[INFO] updating cached repository timboe/rust_perceptron
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/timboe/rust_perceptron
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/timboe/rust_perceptron" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/timboe/rust_perceptron"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/timboe/rust_perceptron'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/timboe/rust_perceptron" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/timboe/rust_perceptron"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/timboe/rust_perceptron'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f65e03d5250d4be622afffecb756a973efaf7bf2
[INFO] sha for GitHub repo timboe/rust_perceptron: f65e03d5250d4be622afffecb756a973efaf7bf2
[INFO] validating manifest of timboe/rust_perceptron on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of timboe/rust_perceptron on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing timboe/rust_perceptron
[INFO] finished frobbing timboe/rust_perceptron
[INFO] frobbed toml for timboe/rust_perceptron written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/timboe/rust_perceptron/Cargo.toml
[INFO] started frobbing timboe/rust_perceptron
[INFO] finished frobbing timboe/rust_perceptron
[INFO] frobbed toml for timboe/rust_perceptron written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/timboe/rust_perceptron/Cargo.toml
[INFO] crate timboe/rust_perceptron already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking timboe/rust_perceptron against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-0/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/timboe/rust_perceptron:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-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" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 4d85dd9bc9679d3e6620e3b9c003b2e13f1181ed5a29331861a012a1c1842d8a
[INFO] running `"docker" "start" "-a" "4d85dd9bc9679d3e6620e3b9c003b2e13f1181ed5a29331861a012a1c1842d8a"`
[INFO] [stderr]     Checking mnist v0.4.0
[INFO] [stderr]     Checking rulinalg v0.4.2
[INFO] [stderr]     Checking mindtree_utils v0.4.0
[INFO] [stderr]     Checking rust_perceptron v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `cost`
[INFO] [stderr]    --> src/main.rs:243:13
[INFO] [stderr]     |
[INFO] [stderr] 243 |         let cost = network.apply(&mut response, answers.get(label).unwrap());
[INFO] [stderr]     |             ^^^^ help: consider prefixing with an underscore: `_cost`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vertex`
[INFO] [stderr]    --> src/main.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |     for (index, vertex) in self.layers.iter().enumerate() {
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_vertex`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:150:9
[INFO] [stderr]     |
[INFO] [stderr] 150 |     let mut iter = response.get_output_layer().iter().zip( answer.iter() );
[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: method is never used: `as_ref`
[INFO] [stderr]    --> src/main.rs:170:3
[INFO] [stderr]     |
[INFO] [stderr] 170 |   pub fn as_ref(&self) -> &Vector<f32> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_ref`
[INFO] [stderr]    --> src/main.rs:185:3
[INFO] [stderr]     |
[INFO] [stderr] 185 |   pub fn as_ref(&self) -> &Matrix<f32> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cost`
[INFO] [stderr]    --> src/main.rs:243:13
[INFO] [stderr]     |
[INFO] [stderr] 243 |         let cost = network.apply(&mut response, answers.get(label).unwrap());
[INFO] [stderr]     |             ^^^^ help: consider prefixing with an underscore: `_cost`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `vertex`
[INFO] [stderr]    --> src/main.rs:128:17
[INFO] [stderr]     |
[INFO] [stderr] 128 |     for (index, vertex) in self.layers.iter().enumerate() {
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_vertex`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:150:9
[INFO] [stderr]     |
[INFO] [stderr] 150 |     let mut iter = response.get_output_layer().iter().zip( answer.iter() );
[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: method is never used: `as_ref`
[INFO] [stderr]    --> src/main.rs:170:3
[INFO] [stderr]     |
[INFO] [stderr] 170 |   pub fn as_ref(&self) -> &Vector<f32> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_ref`
[INFO] [stderr]    --> src/main.rs:185:3
[INFO] [stderr]     |
[INFO] [stderr] 185 |   pub fn as_ref(&self) -> &Matrix<f32> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.00s
[INFO] running `"docker" "inspect" "4d85dd9bc9679d3e6620e3b9c003b2e13f1181ed5a29331861a012a1c1842d8a"`
[INFO] running `"docker" "rm" "-f" "4d85dd9bc9679d3e6620e3b9c003b2e13f1181ed5a29331861a012a1c1842d8a"`
[INFO] [stdout] 4d85dd9bc9679d3e6620e3b9c003b2e13f1181ed5a29331861a012a1c1842d8a