[INFO] fetching crate xgboost 0.1.4...
[INFO] extracting crate xgboost 0.1.4 into work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/xgboost/0.1.4
[INFO] extracting crate xgboost 0.1.4 into work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/xgboost/0.1.4
[INFO] validating manifest of xgboost-0.1.4 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of xgboost-0.1.4 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing xgboost-0.1.4
[INFO] finished frobbing xgboost-0.1.4
[INFO] frobbed toml for xgboost-0.1.4 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/xgboost/0.1.4/Cargo.toml
[INFO] started frobbing xgboost-0.1.4
[INFO] finished frobbing xgboost-0.1.4
[INFO] frobbed toml for xgboost-0.1.4 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/xgboost/0.1.4/Cargo.toml
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded xgboost-sys v0.1.2
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking xgboost-0.1.4 against try#8f81d0bf6baf07b92f1246696722485c4ca0b049 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-3/try#8f81d0bf6baf07b92f1246696722485c4ca0b049:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/xgboost/0.1.4:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 82277ab8fc8ea486dc92a7bffdbf0b1173625c4fab28403aa0874f1e3756ae4f
[INFO] running `"docker" "start" "-a" "82277ab8fc8ea486dc92a7bffdbf0b1173625c4fab28403aa0874f1e3756ae4f"`
[INFO] [stderr]    Compiling env_logger v0.5.13
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling bindgen v0.36.1
[INFO] [stderr]    Compiling xgboost-sys v0.1.2
[INFO] [stderr]     Checking xgboost v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/booster.rs:181:29
[INFO] [stderr]     |
[INFO] [stderr] 181 |                         let mut eval_results = dmat_eval_results.entry(eval_name.to_string())
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/booster.rs:191:29
[INFO] [stderr]     |
[INFO] [stderr] 191 |                         let mut dmat_results = eval_dmat_results.entry(eval_name).or_insert_with(BTreeMap::new);
[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/booster.rs:551:25
[INFO] [stderr]     |
[INFO] [stderr] 551 |                     let mut metric_map = result.entry(evname.to_string()).or_insert_with(IndexMap::new);
[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/booster.rs:181:29
[INFO] [stderr]     |
[INFO] [stderr] 181 |                         let mut eval_results = dmat_eval_results.entry(eval_name.to_string())
[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: variable does not need to be mutable
[INFO] [stderr]    --> src/booster.rs:191:29
[INFO] [stderr]     |
[INFO] [stderr] 191 |                         let mut dmat_results = eval_dmat_results.entry(eval_name).or_insert_with(BTreeMap::new);
[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/booster.rs:551:25
[INFO] [stderr]     |
[INFO] [stderr] 551 |                     let mut metric_map = result.entry(evname.to_string()).or_insert_with(IndexMap::new);
[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/booster.rs:715:13
[INFO] [stderr]     |
[INFO] [stderr] 715 |         let mut dir = tempfile::tempdir().expect("create temp dir");
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3m 08s
[INFO] running `"docker" "inspect" "82277ab8fc8ea486dc92a7bffdbf0b1173625c4fab28403aa0874f1e3756ae4f"`
[INFO] running `"docker" "rm" "-f" "82277ab8fc8ea486dc92a7bffdbf0b1173625c4fab28403aa0874f1e3756ae4f"`
[INFO] [stdout] 82277ab8fc8ea486dc92a7bffdbf0b1173625c4fab28403aa0874f1e3756ae4f