[INFO] updating cached repository kitty-lang/shedder
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kitty-lang/shedder
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kitty-lang/shedder" "work/ex/beta-1.38-1/sources/1.37.0/gh/kitty-lang/shedder"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kitty-lang/shedder'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kitty-lang/shedder" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kitty-lang/shedder"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kitty-lang/shedder'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5cb38e878682b9c0b9f283bc4c54fe636e4e9019
[INFO] sha for GitHub repo kitty-lang/shedder: 5cb38e878682b9c0b9f283bc4c54fe636e4e9019
[INFO] validating manifest of kitty-lang/shedder 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 kitty-lang/shedder 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 kitty-lang/shedder
[INFO] finished frobbing kitty-lang/shedder
[INFO] frobbed toml for kitty-lang/shedder written to work/ex/beta-1.38-1/sources/1.37.0/gh/kitty-lang/shedder/Cargo.toml
[INFO] started frobbing kitty-lang/shedder
[INFO] finished frobbing kitty-lang/shedder
[INFO] frobbed toml for kitty-lang/shedder written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kitty-lang/shedder/Cargo.toml
[INFO] crate kitty-lang/shedder 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/TheDan64/inkwell`
[INFO] [stderr] error: failed to load source for a dependency on `inkwell`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/TheDan64/inkwell?branch=llvm7-0#3d76e55a
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '3d76e55abb9080f771075006633748d5b0730afb' 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