                  ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `max_gain`
[INFO] [stderr]    --> src/snake_nn.rs:357:13
[INFO] [stderr]     |
[INFO] [stderr] 357 |     let (i, max_gain) = get_max_with_pos(snake_inputs_gains.as_slice());
[INFO] [stderr]     |             ^^^^^^^^ help: consider prefixing with an underscore: `_max_gain`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_next_action_optimal`
[INFO] [stderr]    --> src/snake_nn.rs:503:13
[INFO] [stderr]     |
[INFO] [stderr] 503 |         let is_next_action_optimal = session[i - 1].is_optimal;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_is_next_action_optimal`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/snake_nn.rs:530:9
[INFO] [stderr]     |
[INFO] [stderr] 530 |     for i in 0..MAP_WIDTH * MAP_HEIGHT - 1 {
[INFO] [stderr]     |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/snake.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use rand::Rng;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:53:24
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn execute_mnist_train(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                        ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:68:22
[INFO] [stderr]    |
[INFO] [stderr] 68 | fn execute_snake_new(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                      ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:73:24
[INFO] [stderr]    |
[INFO] [stderr] 73 | fn execute_snake_train(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                        ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]   --> src/main.rs:93:22
[INFO] [stderr]    |
[INFO] [stderr] 93 | fn execute_snake_gen(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]    |                      ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]    --> src/main.rs:101:23
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn execute_snake_demo(matches: &ArgMatches, submatches: &ArgMatches) {
[INFO] [stderr]     |                       ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hits`
[INFO] [stderr]   --> src/mnist.rs:64:13
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut hits = 0usize;
[INFO] [stderr]    |             ^^^^ help: consider prefixing with an underscore: `_hits`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]   --> src/mnist.rs:98:30
[INFO] [stderr]    |
[INFO] [stderr] 98 |                 let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]    |                              ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `log_every_n`
[INFO] [stderr]   --> src/mnist.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     log_every_n: usize,
[INFO] [stderr]    |     ^^^^^^^^^^^ help: consider prefixing with an underscore: `_log_every_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `outputs`
[INFO] [stderr]    --> src/parallel_trainer.rs:150:21
[INFO] [stderr]     |
[INFO] [stderr] 150 |                 let outputs = local_nn_predictor
[INFO] [stderr]     |                     ^^^^^^^ help: consider prefixing with an underscore: `_outputs`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `thread_no`
[INFO] [stderr]   --> src/parallel_trainer.rs:46:13
[INFO] [stderr]    |
[INFO] [stderr] 46 |         for thread_no in 0..num_threads {
[INFO] [stderr]    |             ^^^^^^^^^ help: consider prefixing with an underscore: `_thread_no`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr] warning: unused variable: `iters`
[INFO] [stderr]    --> src/snake.rs:168:21
[INFO] [stderr]     |
[INFO] [stderr] 168 |             let mut iters = 0;
[INFO] [stderr]   --> src/mnist.rs:64:9
[INFO] [stderr]     |                     ^^^^^ help: consider prefixing with an underscore: `_iters`
[INFO] [stderr] 
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut hits = 0usize;
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `epoch_no`
[INFO] [stderr]   --> src/snake_nn.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     for epoch_no in 0..num_epochs {
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_epoch_no`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]   --> src/snake_nn.rs:90:30
[INFO] [stderr]    |
[INFO] [stderr] 90 |                 let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]    |                              ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `predictor`
[INFO] [stderr]    --> src/snake_nn.rs:109:18
[INFO] [stderr]     |
[INFO] [stderr] 109 |     let (params, predictor, _) = parallel_trainer.borrow_network_parts();
[INFO] [stderr]     |                  ^^^^^^^^^ help: consider prefixing with an underscore: `_predictor`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `max_gain`
[INFO] [stderr]    --> src/snake_nn.rs:357:13
[INFO] [stderr]     |
