[INFO] updating cached repository https://github.com/rust-lang-nursery/polonius
[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/polonius
[INFO] [stderr]  + 472d7f0636...823ef0f03b gh-pages   -> gh-pages  (forced update)
[INFO] [stderr]    0a65edeb30..46b7c63dd1  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 46b7c63dd1322dfd6f9b2c4817f5a943cc9c569f
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+8810c24b0958114d8dbb32d878444e8956fce80f" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.