[INFO] cloning repository https://github.com/Machtan/playground-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Machtan/playground-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMachtan%2Fplayground-rust"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMachtan%2Fplayground-rust'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e3dad6cc8ca52eb6149876fe999aa981468d40e
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.