[INFO] updating cached repository samsieber/rubber-duck
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/samsieber/rubber-duck
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/samsieber/rubber-duck" "work/ex/beta-1.38-1/sources/1.37.0/gh/samsieber/rubber-duck"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/samsieber/rubber-duck'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/samsieber/rubber-duck" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/samsieber/rubber-duck"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/samsieber/rubber-duck'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7286a3f8dbe7783cd77fe53fbc7166fa522c94f8
[INFO] sha for GitHub repo samsieber/rubber-duck: 7286a3f8dbe7783cd77fe53fbc7166fa522c94f8
[INFO] validating manifest of samsieber/rubber-duck on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:cargo-toml
[ERROR] caused by: invalid syntax in samsieber/rubber-duck's Cargo.toml
[ERROR] caused by: command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"` failed
[ERROR]