[INFO] updating cached repository cstorey/chain-replication-experiment
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cstorey/chain-replication-experiment
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cstorey/chain-replication-experiment" "work/ex/beta-1.38-1/sources/1.37.0/gh/cstorey/chain-replication-experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cstorey/chain-replication-experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cstorey/chain-replication-experiment" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cstorey/chain-replication-experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cstorey/chain-replication-experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 88e8dae6fcea0a14e7086ca9296b9343dfe425f5
[INFO] sha for GitHub repo cstorey/chain-replication-experiment: 88e8dae6fcea0a14e7086ca9296b9343dfe425f5
[INFO] validating manifest of cstorey/chain-replication-experiment 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 cstorey/chain-replication-experiment 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 cstorey/chain-replication-experiment
[INFO] finished frobbing cstorey/chain-replication-experiment
[INFO] frobbed toml for cstorey/chain-replication-experiment written to work/ex/beta-1.38-1/sources/1.37.0/gh/cstorey/chain-replication-experiment/Cargo.toml
[INFO] started frobbing cstorey/chain-replication-experiment
[INFO] finished frobbing cstorey/chain-replication-experiment
[INFO] frobbed toml for cstorey/chain-replication-experiment written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cstorey/chain-replication-experiment/Cargo.toml
[INFO] crate cstorey/chain-replication-experiment 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/cstorey/tokio-proto`
[INFO] [stderr] error: failed to load source for a dependency on `tokio-proto`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/cstorey/tokio-proto#e52b0858
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec 'e52b08588a0e427fd2c1dfccae1c9718215d537c' 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