[INFO] updating cached repository https://github.com/mimblewimble/grin
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/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/mimblewimble/grin
[INFO] [stderr]  * [new branch]        current/2.1.x -> current/2.1.x
[INFO] [stderr]    ae556a8a..eefd87aa  master        -> master
[INFO] [stderr]  * [new tag]           v2.1.0-beta.2 -> v2.1.0-beta.2
[INFO] [stderr]  * [new tag]           v2.1.0-beta.3 -> v2.1.0-beta.3
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] eefd87aa2e4da899683204955e789fe61e70da24
[ERROR] this task or one of its parent failed!
[ERROR] command `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.