[INFO] updating cached repository FauxFaux/fappa
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/FauxFaux/fappa
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/FauxFaux/fappa" "work/ex/beta-1.38-1/sources/1.37.0/gh/FauxFaux/fappa"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/FauxFaux/fappa'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/FauxFaux/fappa" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FauxFaux/fappa"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FauxFaux/fappa'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b4c15868e2bbefba039758d392ee2918f6b43755
[INFO] sha for GitHub repo FauxFaux/fappa: b4c15868e2bbefba039758d392ee2918f6b43755
[INFO] validating manifest of FauxFaux/fappa 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 FauxFaux/fappa 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 FauxFaux/fappa
[INFO] finished frobbing FauxFaux/fappa
[INFO] frobbed toml for FauxFaux/fappa written to work/ex/beta-1.38-1/sources/1.37.0/gh/FauxFaux/fappa/Cargo.toml
[INFO] started frobbing FauxFaux/fappa
[INFO] finished frobbing FauxFaux/fappa
[INFO] frobbed toml for FauxFaux/fappa written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FauxFaux/fappa/Cargo.toml
[INFO] crate FauxFaux/fappa 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/FauxFaux/reflink`
[INFO] [stderr] error: failed to load source for a dependency on `reflink`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/FauxFaux/reflink?rev=2a7528e1fd25432017b2fe518112e19f4420e46e#2a7528e1
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '2a7528e1fd25432017b2fe518112e19f4420e46e' 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