[INFO] updating cached repository lucarlig/rust_challenges
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lucarlig/rust_challenges
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lucarlig/rust_challenges" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/lucarlig/rust_challenges"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/lucarlig/rust_challenges'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lucarlig/rust_challenges" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/lucarlig/rust_challenges"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/lucarlig/rust_challenges'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f46d818520a830f7dd27769884242a5799126371
[INFO] sha for GitHub repo lucarlig/rust_challenges: f46d818520a830f7dd27769884242a5799126371
[INFO] validating manifest of lucarlig/rust_challenges on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to build-fail:broken
[ERROR] caused by: missing Cargo.toml for lucarlig/rust_challenges
[ERROR]