[INFO] [stderr] 357 |     let (i, max_gain) = get_max_with_pos(snake_inputs_gains.as_slice());
[INFO] [stderr]     |             ^^^^^^^^ help: consider prefixing with an underscore: `_max_gain`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `is_next_action_optimal`
[INFO] [stderr]    --> src/snake_nn.rs:503:13
[INFO] [stderr]     |
[INFO] [stderr] 503 |         let is_next_action_optimal = session[i - 1].is_optimal;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_is_next_action_optimal`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/snake_nn.rs:530:9
[INFO] [stderr]     |
[INFO] [stderr] 530 |     for i in 0..MAP_WIDTH * MAP_HEIGHT - 1 {
[INFO] [stderr]     |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/network.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut nn: Self = serde_json::from_reader(&file).unwrap();
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/mnist.rs:64:9
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut hits = 0usize;
[INFO] [stderr]    |         ----^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/network.rs:55:13
[INFO] [stderr]    |
[INFO] [stderr] 55 |         let mut nn: Self = serde_json::from_reader(&file).unwrap();
[INFO] [stderr]    |             ----^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:51
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |                                                   ----^^^^^^^^^^
[INFO] [stderr]    |                                                   |
[INFO] [stderr]    |                                                   help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:33
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |                                 ----^^^^^^^^^^^^
[INFO] [stderr]    |                                 |
[INFO] [stderr]    |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:14
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |              ----^^^^^^^^^^^^^
[INFO] [stderr]    |              |
[INFO] [stderr]    |              help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     mut job_receiver: Arc<Mutex<Receiver<TrainingJob>>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:124:5
[INFO] [stderr]     |
[INFO] [stderr] 124 |     mut output_sender: Sender<Arc<Mutex<NetworkTrainer>>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:126:5
[INFO] [stderr]     |
[INFO] [stderr] 126 |     mut local_nn_trainer: Arc<Mutex<NetworkTrainer>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/snake_nn.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let mut nn = network::Network::load_from_file(model_input_path);
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:51
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |                                                   ----^^^^^^^^^^
[INFO] [stderr]    |                                                   |
[INFO] [stderr]    |                                                   help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:33
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |                                 ----^^^^^^^^^^^^
[INFO] [stderr]    |                                 |
[INFO] [stderr]    |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parallel_trainer.rs:37:14
[INFO] [stderr]    |
[INFO] [stderr] 37 |         let (mut nn_parameters, mut nn_predictor, mut nn_trainer) = network.as_parts();
[INFO] [stderr]    |              ----^^^^^^^^^^^^^
[INFO] [stderr]    |              |
[INFO] [stderr]    |              help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snake_nn.rs:131:21
[INFO] [stderr]     |
[INFO] [stderr] 131 |                 let mut state = GameState {
[INFO] [stderr]     |                     ----^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snake_nn.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     let mut nn = network::Network::load_from_file(model_path);
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:123:5
[INFO] [stderr]     |
[INFO] [stderr] 123 |     mut job_receiver: Arc<Mutex<Receiver<TrainingJob>>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:124:5
[INFO] [stderr]     |
[INFO] [stderr] 124 |     mut output_sender: Sender<Arc<Mutex<NetworkTrainer>>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/parallel_trainer.rs:126:5
[INFO] [stderr]     |
[INFO] [stderr] 126 |     mut local_nn_trainer: Arc<Mutex<NetworkTrainer>>,
[INFO] [stderr]     |     ----^^^^^^^^^^^^^^^^
[INFO] [stderr]     |     |
[INFO] [stderr]     |     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_same_dim`
[INFO] [stderr]   --> src/math.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn new_same_dim(m: &Matrix) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `dot_vec`
[INFO] [stderr]   --> src/math.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn dot_vec(&self, vec: &Vector, res: &mut Vector) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty`
[INFO] [stderr]    --> src/math.rs:248:5
[INFO] [stderr]     |
[INFO] [stderr] 248 |     pub fn empty() -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `init_rand`
[INFO] [stderr]    --> src/math.rs:267:5
[INFO] [stderr]     |
[INFO] [stderr] 267 |     pub fn init_rand(mut self) -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `copy_from`
[INFO] [stderr]    --> src/math.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     pub fn copy_from(&mut self, v: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add`
[INFO] [stderr]    --> src/math.rs:322:5
[INFO] [stderr]     |
[INFO] [stderr] 322 |     pub fn add(&mut self, v: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fill_rand`
[INFO] [stderr]    --> src/math.rs:335:5
[INFO] [stderr]     |
[INFO] [stderr] 335 |     pub fn fill_rand(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `NANOS_IN_SECOND`
[INFO] [stderr]   --> src/mnist.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | const NANOS_IN_SECOND: u64 = 1_000_000_000;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_layer_mut`
[INFO] [stderr]   --> src/network.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn get_layer_mut(&mut self, id: LayerID) -> &mut Layer {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `predict`
[INFO] [stderr]    --> src/network.rs:466:5
[INFO] [stderr]     |
[INFO] [stderr] 466 |     pub fn predict(&mut self, input_data: &[f64]) -> &Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `backward_propagation`
[INFO] [stderr]    --> src/network.rs:470:5
[INFO] [stderr]     |
[INFO] [stderr] 470 |     pub fn backward_propagation(&mut self, true_outputs: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `apply_batch`
[INFO] [stderr]    --> src/network.rs:530:5
[INFO] [stderr]     |
[INFO] [stderr] 530 |     pub fn apply_batch(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `shared_training_data`
[INFO] [stderr]   --> src/parallel_trainer.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     shared_training_data: Arc<D>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `job_receiver`
[INFO] [stderr]   --> src/parallel_trainer.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     job_receiver: Arc<Mutex<Receiver<TrainingJob>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output_sender`
[INFO] [stderr]   --> src/parallel_trainer.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     output_sender: Sender<Arc<Mutex<NetworkTrainer>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `join_handles`
[INFO] [stderr]   --> src/parallel_trainer.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     join_handles: Vec<JoinHandle<()>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `teach_nn`
[INFO] [stderr]    --> src/snake_nn.rs:384:1
[INFO] [stderr]     |
[INFO] [stderr] 384 | / fn teach_nn(
[INFO] [stderr] 385 | |     nn: &mut network::Network,
[INFO] [stderr] 386 | |     state: &GameState,
[INFO] [stderr] 387 | |     snake_input: SnakeInput,
[INFO] [stderr] ...   |
[INFO] [stderr] 398 | |     nn.backward_propagation(&true_output_vec);
[INFO] [stderr] 399 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `elapsed`
[INFO] [stderr]   --> src/timing.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn elapsed(&self, name: &str) -> time::Duration {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/parallel_trainer.rs:85:13
[INFO] [stderr]    |
[INFO] [stderr] 85 | /             self.job_sender.send(TrainingJob {
[INFO] [stderr] 86 | |                 examples_indices: chunk,
[INFO] [stderr] 87 | |                 network_parameters: self.shared_nn_parameters.clone(),
[INFO] [stderr] 88 | |             });
[INFO] [stderr]    | |_______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/parallel_trainer.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 160 |         output_sender.send(local_nn_trainer.clone());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:118:9
[INFO] [stderr]     |
[INFO] [stderr] 118 |         writer.write("\n".as_bytes());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     writer.flush();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     writer.write(character.as_bytes());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake_nn.rs:140:21
[INFO] [stderr]     |
[INFO] [stderr] 140 |                     write!(training_data_file, "\n");
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake_nn.rs:150:9
[INFO] [stderr]     |
[INFO] [stderr] 150 |         jh.join();
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:203:17
[INFO] [stderr]     |
[INFO] [stderr] 203 |                 game_over: game_over,
[INFO] [stderr]     |                 ----------^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:271:13
