[INFO] cloning repository https://github.com/77Tigers/mnist
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/77Tigers/mnist" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F77Tigers%2Fmnist", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F77Tigers%2Fmnist'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3a2e576af8078d72d5277ffd29d327fe0cfe9e70
[INFO] testing 77Tigers/mnist against master#d98a5da813da67eb189387b8ccfb73cf481275d8+rustflags=-Copt-level=3 for pr-138759
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F77Tigers%2Fmnist" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/77Tigers/mnist
[INFO] finished tweaking git repo https://github.com/77Tigers/mnist
[INFO] tweaked toml for git repo https://github.com/77Tigers/mnist written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/77Tigers/mnist on toolchain d98a5da813da67eb189387b8ccfb73cf481275d8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/77Tigers/mnist already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded portable-atomic-util v0.2.2
[INFO] [stderr]   Downloaded mnist v0.6.0
[INFO] [stderr]   Downloaded ndarray v0.16.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5164bcb90aa0cbc1d111927409a31fdea2c39b745b096a10f3087df579c877b3
[INFO] running `Command { std: "docker" "start" "-a" "5164bcb90aa0cbc1d111927409a31fdea2c39b745b096a10f3087df579c877b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5164bcb90aa0cbc1d111927409a31fdea2c39b745b096a10f3087df579c877b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5164bcb90aa0cbc1d111927409a31fdea2c39b745b096a10f3087df579c877b3", kill_on_drop: false }`
[INFO] [stdout] 5164bcb90aa0cbc1d111927409a31fdea2c39b745b096a10f3087df579c877b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 258937d905ff7a8a507ab7d841e83ab15eb19665fb1f103ff826d4af7ec0cf89
[INFO] running `Command { std: "docker" "start" "-a" "258937d905ff7a8a507ab7d841e83ab15eb19665fb1f103ff826d4af7ec0cf89", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling libm v0.2.8
[INFO] [stderr]    Compiling libc v0.2.158
[INFO] [stderr]    Compiling serde v1.0.210
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling matrixmultiply v0.3.9
[INFO] [stderr]    Compiling mnist v0.6.0
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling syn v2.0.77
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling ndarray v0.16.1
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rand_distr v0.4.3
[INFO] [stderr]    Compiling my_mnist_network v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::Write;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize` and `Serialize`
[INFO] [stdout]   --> src/main.rs:10:14
[INFO] [stdout]    |
[INFO] [stdout] 10 | use serde::{ Serialize, Deserialize };
[INFO] [stdout]    |              ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Distribution`
[INFO] [stdout]  --> src/main.rs:4:27
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::distributions::{Distribution};
[INFO] [stdout]   |                           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rng`
[INFO] [stdout]   --> src/main.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let mut rng = rand::thread_rng();
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_rng`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let mut rng = rand::thread_rng();
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `model`
[INFO] [stdout]    --> src/main.rs:426:13
[INFO] [stdout]     |
[INFO] [stdout] 426 |     let mut model = ErrorLoss {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `model`
[INFO] [stdout]    --> src/main.rs:440:13
[INFO] [stdout]     |
[INFO] [stdout] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:426:9
[INFO] [stdout]     |
[INFO] [stdout] 426 |     let mut model = ErrorLoss {
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:440:9
[INFO] [stdout]     |
[INFO] [stdout] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `loss_fn` is never read
[INFO] [stdout]    --> src/main.rs:161:5
[INFO] [stdout]     |
[INFO] [stdout] 155 | struct ErrorLoss<M, FL, FD>
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 161 |     loss_fn: FL,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Trainer` is never constructed
[INFO] [stdout]    --> src/main.rs:551:8
[INFO] [stdout]     |
[INFO] [stdout] 551 | struct Trainer<M>
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 38.26s
[INFO] running `Command { std: "docker" "inspect" "258937d905ff7a8a507ab7d841e83ab15eb19665fb1f103ff826d4af7ec0cf89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "258937d905ff7a8a507ab7d841e83ab15eb19665fb1f103ff826d4af7ec0cf89", kill_on_drop: false }`
[INFO] [stdout] 258937d905ff7a8a507ab7d841e83ab15eb19665fb1f103ff826d4af7ec0cf89
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6021f04f7bdb00ff6e67e1cc0ad0e5653ab5091f85c9260923ebaeed6a4b0baf
[INFO] running `Command { std: "docker" "start" "-a" "6021f04f7bdb00ff6e67e1cc0ad0e5653ab5091f85c9260923ebaeed6a4b0baf", kill_on_drop: false }`
[INFO] [stderr]    Compiling my_mnist_network v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::io`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::io;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::io::Write;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Deserialize` and `Serialize`
