[INFO] updating cached repository 1521350289/study_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/1521350289/study_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/1521350289/study_rust" "work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/1521350289/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504/gh/1521350289/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/1521350289/study_rust" "work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/1521350289/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61100/sources/try#58b21121d0b447ceb3f1a655155d802191acf044/gh/1521350289/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 465080aa0100858ccb32b76f8b7c01238594347a
[INFO] sha for GitHub repo 1521350289/study_rust: 465080aa0100858ccb32b76f8b7c01238594347a
[INFO] validating manifest of 1521350289/study_rust on toolchain master#8869ee03d7f258e1b76a11c6fbb01b5708a9f504
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:cargo-toml
[ERROR] caused by: missing Cargo.toml for 1521350289/study_rust
[ERROR]