[INFO] cloning repository despawnerer/piston-tutorial
[INFO] running `"git" "clone" "--bare" "git://github.com/despawnerer/piston-tutorial.git" "work/cache/sources/gh/despawnerer/piston-tutorial"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/despawnerer/piston-tutorial'...
[INFO] running `"git" "clone" "work/cache/sources/gh/despawnerer/piston-tutorial" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/despawnerer/piston-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/despawnerer/piston-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/despawnerer/piston-tutorial" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/despawnerer/piston-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/despawnerer/piston-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c69755067502ce49455eae7683b051d3193d19f1
[INFO] sha for GitHub repo despawnerer/piston-tutorial: c69755067502ce49455eae7683b051d3193d19f1
[INFO] validating manifest of despawnerer/piston-tutorial on toolchain master#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of despawnerer/piston-tutorial on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing despawnerer/piston-tutorial
[INFO] finished frobbing despawnerer/piston-tutorial
[INFO] frobbed toml for despawnerer/piston-tutorial written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/despawnerer/piston-tutorial/Cargo.toml
[INFO] started frobbing despawnerer/piston-tutorial
[INFO] finished frobbing despawnerer/piston-tutorial
[INFO] frobbed toml for despawnerer/piston-tutorial written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/despawnerer/piston-tutorial/Cargo.toml
[INFO] crate despawnerer/piston-tutorial has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/despawnerer/piston-tutorial/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" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed