[INFO] updating cached repository https://github.com/arapat/rust-boost
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/arapat/rust-boost
[INFO] [stderr]  - [deleted]         (none)     -> tmsn
[INFO] [stderr]    2c149a4..086388e  master      -> master
[INFO] [stderr]  * [new branch]      neurips     -> neurips
[INFO] [stderr]  * [new branch]      sid         -> sid
[INFO] [stderr]    500660d..8c5d02a  tmsn-stable -> tmsn-stable
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 086388e7c737d669659730bc9b28ee967aeb9931
[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.