[INFO] updating cached repository https://github.com/rust-lang-nursery/rustfmt
[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/rust-lang-nursery/rustfmt
[INFO] [stderr]    1e9af9fa..9ace1de9  master         -> master
[INFO] [stderr]  * [new branch]        rustfmt-1.4.14 -> rustfmt-1.4.14
[INFO] [stderr]  * [new tag]           v1.4.14        -> v1.4.14
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9ace1de9c38eb826412cca14fcf48a5de4fc0a58
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+8a5e87609850cdd8679aada01eb0f3062f254ca8" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.