[INFO] [stderr]     |
[INFO] [stderr] 271 |             game_over: game_over,
[INFO] [stderr]     |             ----------^^^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:308:17
[INFO] [stderr]     |
[INFO] [stderr] 308 |                 game_over: game_over,
[INFO] [stderr]     |                 ----------^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/snake_nn.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_attributes)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate-level attribute should be in the root module
[INFO] [stderr]  --> src/snake_nn.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/timing.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         writeln!(f, "=== Timing ===");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/timing.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 | /             writeln!(
[INFO] [stderr] 78 | |                 f,
[INFO] [stderr] 79 | |                 "{}: {}.{:04}s",
[INFO] [stderr] 80 | |                 name,
[INFO] [stderr] 81 | |                 timer.duration.as_secs(),
[INFO] [stderr] 82 | |                 timer.duration.subsec_nanos() / 1000000
[INFO] [stderr] 83 | |             );
[INFO] [stderr]    | |______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/snake_nn.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let mut nn = network::Network::load_from_file(model_input_path);
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snake_nn.rs:131:21
[INFO] [stderr]     |
[INFO] [stderr] 131 |                 let mut state = GameState {
[INFO] [stderr]     |                     ----^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/snake_nn.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     let mut nn = network::Network::load_from_file(model_path);
[INFO] [stderr]     |         ----^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new_same_dim`
[INFO] [stderr]   --> src/math.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     pub fn new_same_dim(m: &Matrix) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_slice`
[INFO] [stderr]   --> src/math.rs:27:5
[INFO] [stderr]    |
[INFO] [stderr] 27 |     pub fn from_slice(rows: usize, cols: usize, content: &[f64]) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `dot_vec`
[INFO] [stderr]   --> src/math.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     pub fn dot_vec(&self, vec: &Vector, res: &mut Vector) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `transpose`
[INFO] [stderr]    --> src/math.rs:155:5
[INFO] [stderr]     |
[INFO] [stderr] 155 |     pub fn transpose(&self, res: &mut Matrix) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_slice`
[INFO] [stderr]    --> src/math.rs:241:5
[INFO] [stderr]     |
[INFO] [stderr] 241 |     pub fn from_slice(content: &[f64]) -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `empty`
[INFO] [stderr]    --> src/math.rs:248:5
[INFO] [stderr]     |
[INFO] [stderr] 248 |     pub fn empty() -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `init_rand`
[INFO] [stderr]    --> src/math.rs:267:5
[INFO] [stderr]     |
[INFO] [stderr] 267 |     pub fn init_rand(mut self) -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `copy_from`
[INFO] [stderr]    --> src/math.rs:286:5
[INFO] [stderr]     |
[INFO] [stderr] 286 |     pub fn copy_from(&mut self, v: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add`
[INFO] [stderr]    --> src/math.rs:322:5
[INFO] [stderr]     |
[INFO] [stderr] 322 |     pub fn add(&mut self, v: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `fill_rand`
[INFO] [stderr]    --> src/math.rs:335:5
[INFO] [stderr]     |
[INFO] [stderr] 335 |     pub fn fill_rand(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `NANOS_IN_SECOND`
[INFO] [stderr]   --> src/mnist.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | const NANOS_IN_SECOND: u64 = 1_000_000_000;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_layer_mut`
[INFO] [stderr]   --> src/network.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn get_layer_mut(&mut self, id: LayerID) -> &mut Layer {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `calc_layers_order`
[INFO] [stderr]    --> src/network.rs:462:5
[INFO] [stderr]     |
[INFO] [stderr] 462 |     fn calc_layers_order(&self) -> Vec<LayerID> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `predict`
[INFO] [stderr]    --> src/network.rs:466:5
[INFO] [stderr]     |
[INFO] [stderr] 466 |     pub fn predict(&mut self, input_data: &[f64]) -> &Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `backward_propagation`
[INFO] [stderr]    --> src/network.rs:470:5
[INFO] [stderr]     |
[INFO] [stderr] 470 |     pub fn backward_propagation(&mut self, true_outputs: &Vector) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `apply_batch`
[INFO] [stderr]    --> src/network.rs:530:5
