[INFO] updating cached repository Woyten/image-util
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Woyten/image-util
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Woyten/image-util" "work/ex/beta-1.38-1/sources/1.37.0/gh/Woyten/image-util"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Woyten/image-util'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Woyten/image-util" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Woyten/image-util"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Woyten/image-util'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3bb80c514076a3cec58c7c63f1ba5908a1154495
[INFO] sha for GitHub repo Woyten/image-util: 3bb80c514076a3cec58c7c63f1ba5908a1154495
[INFO] validating manifest of Woyten/image-util 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 Woyten/image-util 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 Woyten/image-util
[INFO] finished frobbing Woyten/image-util
[INFO] frobbed toml for Woyten/image-util written to work/ex/beta-1.38-1/sources/1.37.0/gh/Woyten/image-util/Cargo.toml
[INFO] started frobbing Woyten/image-util
[INFO] finished frobbing Woyten/image-util
[INFO] frobbed toml for Woyten/image-util written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Woyten/image-util/Cargo.toml
[INFO] crate Woyten/image-util 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/Woyten/math-util.git`
[INFO] [stderr] error: failed to load source for a dependency on `math-util`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/Woyten/math-util.git#7fbe31ac
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '7fbe31ac818140590b405fa6f4d497e021d2ad82' not found; class=Reference (4); code=NotFound (-3)
[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