[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-1.38-1/sources/1.37.0/gh/ther0n/music_sync"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ther0n/music_sync'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ther0n/music_sync" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ther0n/music_sync"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ther0n/music_sync 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 ther0n/music_sync
[INFO] finished frobbing ther0n/music_sync
[INFO] frobbed toml for ther0n/music_sync written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 ther0n/music_sync 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/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 4c99d294f7d7667418c1bb73ab0273f57d940240fc84f5dfea69ea4ebacf9234
[INFO] running `"docker" "start" "-a" "4c99d294f7d7667418c1bb73ab0273f57d940240fc84f5dfea69ea4ebacf9234"`
[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 1.62s
[INFO] running `"docker" "inspect" "4c99d294f7d7667418c1bb73ab0273f57d940240fc84f5dfea69ea4ebacf9234"`
[INFO] running `"docker" "rm" "-f" "4c99d294f7d7667418c1bb73ab0273f57d940240fc84f5dfea69ea4ebacf9234"`
[INFO] [stdout] 4c99d294f7d7667418c1bb73ab0273f57d940240fc84f5dfea69ea4ebacf9234
[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/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 088654a0e29e50919cc6f298a5d068c25edcea9c1d0a8ad7731492712329d6b1
[INFO] running `"docker" "start" "-a" "088654a0e29e50919cc6f298a5d068c25edcea9c1d0a8ad7731492712329d6b1"`
[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" "088654a0e29e50919cc6f298a5d068c25edcea9c1d0a8ad7731492712329d6b1"`
[INFO] running `"docker" "rm" "-f" "088654a0e29e50919cc6f298a5d068c25edcea9c1d0a8ad7731492712329d6b1"`
[INFO] [stdout] 088654a0e29e50919cc6f298a5d068c25edcea9c1d0a8ad7731492712329d6b1
[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/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 3222bea5bde294f8f3049f9fb776dc683d8f5c9946f0baf0fadf2ce9238762aa
[INFO] running `"docker" "start" "-a" "3222bea5bde294f8f3049f9fb776dc683d8f5c9946f0baf0fadf2ce9238762aa"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/music_sync-850a85467723df2c
[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" "3222bea5bde294f8f3049f9fb776dc683d8f5c9946f0baf0fadf2ce9238762aa"`
[INFO] running `"docker" "rm" "-f" "3222bea5bde294f8f3049f9fb776dc683d8f5c9946f0baf0fadf2ce9238762aa"`
[INFO] [stdout] 3222bea5bde294f8f3049f9fb776dc683d8f5c9946f0baf0fadf2ce9238762aa