[INFO] updating cached repository appcypher/viper
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/appcypher/viper
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/appcypher/viper" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/appcypher/viper"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/appcypher/viper'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/appcypher/viper" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/appcypher/viper"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/appcypher/viper'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4619081bbab9c153602a3e9c7e8f8b8fe81d25fe
[INFO] sha for GitHub repo appcypher/viper: 4619081bbab9c153602a3e9c7e8f8b8fe81d25fe
[INFO] validating manifest of appcypher/viper on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:cargo-toml
[ERROR] caused by: missing Cargo.toml for appcypher/viper
[ERROR]