[INFO] updating cached repository lazear/rust-kmeans
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lazear/rust-kmeans
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lazear/rust-kmeans" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/lazear/rust-kmeans"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/lazear/rust-kmeans'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lazear/rust-kmeans" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/lazear/rust-kmeans"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/lazear/rust-kmeans'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 875af42f47cf62e74272cc594b8745ada781aae2
[INFO] sha for GitHub repo lazear/rust-kmeans: 875af42f47cf62e74272cc594b8745ada781aae2
[INFO] validating manifest of lazear/rust-kmeans on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lazear/rust-kmeans on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lazear/rust-kmeans
[INFO] finished frobbing lazear/rust-kmeans
[INFO] frobbed toml for lazear/rust-kmeans written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/lazear/rust-kmeans/Cargo.toml
[INFO] started frobbing lazear/rust-kmeans
[INFO] finished frobbing lazear/rust-kmeans
[INFO] frobbed toml for lazear/rust-kmeans written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/lazear/rust-kmeans/Cargo.toml
[INFO] crate lazear/rust-kmeans already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking lazear/rust-kmeans against master#452087b4bf18cece2d52d7cd8c9147195e5404bf for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-7/master#452087b4bf18cece2d52d7cd8c9147195e5404bf:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/lazear/rust-kmeans:/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" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] b30b9f1c611e3a19660570b0abb888cb46b2ebb93c03c851410248c57b95750c
[INFO] running `"docker" "start" "-a" "b30b9f1c611e3a19660570b0abb888cb46b2ebb93c03c851410248c57b95750c"`
[INFO] [stderr]     Checking spreadsheet v0.1.0 (https://github.com/lazear/spreadsheet.git#5fc986b1)
[INFO] [stderr]     Checking rand v0.3.16
[INFO] [stderr]     Checking rust-kmeans v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let i = mutex.lock().unwrap();
[INFO] [stderr]     |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:125:9
[INFO] [stderr]     |
[INFO] [stderr] 125 |     let i = mutex.lock().unwrap();
[INFO] [stderr]     |         ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:156:21
[INFO] [stderr]     |
[INFO] [stderr] 156 |     while let Some((i, row)) = enumerate.next() {
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/main.rs:156:21
[INFO] [stderr]     |
[INFO] [stderr] 156 |     while let Some((i, row)) = enumerate.next() {
[INFO] [stderr]     |                     ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `K` should have a snake case name
[INFO] [stderr]    --> src/main.rs:205:9
[INFO] [stderr]     |
[INFO] [stderr] 205 |     for K in 1..6 {
[INFO] [stderr]     |         ^ help: convert the identifier to snake case: `k`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `K` should have a snake case name
[INFO] [stderr]    --> src/main.rs:205:9
[INFO] [stderr]     |
[INFO] [stderr] 205 |     for K in 1..6 {
[INFO] [stderr]     |         ^ help: convert the identifier to snake case: `k`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.31s
[INFO] running `"docker" "inspect" "b30b9f1c611e3a19660570b0abb888cb46b2ebb93c03c851410248c57b95750c"`
[INFO] running `"docker" "rm" "-f" "b30b9f1c611e3a19660570b0abb888cb46b2ebb93c03c851410248c57b95750c"`
[INFO] [stdout] b30b9f1c611e3a19660570b0abb888cb46b2ebb93c03c851410248c57b95750c