[INFO] cloning repository https://github.com/zeroeightysix/rustbar
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zeroeightysix/rustbar" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzeroeightysix%2Frustbar"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzeroeightysix%2Frustbar'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9b0d59104018bcf7f4d11b2b291b753278a9a340
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.