[INFO] updating cached repository olson-dan/rustzork
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/olson-dan/rustzork
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/olson-dan/rustzork" "work/ex/beta-1.38-1/sources/1.37.0/gh/olson-dan/rustzork"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/olson-dan/rustzork'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/olson-dan/rustzork" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olson-dan/rustzork"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olson-dan/rustzork'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db2b7398262a3e523ddf53a3864abc5f70e9aca0
[INFO] sha for GitHub repo olson-dan/rustzork: db2b7398262a3e523ddf53a3864abc5f70e9aca0
[INFO] validating manifest of olson-dan/rustzork 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 olson-dan/rustzork 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 olson-dan/rustzork
[INFO] finished frobbing olson-dan/rustzork
[INFO] frobbed toml for olson-dan/rustzork written to work/ex/beta-1.38-1/sources/1.37.0/gh/olson-dan/rustzork/Cargo.toml
[INFO] started frobbing olson-dan/rustzork
[INFO] finished frobbing olson-dan/rustzork
[INFO] frobbed toml for olson-dan/rustzork written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/olson-dan/rustzork/Cargo.toml
[INFO] crate olson-dan/rustzork 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/rust-lang-nursery/rand`
[INFO] [stderr] error: failed to load source for a dependency on `rand`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/rust-lang-nursery/rand#85ceba8d
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '85ceba8d82e35a591717824c40bca26120856ae3' 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