[INFO] updating cached repository https://github.com/rust-lang-nursery/chalk
[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/chalk
[INFO] [stderr]  + e2b7dcb77...b9a76d162 gh-pages   -> gh-pages  (forced update)
[INFO] [stderr]    27a985076..f5d1427fe  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f5d1427fefb6e81e486c1349565633762f88bae5
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.