[INFO] [stdout]   --> src/main.rs:10:14
[INFO] [stdout]    |
[INFO] [stdout] 10 | use serde::{ Serialize, Deserialize };
[INFO] [stdout]    |              ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Distribution`
[INFO] [stdout]  --> src/main.rs:4:27
[INFO] [stdout]   |
[INFO] [stdout] 4 | use rand::distributions::{Distribution};
[INFO] [stdout]   |                           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rng`
[INFO] [stdout]   --> src/main.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let mut rng = rand::thread_rng();
[INFO] [stdout]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_rng`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 57 |         let mut rng = rand::thread_rng();
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `model`
[INFO] [stdout]    --> src/main.rs:426:13
[INFO] [stdout]     |
[INFO] [stdout] 426 |     let mut model = ErrorLoss {
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `model`
[INFO] [stdout]    --> src/main.rs:440:13
[INFO] [stdout]     |
[INFO] [stdout] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:426:9
[INFO] [stdout]     |
[INFO] [stdout] 426 |     let mut model = ErrorLoss {
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:440:9
[INFO] [stdout]     |
[INFO] [stdout] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `loss_fn` is never read
[INFO] [stdout]    --> src/main.rs:161:5
[INFO] [stdout]     |
[INFO] [stdout] 155 | struct ErrorLoss<M, FL, FD>
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 161 |     loss_fn: FL,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Trainer` is never constructed
[INFO] [stdout]    --> src/main.rs:551:8
[INFO] [stdout]     |
[INFO] [stdout] 551 | struct Trainer<M>
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "6021f04f7bdb00ff6e67e1cc0ad0e5653ab5091f85c9260923ebaeed6a4b0baf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6021f04f7bdb00ff6e67e1cc0ad0e5653ab5091f85c9260923ebaeed6a4b0baf", kill_on_drop: false }`
[INFO] [stdout] 6021f04f7bdb00ff6e67e1cc0ad0e5653ab5091f85c9260923ebaeed6a4b0baf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Copt-level=3" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d98a5da813da67eb189387b8ccfb73cf481275d8" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 3f99e53b121feb91128d3ff1690b74643571037d25343d2d5b33d3475079da68
[INFO] running `Command { std: "docker" "start" "-a" "3f99e53b121feb91128d3ff1690b74643571037d25343d2d5b33d3475079da68", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Deserialize` and `Serialize`
[INFO] [stderr]   --> src/main.rs:10:14
[INFO] [stderr]    |
[INFO] [stderr] 10 | use serde::{ Serialize, Deserialize };
[INFO] [stderr]    |              ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Distribution`
[INFO] [stderr]  --> src/main.rs:4:27
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand::distributions::{Distribution};
[INFO] [stderr]   |                           ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rng`
[INFO] [stderr]   --> src/main.rs:57:17
[INFO] [stderr]    |
[INFO] [stderr] 57 |         let mut rng = rand::thread_rng();
[INFO] [stderr]    |                 ^^^ help: if this is intentional, prefix it with an underscore: `_rng`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:57:13
[INFO] [stderr]    |
[INFO] [stderr] 57 |         let mut rng = rand::thread_rng();
[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: `model`
[INFO] [stderr]    --> src/main.rs:426:13
[INFO] [stderr]     |
[INFO] [stderr] 426 |     let mut model = ErrorLoss {
[INFO] [stderr]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `model`
[INFO] [stderr]    --> src/main.rs:440:13
[INFO] [stderr]     |
[INFO] [stderr] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stderr]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_model`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:426:9
[INFO] [stderr]     |
[INFO] [stderr] 426 |     let mut model = ErrorLoss {
[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/main.rs:440:9
[INFO] [stderr]     |
[INFO] [stderr] 440 |     let mut model = ErrorLossFactory::cross_entropy(
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: field `loss_fn` is never read
[INFO] [stderr]    --> src/main.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 155 | struct ErrorLoss<M, FL, FD>
[INFO] [stderr]     |        --------- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 161 |     loss_fn: FL,
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Trainer` is never constructed
[INFO] [stderr]    --> src/main.rs:551:8
[INFO] [stderr]     |
[INFO] [stderr] 551 | struct Trainer<M>
[INFO] [stderr]     |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `my_mnist_network` (bin "my_mnist_network" test) generated 12 warnings (run `cargo fix --bin "my_mnist_network" --tests` to apply 6 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/my_mnist_network-5c06e344c438373d)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "3f99e53b121feb91128d3ff1690b74643571037d25343d2d5b33d3475079da68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f99e53b121feb91128d3ff1690b74643571037d25343d2d5b33d3475079da68", kill_on_drop: false }`
[INFO] [stdout] 3f99e53b121feb91128d3ff1690b74643571037d25343d2d5b33d3475079da68
