[INFO] cloning repository timmc/cavern
[INFO] running `"git" "clone" "--bare" "git://github.com/timmc/cavern.git" "work/cache/sources/gh/timmc/cavern"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/timmc/cavern'...
[INFO] running `"git" "clone" "work/cache/sources/gh/timmc/cavern" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/timmc/cavern"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/timmc/cavern'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/timmc/cavern" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/timmc/cavern"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/timmc/cavern'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fb6ebf68efb446fc986137c358b263ab7bef1572
[INFO] sha for GitHub repo timmc/cavern: fb6ebf68efb446fc986137c358b263ab7bef1572
[INFO] validating manifest of timmc/cavern on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:cargo-toml
[ERROR] caused by: missing Cargo.toml for timmc/cavern
[ERROR]