[INFO] updating cached repository https://github.com/rust-lang-nursery/chalk
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/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]  + 9561a12b...7c5b99a6 gh-pages   -> gh-pages  (forced update)
[INFO] [stderr]    5c6cea8b..b4a6b655  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b4a6b655578ee35b1b3f6b8579636269cf3b0b1a
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed