[INFO] updating cached repository birktj/image-streaming-iterator-bench
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/birktj/image-streaming-iterator-bench
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/birktj/image-streaming-iterator-bench" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/birktj/image-streaming-iterator-bench"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/birktj/image-streaming-iterator-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/birktj/image-streaming-iterator-bench" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/birktj/image-streaming-iterator-bench"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/birktj/image-streaming-iterator-bench'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b93ae97043a320257692ccb3e1450196a0f518b1
[INFO] sha for GitHub repo birktj/image-streaming-iterator-bench: b93ae97043a320257692ccb3e1450196a0f518b1
[INFO] validating manifest of birktj/image-streaming-iterator-bench on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of birktj/image-streaming-iterator-bench on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing birktj/image-streaming-iterator-bench
[INFO] finished frobbing birktj/image-streaming-iterator-bench
[INFO] frobbed toml for birktj/image-streaming-iterator-bench written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/birktj/image-streaming-iterator-bench/Cargo.toml
[INFO] started frobbing birktj/image-streaming-iterator-bench
[INFO] finished frobbing birktj/image-streaming-iterator-bench
[INFO] frobbed toml for birktj/image-streaming-iterator-bench written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/birktj/image-streaming-iterator-bench/Cargo.toml
[INFO] crate birktj/image-streaming-iterator-bench already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/birktj/image`
[INFO] [stderr] error: failed to load source for a dependency on `image`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/birktj/image?branch=incremental_png_loading#2d2838d7
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec '2d2838d7f15aa8347757be4aaa3bb4624fcea264' 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" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed