[INFO] updating cached repository farnoy/renderer
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/farnoy/renderer
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/farnoy/renderer" "work/ex/beta-1.38-1/sources/1.37.0/gh/farnoy/renderer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/farnoy/renderer'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/farnoy/renderer" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/farnoy/renderer"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/farnoy/renderer'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f9ef0707696b8dea3811324800c347b6259f5987
[INFO] sha for GitHub repo farnoy/renderer: f9ef0707696b8dea3811324800c347b6259f5987
[INFO] validating manifest of farnoy/renderer 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 farnoy/renderer 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 farnoy/renderer
[INFO] finished frobbing farnoy/renderer
[INFO] frobbed toml for farnoy/renderer written to work/ex/beta-1.38-1/sources/1.37.0/gh/farnoy/renderer/Cargo.toml
[INFO] started frobbing farnoy/renderer
[INFO] finished frobbing farnoy/renderer
[INFO] frobbed toml for farnoy/renderer written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/farnoy/renderer/Cargo.toml
[INFO] crate farnoy/renderer 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/farnoy/specs`
[INFO] [stderr] error: failed to load source for a dependency on `specs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/farnoy/specs#b21fb414
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to fetch into /mnt/big/crater/work/local/cargo-home/git/db/specs-0b525195ab7bcebc
[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