[INFO] updating cached repository lukesteensen/cassandra-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lukesteensen/cassandra-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lukesteensen/cassandra-rs" "work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/lukesteensen/cassandra-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/lukesteensen/cassandra-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lukesteensen/cassandra-rs" "work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/gh/lukesteensen/cassandra-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/gh/lukesteensen/cassandra-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 535972392f689c2d85ec0b5ce5c214b5f938af93
[INFO] sha for GitHub repo lukesteensen/cassandra-rs: 535972392f689c2d85ec0b5ce5c214b5f938af93
[INFO] validating manifest of lukesteensen/cassandra-rs on toolchain master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lukesteensen/cassandra-rs on toolchain try#18481b65f318e0b4b20c0fc61340054701719d6c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lukesteensen/cassandra-rs
[INFO] finished frobbing lukesteensen/cassandra-rs
[INFO] frobbed toml for lukesteensen/cassandra-rs written to work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/lukesteensen/cassandra-rs/Cargo.toml
[INFO] started frobbing lukesteensen/cassandra-rs
[INFO] finished frobbing lukesteensen/cassandra-rs
[INFO] frobbed toml for lukesteensen/cassandra-rs written to work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/gh/lukesteensen/cassandra-rs/Cargo.toml
[INFO] crate lukesteensen/cassandra-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/lukesteensen/byteorder`
[INFO] [stderr] error: failed to load source for a dependency on `byteorder`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/lukesteensen/byteorder?branch=read_exact#7a605768
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '7a605768b98fbdbc00e700ea4d3707722e672ee2' 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" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed