[INFO] fetching crate sentinel 0.1.2...
[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.