[INFO] cloning repository robbystk/rust-by-the-book
[INFO] running `"git" "clone" "--bare" "git://github.com/robbystk/rust-by-the-book.git" "work/cache/sources/gh/robbystk/rust-by-the-book"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/robbystk/rust-by-the-book'...
[INFO] running `"git" "clone" "work/cache/sources/gh/robbystk/rust-by-the-book" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/robbystk/rust-by-the-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/robbystk/rust-by-the-book'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/robbystk/rust-by-the-book" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/robbystk/rust-by-the-book"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/robbystk/rust-by-the-book'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b7b31e5df56131e49ded651ae19906ad0443a5e5
[INFO] sha for GitHub repo robbystk/rust-by-the-book: b7b31e5df56131e49ded651ae19906ad0443a5e5
[INFO] validating manifest of robbystk/rust-by-the-book 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 robbystk/rust-by-the-book
[ERROR]