[INFO] cloning repository kitty-lang/shedder
[INFO] running `"git" "clone" "--bare" "git://github.com/kitty-lang/shedder.git" "work/cache/sources/gh/kitty-lang/shedder"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/kitty-lang/shedder'...
[INFO] running `"git" "clone" "work/cache/sources/gh/kitty-lang/shedder" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/kitty-lang/shedder"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/kitty-lang/shedder'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kitty-lang/shedder" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/kitty-lang/shedder"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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 master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kitty-lang/shedder on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "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/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/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/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/kitty-lang/shedder/Cargo.toml
[INFO] crate kitty-lang/shedder already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "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/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed