[INFO] cloning repository 1521350289/study_rust
[INFO] running `"git" "clone" "--bare" "git://github.com/1521350289/study_rust.git" "work/cache/sources/gh/1521350289/study_rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/1521350289/study_rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/1521350289/study_rust" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/1521350289/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/1521350289/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/1521350289/study_rust" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/1521350289/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/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#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to build-fail:broken
[ERROR] caused by: missing Cargo.toml for 1521350289/study_rust
[ERROR]