[INFO] updating cached repository https://github.com/RustPython/RustPython
[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/RustPython/RustPython
[INFO] [stderr]  - [deleted]           (none)     -> coolreader18/_thread-_local
[INFO] [stderr]  - [deleted]           (none)     -> coolreader18/fix-codecov
[INFO] [stderr]  - [deleted]           (none)     -> coolreader18/fix-redox
[INFO] [stderr]    1e3406e7..7bf19df7  coolreader18/32bit-support -> coolreader18/32bit-support
[INFO] [stderr]  * [new branch]        coolreader18/json-encode_basestring -> coolreader18/json-encode_basestring
[INFO] [stderr]    595f68bd..569031d4  master                     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 569031d4042ddf6a2ba5c83d1d4d14b3544517b7
[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.