[INFO] updating cached repository ChunMinChang/rust-coreaudio-draft
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ChunMinChang/rust-coreaudio-draft
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ChunMinChang/rust-coreaudio-draft" "work/ex/beta-1.38-1/sources/1.37.0/gh/ChunMinChang/rust-coreaudio-draft"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ChunMinChang/rust-coreaudio-draft'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ChunMinChang/rust-coreaudio-draft" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ChunMinChang/rust-coreaudio-draft"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ChunMinChang/rust-coreaudio-draft'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f6aef04a5e925be47355aa7605653a655ebb003e
[INFO] sha for GitHub repo ChunMinChang/rust-coreaudio-draft: f6aef04a5e925be47355aa7605653a655ebb003e
[INFO] validating manifest of ChunMinChang/rust-coreaudio-draft on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ChunMinChang/rust-coreaudio-draft on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ChunMinChang/rust-coreaudio-draft
[INFO] finished frobbing ChunMinChang/rust-coreaudio-draft
[INFO] frobbed toml for ChunMinChang/rust-coreaudio-draft written to work/ex/beta-1.38-1/sources/1.37.0/gh/ChunMinChang/rust-coreaudio-draft/Cargo.toml
[INFO] started frobbing ChunMinChang/rust-coreaudio-draft
[INFO] finished frobbing ChunMinChang/rust-coreaudio-draft
[INFO] frobbed toml for ChunMinChang/rust-coreaudio-draft written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ChunMinChang/rust-coreaudio-draft/Cargo.toml
[INFO] crate ChunMinChang/rust-coreaudio-draft already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/ChunMinChang/coreaudio-sys/`
[INFO] [stderr] error: failed to load source for a dependency on `coreaudio-sys`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/ChunMinChang/coreaudio-sys/?branch=gecko-build#e505caeb
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec 'e505caeb97459e210455cb09b7a670368fe638c8' not found; class=Reference (4); code=NotFound (-3)
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed