[INFO] updating cached repository https://github.com/rust-lang-nursery/chalk
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] [stderr] From https://github.com/rust-lang-nursery/chalk
[INFO] [stderr]    5f4d08c5d..6a46a7c41  auto       -> auto
[INFO] [stderr]  + 284854d1a...4efce343c gh-pages   -> gh-pages  (forced update)
[INFO] [stderr]    248b46412..6a46a7c41  master     -> master
[INFO] [stderr]  * [new tag]             v0.20.0    -> v0.20.0
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6a46a7c41a797c788affb775d428fd6581ad93f0
[ERROR] this task or one of its parent failed!
[ERROR] command `Command { std: "/workspace/cargo-home/bin/cargo" "+22dd2dd1dc07f63ae9394352d412f020d2985684" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.