[INFO] cloning repository rust-lang-nursery/polonius
[INFO] running `"git" "clone" "--bare" "git://github.com/rust-lang-nursery/polonius.git" "work/cache/sources/gh/rust-lang-nursery/polonius"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/rust-lang-nursery/polonius'...
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-lang-nursery/polonius" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/rust-lang-nursery/polonius"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/rust-lang-nursery/polonius'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rust-lang-nursery/polonius" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/rust-lang-nursery/polonius"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/rust-lang-nursery/polonius'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ecafafba28e4903b9fe7a7df19b87d97541c3c62
[INFO] sha for GitHub repo rust-lang-nursery/polonius: ecafafba28e4903b9fe7a7df19b87d97541c3c62
[INFO] validating manifest of rust-lang-nursery/polonius 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 rust-lang-nursery/polonius 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 rust-lang-nursery/polonius
[INFO] removed workspace from rust-lang-nursery/polonius
[INFO] removed path dependency polonius-engine from rust-lang-nursery/polonius
[INFO] removed path dependency polonius-parser from rust-lang-nursery/polonius
[INFO] finished frobbing rust-lang-nursery/polonius
[INFO] frobbed toml for rust-lang-nursery/polonius written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/rust-lang-nursery/polonius/Cargo.toml
[INFO] started frobbing rust-lang-nursery/polonius
[INFO] removed workspace from rust-lang-nursery/polonius
[INFO] removed path dependency polonius-engine from rust-lang-nursery/polonius
[INFO] removed path dependency polonius-parser from rust-lang-nursery/polonius
[INFO] finished frobbing rust-lang-nursery/polonius
[INFO] frobbed toml for rust-lang-nursery/polonius written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/rust-lang-nursery/polonius/Cargo.toml
[INFO] crate rust-lang-nursery/polonius 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]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/rust-lang-nursery/polonius/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