[INFO] updating cached repository JMurph2015/rust-vebtrees
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/JMurph2015/rust-vebtrees
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/JMurph2015/rust-vebtrees" "work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/JMurph2015/rust-vebtrees"`
[INFO] [stderr] Cloning into 'work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/JMurph2015/rust-vebtrees'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JMurph2015/rust-vebtrees" "work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/JMurph2015/rust-vebtrees"`
[INFO] [stderr] Cloning into 'work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/JMurph2015/rust-vebtrees'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 93e05872bda527e30f763467e498e8b9e58cb11f
[INFO] sha for GitHub repo JMurph2015/rust-vebtrees: 93e05872bda527e30f763467e498e8b9e58cb11f
[INFO] validating manifest of JMurph2015/rust-vebtrees on toolchain master#d99a320cba42f661aebfa1293b7b2ec3603dda75
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of JMurph2015/rust-vebtrees on toolchain try#e70472fc501b855c9080f3772432c10fe20b8866
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing JMurph2015/rust-vebtrees
[INFO] finished frobbing JMurph2015/rust-vebtrees
[INFO] frobbed toml for JMurph2015/rust-vebtrees written to work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/JMurph2015/rust-vebtrees/Cargo.toml
[INFO] started frobbing JMurph2015/rust-vebtrees
[INFO] finished frobbing JMurph2015/rust-vebtrees
[INFO] frobbed toml for JMurph2015/rust-vebtrees written to work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/JMurph2015/rust-vebtrees/Cargo.toml
[INFO] crate JMurph2015/rust-vebtrees has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/JMurph2015/rust-vebtrees/Cargo.lock needs to be updated but --locked was passed to prevent this
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed