[INFO] cloning repository https://github.com/tcr/rust-acorn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tcr/rust-acorn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcr%2Frust-acorn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcr%2Frust-acorn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 18da0981a78f94da2c35afbede7f199e26327d18
[INFO] checking tcr/rust-acorn against master#092a284ba0421695f2032c947765429fd7095796 for pr-139763
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftcr%2Frust-acorn" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] error: unable to write file test/compare/traceur.js
[INFO] [stderr] error: unable to write file test/driver.js
[INFO] [stderr] error: unable to write file test/index.html
[INFO] [stderr] error: unable to write file test/jquery-string.js
[INFO] [stderr] error: unable to write file test/run.js
[INFO] [stderr] error: unable to write file test/simple.js
[INFO] [stderr] error: unable to write file test/tests-harmony.js
[INFO] [stderr] error: unable to write file test/tests.js
[INFO] [stderr] fatal: unable to checkout working tree
[INFO] [stderr] warning: Clone succeeded, but checkout failed.
[INFO] [stderr] You can inspect what was checked out with 'git status'
[INFO] [stderr] and retry with 'git restore --source=HEAD :/'
[INFO] [stderr] 


failed to checkout https://github.com/tcr/rust-acorn

Caused by:
    command failed: exit status: 128