[INFO] updating cached repository charignon/optirust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/charignon/optirust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/charignon/optirust" "work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/gh/charignon/optirust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/gh/charignon/optirust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/charignon/optirust" "work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/gh/charignon/optirust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/gh/charignon/optirust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4d45750c8d4b72dfd88f543c9251a36de7de9433
[INFO] sha for GitHub repo charignon/optirust: 4d45750c8d4b72dfd88f543c9251a36de7de9433
[INFO] validating manifest of charignon/optirust on toolchain master#ef01f29964df207f181bd5bcf236e41372a17273
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of charignon/optirust on toolchain try#a7cff45e655f886da150e206c7acbe984df4ab71
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a7cff45e655f886da150e206c7acbe984df4ab71-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing charignon/optirust
[INFO] finished frobbing charignon/optirust
[INFO] frobbed toml for charignon/optirust written to work/ex/pr-60620-1/sources/master#ef01f29964df207f181bd5bcf236e41372a17273/gh/charignon/optirust/Cargo.toml
[INFO] started frobbing charignon/optirust
[INFO] finished frobbing charignon/optirust
[INFO] frobbed toml for charignon/optirust written to work/ex/pr-60620-1/sources/try#a7cff45e655f886da150e206c7acbe984df4ab71/gh/charignon/optirust/Cargo.toml
[INFO] crate charignon/optirust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr] error: checksum for `google-calendar3 v1.0.7+20171205` 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 `google-calendar3 v1.0.7+20171205` 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" "+ef01f29964df207f181bd5bcf236e41372a17273-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed