[INFO] updating cached repository mystal/zombie-bird-midgar
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mystal/zombie-bird-midgar
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mystal/zombie-bird-midgar" "work/ex/beta-1.38-1/sources/1.37.0/gh/mystal/zombie-bird-midgar"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mystal/zombie-bird-midgar'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mystal/zombie-bird-midgar" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mystal/zombie-bird-midgar"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mystal/zombie-bird-midgar'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 76814edd7b8a214e0ffbb6eeda7802c66d18c51e
[INFO] sha for GitHub repo mystal/zombie-bird-midgar: 76814edd7b8a214e0ffbb6eeda7802c66d18c51e
[INFO] validating manifest of mystal/zombie-bird-midgar 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 mystal/zombie-bird-midgar 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 mystal/zombie-bird-midgar
[INFO] finished frobbing mystal/zombie-bird-midgar
[INFO] frobbed toml for mystal/zombie-bird-midgar written to work/ex/beta-1.38-1/sources/1.37.0/gh/mystal/zombie-bird-midgar/Cargo.toml
[INFO] started frobbing mystal/zombie-bird-midgar
[INFO] finished frobbing mystal/zombie-bird-midgar
[INFO] frobbed toml for mystal/zombie-bird-midgar written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mystal/zombie-bird-midgar/Cargo.toml
[INFO] crate mystal/zombie-bird-midgar 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/mystal/glium-sdl2`
[INFO] [stderr] error: failed to load source for a dependency on `glium_sdl2`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/mystal/glium-sdl2?branch=dev#125ff336
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '125ff33672c4302ca92cef9e7a00c7771976d0bf' 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