[INFO] updating cached repository FaustXVI/rust_playground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/FaustXVI/rust_playground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/FaustXVI/rust_playground" "work/ex/beta-1.37-6/sources/1.36.0/gh/FaustXVI/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/FaustXVI/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/FaustXVI/rust_playground" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/FaustXVI/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/FaustXVI/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 301bb8a194313c3fa22ef498d3c7e474c2a78464
[INFO] sha for GitHub repo FaustXVI/rust_playground: 301bb8a194313c3fa22ef498d3c7e474c2a78464
[INFO] validating manifest of FaustXVI/rust_playground on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "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 FaustXVI/rust_playground's Cargo.toml
[ERROR] caused by: command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"` failed
[ERROR]