[INFO] cloning repository https://github.com/gcharnock/neural-network-handwriting
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gcharnock/neural-network-handwriting" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgcharnock%2Fneural-network-handwriting", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgcharnock%2Fneural-network-handwriting'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 14fa3d41a5acbfb979a5bf2bd10b869476659794
[INFO] checking gcharnock/neural-network-handwriting against master#af3c6e733a40e671550e0f0f5aeecaa13772ba56 for pr-74989
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgcharnock%2Fneural-network-handwriting" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gcharnock/neural-network-handwriting on toolchain af3c6e733a40e671550e0f0f5aeecaa13772ba56
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gcharnock/neural-network-handwriting
[INFO] finished tweaking git repo https://github.com/gcharnock/neural-network-handwriting
[INFO] tweaked toml for git repo https://github.com/gcharnock/neural-network-handwriting written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/gcharnock/neural-network-handwriting already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 744a15f5843fd932129c7f9d90debf112f8b13726914911162a06634670c9ca3
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "744a15f5843fd932129c7f9d90debf112f8b13726914911162a06634670c9ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "744a15f5843fd932129c7f9d90debf112f8b13726914911162a06634670c9ca3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "744a15f5843fd932129c7f9d90debf112f8b13726914911162a06634670c9ca3", kill_on_drop: false }`
[INFO] [stdout] 744a15f5843fd932129c7f9d90debf112f8b13726914911162a06634670c9ca3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3b501dec431198c6eac4d221370c871f89179db06712f6e097d7c357c535efbb
[INFO] running `Command { std: "docker" "start" "-a" "3b501dec431198c6eac4d221370c871f89179db06712f6e097d7c357c535efbb", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.40
[INFO] [stderr]     Checking assert_approx_eq v1.0.0
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]     Checking neural_network_handwriting v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0463]: can't find crate for `assert_approx_eq`
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | extern crate assert_approx_eq;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `neural_network_handwriting`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `sigmoid_prime_of_z_l_j`
[INFO] [stdout]    --> src/network.rs:134:21
[INFO] [stdout]     |
[INFO] [stdout] 134 |                 let sigmoid_prime_of_z_l_j = sigmoid_deriv(z[k]);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_sigmoid_prime_of_z_l_j`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `net`
[INFO] [stdout]    --> src/network.rs:414:13
[INFO] [stdout]     |
[INFO] [stdout] 414 |         let net = Network::new(vec![layer0, layer1]);
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_net`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/network.rs:230:17
[INFO] [stdout]     |
[INFO] [stdout] 230 |             let mut prev_activation_errors = &mut front[i];
[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: function is never used: `sigmoid_vec`
[INFO] [stdout]   --> src/network.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn sigmoid_vec<T: Float>(x: &Vec<T>, out: &mut Vec<T>) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `find_d_cost_by_final_activations`
[INFO] [stdout]    --> src/network.rs:241:12
[INFO] [stdout]     |
[INFO] [stdout] 241 |     pub fn find_d_cost_by_final_activations(&mut self, expected: &Vec<T>) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `print`
[INFO] [stdout]   --> src/linear.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 |     fn print(&self) {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3b501dec431198c6eac4d221370c871f89179db06712f6e097d7c357c535efbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b501dec431198c6eac4d221370c871f89179db06712f6e097d7c357c535efbb", kill_on_drop: false }`
[INFO] [stdout] 3b501dec431198c6eac4d221370c871f89179db06712f6e097d7c357c535efbb
