[INFO] updating cached repository scholtzan/xiff
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/scholtzan/xiff
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/scholtzan/xiff" "work/ex/beta-1.38-1/sources/1.37.0/gh/scholtzan/xiff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/scholtzan/xiff'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/scholtzan/xiff" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scholtzan/xiff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scholtzan/xiff'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9159fd24f71038d724ede01db4a6dec370b5b2a9
[INFO] sha for GitHub repo scholtzan/xiff: 9159fd24f71038d724ede01db4a6dec370b5b2a9
[INFO] validating manifest of scholtzan/xiff 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 scholtzan/xiff 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 scholtzan/xiff
[INFO] removed path dependency xi-core-lib from scholtzan/xiff
[INFO] removed path dependency xi-plugin-lib from scholtzan/xiff
[INFO] removed path dependency xi-rope from scholtzan/xiff
[INFO] removed path dependency xi-trace from scholtzan/xiff
[INFO] finished frobbing scholtzan/xiff
[INFO] frobbed toml for scholtzan/xiff written to work/ex/beta-1.38-1/sources/1.37.0/gh/scholtzan/xiff/Cargo.toml
[INFO] started frobbing scholtzan/xiff
[INFO] removed path dependency xi-core-lib from scholtzan/xiff
[INFO] removed path dependency xi-plugin-lib from scholtzan/xiff
[INFO] removed path dependency xi-rope from scholtzan/xiff
[INFO] removed path dependency xi-trace from scholtzan/xiff
[INFO] finished frobbing scholtzan/xiff
[INFO] frobbed toml for scholtzan/xiff written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/scholtzan/xiff/Cargo.toml
[INFO] crate scholtzan/xiff 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 crates.io index
[INFO] [stderr] error: no matching package named `xi-plugin-lib` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `xiff v0.0.1 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/scholtzan/xiff)`
[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