[INFO] updating cached repository mgsloan/ainav
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mgsloan/ainav
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mgsloan/ainav" "work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/ainav"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/ainav'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mgsloan/ainav" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/ainav"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/ainav'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5259362d0377d2c29274a662e9307df3bd85c4d0
[INFO] sha for GitHub repo mgsloan/ainav: 5259362d0377d2c29274a662e9307df3bd85c4d0
[INFO] validating manifest of mgsloan/ainav 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 mgsloan/ainav 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 mgsloan/ainav
[INFO] finished frobbing mgsloan/ainav
[INFO] frobbed toml for mgsloan/ainav written to work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/ainav/Cargo.toml
[INFO] started frobbing mgsloan/ainav
[INFO] finished frobbing mgsloan/ainav
[INFO] frobbed toml for mgsloan/ainav written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/ainav/Cargo.toml
[INFO] crate mgsloan/ainav 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] error: failed to resolve patches for `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to load source for a dependency on `xcb`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/ainav/rust-xcb
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to read `/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/ainav/rust-xcb/Cargo.toml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No such file or directory (os error 2)
[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