[INFO] updating cached repository mjkillough/cnx
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mjkillough/cnx
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mjkillough/cnx" "work/ex/beta-1.38-1/sources/1.37.0/gh/mjkillough/cnx"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mjkillough/cnx'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mjkillough/cnx" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mjkillough/cnx"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mjkillough/cnx'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 617dcf6c110e595aefd532af3de9398c4790154b
[INFO] sha for GitHub repo mjkillough/cnx: 617dcf6c110e595aefd532af3de9398c4790154b
[INFO] validating manifest of mjkillough/cnx 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 mjkillough/cnx 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 mjkillough/cnx
[INFO] finished frobbing mjkillough/cnx
[INFO] frobbed toml for mjkillough/cnx written to work/ex/beta-1.38-1/sources/1.37.0/gh/mjkillough/cnx/Cargo.toml
[INFO] started frobbing mjkillough/cnx
[INFO] finished frobbing mjkillough/cnx
[INFO] frobbed toml for mjkillough/cnx written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mjkillough/cnx/Cargo.toml
[INFO] crate mjkillough/cnx 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: checksum for `xcb-util v0.2.0` changed between lock files
[INFO] [stderr] 
[INFO] [stderr] this could be indicative of a few possible errors:
[INFO] [stderr] 
[INFO] [stderr]     * the lock file is corrupt
[INFO] [stderr]     * a replacement source in use (e.g., a mirror) returned a different checksum
[INFO] [stderr]     * the source itself may be corrupt in one way or another
[INFO] [stderr] 
[INFO] [stderr] unable to verify that `xcb-util v0.2.0` is the same as when the lockfile was generated
[INFO] [stderr] 
[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