[INFO] updating cached repository ther0n/music_sync
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ther0n/music_sync
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ther0n/music_sync" "work/ex/beta-1.37-6/sources/1.36.0/gh/ther0n/music_sync"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/ther0n/music_sync'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ther0n/music_sync" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 51ca6d6b42aa6a4f2a025afde7d24adebcdda1a4
[INFO] sha for GitHub repo ther0n/music_sync: 51ca6d6b42aa6a4f2a025afde7d24adebcdda1a4
[INFO] validating manifest of ther0n/music_sync on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ther0n/music_sync on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ther0n/music_sync
[INFO] finished frobbing ther0n/music_sync
[INFO] frobbed toml for ther0n/music_sync written to work/ex/beta-1.37-6/sources/1.36.0/gh/ther0n/music_sync/Cargo.toml
[INFO] started frobbing ther0n/music_sync
[INFO] finished frobbing ther0n/music_sync
[INFO] frobbed toml for ther0n/music_sync written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync/Cargo.toml
[INFO] crate ther0n/music_sync already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ther0n/music_sync against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] c89f6fd28a51c23660fbc8c641dc709678df04f3232b0eb3fd9fd3823bd0d4b1
[INFO] running `"docker" "start" "-a" "c89f6fd28a51c23660fbc8c641dc709678df04f3232b0eb3fd9fd3823bd0d4b1"`
[INFO] [stderr]    Compiling music_sync v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let mut num_files_pre_scan = num_files_found; // Save the number of files before scan to later display number of new files found with pattern
[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 1.53s
[INFO] running `"docker" "inspect" "c89f6fd28a51c23660fbc8c641dc709678df04f3232b0eb3fd9fd3823bd0d4b1"`
[INFO] running `"docker" "rm" "-f" "c89f6fd28a51c23660fbc8c641dc709678df04f3232b0eb3fd9fd3823bd0d4b1"`
[INFO] [stdout] c89f6fd28a51c23660fbc8c641dc709678df04f3232b0eb3fd9fd3823bd0d4b1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync:/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 994c5b6c99418908069505f985cde69ed2891f6091eec46e9765e5f31665963b
[INFO] running `"docker" "start" "-a" "994c5b6c99418908069505f985cde69ed2891f6091eec46e9765e5f31665963b"`
[INFO] [stderr]    Compiling music_sync v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let mut num_files_pre_scan = num_files_found; // Save the number of files before scan to later display number of new files found with pattern
[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 0.80s
[INFO] running `"docker" "inspect" "994c5b6c99418908069505f985cde69ed2891f6091eec46e9765e5f31665963b"`
[INFO] running `"docker" "rm" "-f" "994c5b6c99418908069505f985cde69ed2891f6091eec46e9765e5f31665963b"`
[INFO] [stdout] 994c5b6c99418908069505f985cde69ed2891f6091eec46e9765e5f31665963b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ther0n/music_sync:/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 2d274182d100c23d2d6af9fb77576cb0342c17642172b2b3c3bd220bdde7521e
[INFO] running `"docker" "start" "-a" "2d274182d100c23d2d6af9fb77576cb0342c17642172b2b3c3bd220bdde7521e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/music_sync-5bd2f121b5562e96
[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" "2d274182d100c23d2d6af9fb77576cb0342c17642172b2b3c3bd220bdde7521e"`
[INFO] running `"docker" "rm" "-f" "2d274182d100c23d2d6af9fb77576cb0342c17642172b2b3c3bd220bdde7521e"`
[INFO] [stdout] 2d274182d100c23d2d6af9fb77576cb0342c17642172b2b3c3bd220bdde7521e