[INFO] updating cached repository bvssvni/ld31
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bvssvni/ld31
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bvssvni/ld31" "work/ex/beta-1.38-1/sources/1.37.0/gh/bvssvni/ld31"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bvssvni/ld31'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bvssvni/ld31" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bvssvni/ld31"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bvssvni/ld31'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ed390bf83fd002b0f938186404e6a185602c5553
[INFO] sha for GitHub repo bvssvni/ld31: ed390bf83fd002b0f938186404e6a185602c5553
[INFO] validating manifest of bvssvni/ld31 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 bvssvni/ld31 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 bvssvni/ld31
[INFO] finished frobbing bvssvni/ld31
[INFO] frobbed toml for bvssvni/ld31 written to work/ex/beta-1.38-1/sources/1.37.0/gh/bvssvni/ld31/Cargo.toml
[INFO] started frobbing bvssvni/ld31
[INFO] finished frobbing bvssvni/ld31
[INFO] frobbed toml for bvssvni/ld31 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bvssvni/ld31/Cargo.toml
[INFO] crate bvssvni/ld31 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] [stderr]     Updating git repository `https://github.com/pistondevelopers/event`
[INFO] [stderr] error: failed to load source for a dependency on `pistoncore-event`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/pistondevelopers/event#89abc7c6
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to fetch into /mnt/big/crater/work/local/cargo-home/git/db/event-dedf5ad125ed649a
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to authenticate when downloading repository
[INFO] [stderr] attempted to find username/password via git's `credential.helper` support, but failed
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to acquire username/password from local configuration
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed