[INFO] updating cached repository matt2xu/rustfest2016
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/matt2xu/rustfest2016
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/matt2xu/rustfest2016" "work/ex/clippy-test-run/sources/stable/gh/matt2xu/rustfest2016"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/matt2xu/rustfest2016'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/matt2xu/rustfest2016" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/matt2xu/rustfest2016"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/matt2xu/rustfest2016'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8ec43273c9f805a59aa6e2cbb2ad4564b9b4cb94
[INFO] sha for GitHub repo matt2xu/rustfest2016: 8ec43273c9f805a59aa6e2cbb2ad4564b9b4cb94
[INFO] validating manifest of matt2xu/rustfest2016 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of matt2xu/rustfest2016 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing matt2xu/rustfest2016
[INFO] finished frobbing matt2xu/rustfest2016
[INFO] frobbed toml for matt2xu/rustfest2016 written to work/ex/clippy-test-run/sources/stable/gh/matt2xu/rustfest2016/Cargo.toml
[INFO] started frobbing matt2xu/rustfest2016
[INFO] finished frobbing matt2xu/rustfest2016
[INFO] frobbed toml for matt2xu/rustfest2016 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/matt2xu/rustfest2016/Cargo.toml
[INFO] crate matt2xu/rustfest2016 has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on the registry index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/matt2xu/rustfest2016/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" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed