[INFO] updating cached repository https://github.com/getsentry/semaphore
[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/getsentry/semaphore
[INFO] [stderr]  - [deleted]         (none)     -> feat/outcome-remote-addr
[INFO] [stderr]  - [deleted]         (none)     -> feat/pytest-sentry-always-report
[INFO] [stderr]  * [new branch]      feat/add-metrics       -> feat/add-metrics
[INFO] [stderr]  * [new branch]      feature/envelopes      -> feature/envelopes
[INFO] [stderr]  * [new branch]      fix/py2-encoding       -> fix/py2-encoding
[INFO] [stderr]    17bbd0b..52d5949  master                 -> master
[INFO] [stderr]  * [new branch]      ref/stable-kafka-tests -> ref/stable-kafka-tests
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 52d5949d03eecd9de0830be7afa6e2b3960f497d
[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.