[INFO] updating cached repository https://github.com/mimblewimble/grin-wallet
[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/mimblewimble/grin-wallet
[INFO] [stderr]    54af157..1dfa6e2  current/3.1.x -> current/3.1.x
[INFO] [stderr]    db12712..2a2367f  master        -> master
[INFO] [stderr]  * [new tag]         v3.1.2        -> v3.1.2
[INFO] [stderr]  * [new tag]         v4.0.0-beta.1 -> v4.0.0-beta.1
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2a2367ff040d6e9ad9cb0558cc5d7fde79635668
[ERROR] this task or one of its parent failed!
[ERROR] command `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.