[INFO] cloning repository mpgarate/rust-fifteen-puzzle
[INFO] running `"git" "clone" "--bare" "git://github.com/mpgarate/rust-fifteen-puzzle.git" "work/cache/sources/gh/mpgarate/rust-fifteen-puzzle"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/mpgarate/rust-fifteen-puzzle'...
[INFO] running `"git" "clone" "work/cache/sources/gh/mpgarate/rust-fifteen-puzzle" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mpgarate/rust-fifteen-puzzle"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mpgarate/rust-fifteen-puzzle'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mpgarate/rust-fifteen-puzzle" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mpgarate/rust-fifteen-puzzle"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mpgarate/rust-fifteen-puzzle'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ecc1c4e0f50d6d7197aac0e18cc619f2fff226db
[INFO] sha for GitHub repo mpgarate/rust-fifteen-puzzle: ecc1c4e0f50d6d7197aac0e18cc619f2fff226db
[INFO] validating manifest of mpgarate/rust-fifteen-puzzle 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 mpgarate/rust-fifteen-puzzle 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 mpgarate/rust-fifteen-puzzle
[INFO] finished frobbing mpgarate/rust-fifteen-puzzle
[INFO] frobbed toml for mpgarate/rust-fifteen-puzzle written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mpgarate/rust-fifteen-puzzle/Cargo.toml
[INFO] started frobbing mpgarate/rust-fifteen-puzzle
[INFO] finished frobbing mpgarate/rust-fifteen-puzzle
[INFO] frobbed toml for mpgarate/rust-fifteen-puzzle written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/mpgarate/rust-fifteen-puzzle/Cargo.toml
[INFO] crate mpgarate/rust-fifteen-puzzle already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/passcod/cargo-watch`
[INFO] [stderr] error: the lock file /mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/mpgarate/rust-fifteen-puzzle/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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] [stderr]     Updating git repository `https://github.com/passcod/cargo-watch`
[INFO] [stderr] error: failed to load source for a dependency on `cargo-watch`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/passcod/cargo-watch
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to find branch `master`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   cannot locate local branch 'master'; class=Reference (4); code=NotFound (-3)
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed