[INFO] updating cached repository kennytm/distributed-lock-sample
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kennytm/distributed-lock-sample
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kennytm/distributed-lock-sample" "work/ex/beta-1.38-1/sources/1.37.0/gh/kennytm/distributed-lock-sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kennytm/distributed-lock-sample'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kennytm/distributed-lock-sample" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kennytm/distributed-lock-sample"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kennytm/distributed-lock-sample'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5277c3357c914c4b8901b5f1d1e2bb9de1b65328
[INFO] sha for GitHub repo kennytm/distributed-lock-sample: 5277c3357c914c4b8901b5f1d1e2bb9de1b65328
[INFO] validating manifest of kennytm/distributed-lock-sample 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 kennytm/distributed-lock-sample 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 kennytm/distributed-lock-sample
[INFO] finished frobbing kennytm/distributed-lock-sample
[INFO] frobbed toml for kennytm/distributed-lock-sample written to work/ex/beta-1.38-1/sources/1.37.0/gh/kennytm/distributed-lock-sample/Cargo.toml
[INFO] started frobbing kennytm/distributed-lock-sample
[INFO] finished frobbing kennytm/distributed-lock-sample
[INFO] frobbed toml for kennytm/distributed-lock-sample written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kennytm/distributed-lock-sample/Cargo.toml
[INFO] crate kennytm/distributed-lock-sample 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/kennytm/etcd-rs.git`
[INFO] [stderr] error: failed to load source for a dependency on `etcd-rs`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/kennytm/etcd-rs.git?branch=lock-api#984302de
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '984302dedc29954fa0e7c203434db47829762f09' 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