[INFO] cloning repository BurntSushi/rust-cmail
[INFO] running `"git" "clone" "--bare" "git://github.com/BurntSushi/rust-cmail.git" "work/cache/sources/gh/BurntSushi/rust-cmail"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/BurntSushi/rust-cmail'...
[INFO] running `"git" "clone" "work/cache/sources/gh/BurntSushi/rust-cmail" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/BurntSushi/rust-cmail"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/BurntSushi/rust-cmail'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/BurntSushi/rust-cmail" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/BurntSushi/rust-cmail"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/BurntSushi/rust-cmail'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ccb09ab81ffa801a2a293a73e0f99f320865debf
[INFO] sha for GitHub repo BurntSushi/rust-cmail: ccb09ab81ffa801a2a293a73e0f99f320865debf
[INFO] validating manifest of BurntSushi/rust-cmail 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 BurntSushi/rust-cmail 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 BurntSushi/rust-cmail
[INFO] finished frobbing BurntSushi/rust-cmail
[INFO] frobbed toml for BurntSushi/rust-cmail written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/BurntSushi/rust-cmail/Cargo.toml
[INFO] started frobbing BurntSushi/rust-cmail
[INFO] finished frobbing BurntSushi/rust-cmail
[INFO] frobbed toml for BurntSushi/rust-cmail written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/BurntSushi/rust-cmail/Cargo.toml
[INFO] crate BurntSushi/rust-cmail 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/BurntSushi/rust-cmail/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