[INFO] crate randomforests 0.1.1 is already in cache
[INFO] extracting crate randomforests 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/randomforests/0.1.1
[INFO] extracting crate randomforests 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/randomforests/0.1.1
[INFO] validating manifest of randomforests-0.1.1 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of randomforests-0.1.1 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing randomforests-0.1.1
[INFO] finished frobbing randomforests-0.1.1
[INFO] frobbed toml for randomforests-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/randomforests/0.1.1/Cargo.toml
[INFO] started frobbing randomforests-0.1.1
[INFO] finished frobbing randomforests-0.1.1
[INFO] frobbed toml for randomforests-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/randomforests/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing randomforests-0.1.1 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/randomforests/0.1.1:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 734d4a0df2c50e309c6454a1452a2aa535d56168d18136a9e4a69c5e81fd2fb3
[INFO] running `"docker" "start" "-a" "734d4a0df2c50e309c6454a1452a2aa535d56168d18136a9e4a69c5e81fd2fb3"`
[INFO] [stderr]    Compiling randomforests v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]    --> src/lib.rs:382:13
[INFO] [stderr]     |
[INFO] [stderr] 382 |         for n in 0..num_trees {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:122:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |     for mut item in data.into_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]     Finished dev [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `"docker" "inspect" "734d4a0df2c50e309c6454a1452a2aa535d56168d18136a9e4a69c5e81fd2fb3"`
[INFO] running `"docker" "rm" "-f" "734d4a0df2c50e309c6454a1452a2aa535d56168d18136a9e4a69c5e81fd2fb3"`
[INFO] [stdout] 734d4a0df2c50e309c6454a1452a2aa535d56168d18136a9e4a69c5e81fd2fb3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/randomforests/0.1.1:/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=warn" "-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] aa0319e42f3cd2c911debfe4579127ac5ea595a546507530560ab5abb5b85864
[INFO] running `"docker" "start" "-a" "aa0319e42f3cd2c911debfe4579127ac5ea595a546507530560ab5abb5b85864"`
[INFO] [stderr]    Compiling randomforests v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]    --> src/lib.rs:382:13
[INFO] [stderr]     |
[INFO] [stderr] 382 |         for n in 0..num_trees {
[INFO] [stderr]     |             ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:122:9
[INFO] [stderr]     |
[INFO] [stderr] 122 |     for mut item in data.into_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]     Finished dev [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `"docker" "inspect" "aa0319e42f3cd2c911debfe4579127ac5ea595a546507530560ab5abb5b85864"`
[INFO] running `"docker" "rm" "-f" "aa0319e42f3cd2c911debfe4579127ac5ea595a546507530560ab5abb5b85864"`
[INFO] [stdout] aa0319e42f3cd2c911debfe4579127ac5ea595a546507530560ab5abb5b85864
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/randomforests/0.1.1:/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=warn" "-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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 704a140b3e412ec413313062a487d4608ad687dc32faac008aa05b9c57bd9c6f
[INFO] running `"docker" "start" "-a" "704a140b3e412ec413313062a487d4608ad687dc32faac008aa05b9c57bd9c6f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/randomforests-e873a57b9c7e36de
[INFO] [stdout] 
[INFO] [stdout] running 12 tests
[INFO] [stdout] test test_decisiontree::decision_less_mincount ... ok
[INFO] [stdout] test test_dataset::unique ... ok
[INFO] [stdout] test test_decisiontree::decision_more_mincount ... ok
[INFO] [stdout] test test_dataset::test_sample ... ok
[INFO] [stdout] test test_dataset::most_frequent ... ok
[INFO] [stdout] test test_cacheentry::equal_entries_identity ... ok
[INFO] [stdout] test test_cacheentry::equal_entries_hash ... ok
[INFO] [stdout] test test_cacheentry::diff_entries_identity ... ok
[INFO] [stdout] test test_treeconfig::create_empty_defaults ... ok
[INFO] [stdout] test test_cacheentry::diff_entries_hash ... ok
[INFO] [stdout] test test_decisiontree::decision_prediction ... ok
[INFO] [stdout] test test_randomforest::forest_prediction ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stderr]    Doc-tests randomforests
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "704a140b3e412ec413313062a487d4608ad687dc32faac008aa05b9c57bd9c6f"`
[INFO] running `"docker" "rm" "-f" "704a140b3e412ec413313062a487d4608ad687dc32faac008aa05b9c57bd9c6f"`
[INFO] [stdout] 704a140b3e412ec413313062a487d4608ad687dc32faac008aa05b9c57bd9c6f