[INFO] updating cached repository https://github.com/rust-lang-nursery/polonius
[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/polonius
[INFO] [stderr]  + a012f47d3e...ffed1d09bb gh-pages   -> gh-pages  (forced update)
[INFO] [stderr]    235745d838..96e4755995  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 96e47559955457bf866f76c4b2f3337d2b2782b4
[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