[INFO] cloning repository https://github.com/takagisou/a_half_hour_to_learn_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/takagisou/a_half_hour_to_learn_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakagisou%2Fa_half_hour_to_learn_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakagisou%2Fa_half_hour_to_learn_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab1c55da334154869e4e552c04f3f9e4e82a2135
[INFO] checking takagisou/a_half_hour_to_learn_rust against master#5337252b9952fdd9482ed6a4add17254e5bd2c40 for pr-138785
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftakagisou%2Fa_half_hour_to_learn_rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] error: Unable to create '/workspace/builds/worker-4-tc1/source/.git/refs/remotes/origin/HEAD.lock': No such file or directory
[INFO] [stderr] fatal: unable to update refs/remotes/origin/HEAD


failed to checkout https://github.com/takagisou/a_half_hour_to_learn_rust

Caused by:
    command failed: exit status: 128