[INFO] [stderr]     |
[INFO] [stderr] 530 |     pub fn apply_batch(&mut self) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `shared_training_data`
[INFO] [stderr]   --> src/parallel_trainer.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     shared_training_data: Arc<D>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `job_receiver`
[INFO] [stderr]   --> src/parallel_trainer.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     job_receiver: Arc<Mutex<Receiver<TrainingJob>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `output_sender`
[INFO] [stderr]   --> src/parallel_trainer.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     output_sender: Sender<Arc<Mutex<NetworkTrainer>>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `join_handles`
[INFO] [stderr]   --> src/parallel_trainer.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     join_handles: Vec<JoinHandle<()>>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `teach_nn`
[INFO] [stderr]    --> src/snake_nn.rs:384:1
[INFO] [stderr]     |
[INFO] [stderr] 384 | / fn teach_nn(
[INFO] [stderr] 385 | |     nn: &mut network::Network,
[INFO] [stderr] 386 | |     state: &GameState,
[INFO] [stderr] 387 | |     snake_input: SnakeInput,
[INFO] [stderr] ...   |
[INFO] [stderr] 398 | |     nn.backward_propagation(&true_output_vec);
[INFO] [stderr] 399 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `elapsed`
[INFO] [stderr]   --> src/timing.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn elapsed(&self, name: &str) -> time::Duration {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/parallel_trainer.rs:85:13
[INFO] [stderr]    |
[INFO] [stderr] 85 | /             self.job_sender.send(TrainingJob {
[INFO] [stderr] 86 | |                 examples_indices: chunk,
[INFO] [stderr] 87 | |                 network_parameters: self.shared_nn_parameters.clone(),
[INFO] [stderr] 88 | |             });
[INFO] [stderr]    | |_______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/parallel_trainer.rs:160:9
[INFO] [stderr]     |
[INFO] [stderr] 160 |         output_sender.send(local_nn_trainer.clone());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:118:9
[INFO] [stderr]     |
[INFO] [stderr] 118 |         writer.write("\n".as_bytes());
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 |     writer.flush();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake.rs:131:5
[INFO] [stderr]     |
[INFO] [stderr] 131 |     writer.write(character.as_bytes());
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake_nn.rs:140:21
[INFO] [stderr]     |
[INFO] [stderr] 140 |                     write!(training_data_file, "\n");
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/snake_nn.rs:150:9
[INFO] [stderr]     |
[INFO] [stderr] 150 |         jh.join();
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:203:17
[INFO] [stderr]     |
[INFO] [stderr] 203 |                 game_over: game_over,
[INFO] [stderr]     |                 ----------^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(non_shorthand_field_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:271:13
[INFO] [stderr]     |
[INFO] [stderr] 271 |             game_over: game_over,
[INFO] [stderr]     |             ----------^^^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: the `game_over:` in this pattern is redundant
[INFO] [stderr]    --> src/snake_nn.rs:308:17
[INFO] [stderr]     |
[INFO] [stderr] 308 |                 game_over: game_over,
[INFO] [stderr]     |                 ----------^^^^^^^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]  --> src/snake_nn.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_attributes)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: crate-level attribute should be in the root module
[INFO] [stderr]  --> src/snake_nn.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/timing.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         writeln!(f, "=== Timing ===");
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/timing.rs:77:13
[INFO] [stderr]    |
[INFO] [stderr] 77 | /             writeln!(
[INFO] [stderr] 78 | |                 f,
[INFO] [stderr] 79 | |                 "{}: {}.{:04}s",
[INFO] [stderr] 80 | |                 name,
[INFO] [stderr] 81 | |                 timer.duration.as_secs(),
[INFO] [stderr] 82 | |                 timer.duration.subsec_nanos() / 1000000
[INFO] [stderr] 83 | |             );
[INFO] [stderr]    | |______________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.52s
[INFO] running `"docker" "inspect" "4570cd622af49486055258eb44f95a2f838530fdff73b0ac04af4c004870d5be"`
[INFO] running `"docker" "rm" "-f" "4570cd622af49486055258eb44f95a2f838530fdff73b0ac04af4c004870d5be"`
[INFO] [stdout] 4570cd622af49486055258eb44f95a2f838530fdff73b0ac04af4c004870d5be