[INFO] updating cached repository keeslinp/decision_tree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/keeslinp/decision_tree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/keeslinp/decision_tree" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/keeslinp/decision_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/keeslinp/decision_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/keeslinp/decision_tree" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/keeslinp/decision_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/keeslinp/decision_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4b4d8633cf8d7560525c874ade61eb67b1e8e651
[INFO] sha for GitHub repo keeslinp/decision_tree: 4b4d8633cf8d7560525c874ade61eb67b1e8e651
[INFO] validating manifest of keeslinp/decision_tree 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 keeslinp/decision_tree 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 keeslinp/decision_tree
[INFO] finished frobbing keeslinp/decision_tree
[INFO] frobbed toml for keeslinp/decision_tree written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/keeslinp/decision_tree/Cargo.toml
[INFO] started frobbing keeslinp/decision_tree
[INFO] finished frobbing keeslinp/decision_tree
[INFO] frobbed toml for keeslinp/decision_tree written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/keeslinp/decision_tree/Cargo.toml
[INFO] crate keeslinp/decision_tree 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 keeslinp/decision_tree against master#452087b4bf18cece2d52d7cd8c9147195e5404bf for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-2/master#452087b4bf18cece2d52d7cd8c9147195e5404bf:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/keeslinp/decision_tree:/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] 347244e28543e3ca06bf7635cf8347af6a430476ba72d0b0ec3444423dcb5da9
[INFO] running `"docker" "start" "-a" "347244e28543e3ca06bf7635cf8347af6a430476ba72d0b0ec3444423dcb5da9"`
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking decision_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `test_accuracy`
[INFO] [stderr]    --> src/decision.rs:146:17
[INFO] [stderr]     |
[INFO] [stderr] 146 |             let test_accuracy = self.test_set(training);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_test_accuracy`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `test_accuracy`
[INFO] [stderr]    --> src/decision.rs:146:17
[INFO] [stderr]     |
[INFO] [stderr] 146 |             let test_accuracy = self.test_set(training);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_test_accuracy`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_pruned_nodes`
[INFO] [stderr]    --> src/decision.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     pub fn count_pruned_nodes(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `count_pruned_nodes`
[INFO] [stderr]    --> src/decision.rs:288:5
[INFO] [stderr]     |
[INFO] [stderr] 288 |     pub fn count_pruned_nodes(&self) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.20s
[INFO] running `"docker" "inspect" "347244e28543e3ca06bf7635cf8347af6a430476ba72d0b0ec3444423dcb5da9"`
[INFO] running `"docker" "rm" "-f" "347244e28543e3ca06bf7635cf8347af6a430476ba72d0b0ec3444423dcb5da9"`
[INFO] [stdout] 347244e28543e3ca06bf7635cf8347af6a430476ba72d0b0ec3444423dcb5da9