[INFO] updating cached repository sgp715/word_frequencies
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sgp715/word_frequencies
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sgp715/word_frequencies" "work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sgp715/word_frequencies" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgp715/word_frequencies"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgp715/word_frequencies'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2f9a9111e36616f2ceffd044f16a80c15b18b05a
[INFO] sha for GitHub repo sgp715/word_frequencies: 2f9a9111e36616f2ceffd044f16a80c15b18b05a
[INFO] validating manifest of sgp715/word_frequencies 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 sgp715/word_frequencies 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 sgp715/word_frequencies
[INFO] finished frobbing sgp715/word_frequencies
[INFO] frobbed toml for sgp715/word_frequencies written to work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies/Cargo.toml
[INFO] started frobbing sgp715/word_frequencies
[INFO] finished frobbing sgp715/word_frequencies
[INFO] frobbed toml for sgp715/word_frequencies written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sgp715/word_frequencies/Cargo.toml
[INFO] crate sgp715/word_frequencies already has a lockfile, it will not be regenerated
[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] testing sgp715/word_frequencies 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies:/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] bdda02ef9d602af2d2c50a4f86fd3afe3a69b9c36ab0a7bc6ad82489d47e752d
[INFO] running `"docker" "start" "-a" "bdda02ef9d602af2d2c50a4f86fd3afe3a69b9c36ab0a7bc6ad82489d47e752d"`
[INFO] [stderr]    Compiling hw1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |         let mut split_line = line.split(" ");
[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 1.72s
[INFO] running `"docker" "inspect" "bdda02ef9d602af2d2c50a4f86fd3afe3a69b9c36ab0a7bc6ad82489d47e752d"`
[INFO] running `"docker" "rm" "-f" "bdda02ef9d602af2d2c50a4f86fd3afe3a69b9c36ab0a7bc6ad82489d47e752d"`
[INFO] [stdout] bdda02ef9d602af2d2c50a4f86fd3afe3a69b9c36ab0a7bc6ad82489d47e752d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies:/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] 2c5e1dbc000d21705d850b2e8df2ef8eaf00036b090ecb65669285940310d0da
[INFO] running `"docker" "start" "-a" "2c5e1dbc000d21705d850b2e8df2ef8eaf00036b090ecb65669285940310d0da"`
[INFO] [stderr]    Compiling hw1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:41:13
[INFO] [stderr]    |
[INFO] [stderr] 41 |         let mut split_line = line.split(" ");
[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: function is never used: `blank`
[INFO] [stderr]    --> src/main.rs:190:9
[INFO] [stderr]     |
[INFO] [stderr] 190 |         fn blank() {
[INFO] [stderr]     |         ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.49s
[INFO] running `"docker" "inspect" "2c5e1dbc000d21705d850b2e8df2ef8eaf00036b090ecb65669285940310d0da"`
[INFO] running `"docker" "rm" "-f" "2c5e1dbc000d21705d850b2e8df2ef8eaf00036b090ecb65669285940310d0da"`
[INFO] [stdout] 2c5e1dbc000d21705d850b2e8df2ef8eaf00036b090ecb65669285940310d0da
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/sgp715/word_frequencies:/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] 63c3bc76fb92df980f5c959600678a6592d9382162275f5c55c5b22d3c692508
[INFO] running `"docker" "start" "-a" "63c3bc76fb92df980f5c959600678a6592d9382162275f5c55c5b22d3c692508"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/hw1-78a104612f0f6820
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test cleaned_words_tests::blank ... ok
[INFO] [stdout] test count_frequencies_tests::blank ... ok
[INFO] [stdout] test cleaned_words_tests::punctuation ... ok
[INFO] [stdout] test cleaned_words_tests::basic ... ok
[INFO] [stdout] test count_frequencies_tests::count ... ok
[INFO] [stdout] test read_words_tests::reads ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "63c3bc76fb92df980f5c959600678a6592d9382162275f5c55c5b22d3c692508"`
[INFO] running `"docker" "rm" "-f" "63c3bc76fb92df980f5c959600678a6592d9382162275f5c55c5b22d3c692508"`
[INFO] [stdout] 63c3bc76fb92df980f5c959600678a6592d9382162275f5c55c5b22d3c692508