[INFO] cloning repository dbittman/ising-rust
[INFO] running `"git" "clone" "--bare" "git://github.com/dbittman/ising-rust.git" "work/cache/sources/gh/dbittman/ising-rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/dbittman/ising-rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/dbittman/ising-rust" "work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/dbittman/ising-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/dbittman/ising-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dbittman/ising-rust" "work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/dbittman/ising-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/dbittman/ising-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7d8daaff76966dd83d653ca49662e2565352313b
[INFO] sha for GitHub repo dbittman/ising-rust: 7d8daaff76966dd83d653ca49662e2565352313b
[INFO] validating manifest of dbittman/ising-rust 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 dbittman/ising-rust 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 dbittman/ising-rust
[INFO] finished frobbing dbittman/ising-rust
[INFO] frobbed toml for dbittman/ising-rust written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/gh/dbittman/ising-rust/Cargo.toml
[INFO] started frobbing dbittman/ising-rust
[INFO] finished frobbing dbittman/ising-rust
[INFO] frobbed toml for dbittman/ising-rust written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/gh/dbittman/ising-rust/Cargo.toml
[INFO] crate dbittman/ising-rust 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 git repository `https://github.com/pistondevelopers/event`
[INFO] [stderr] error: failed to load source for a dependency on `pistoncore-event`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/pistondevelopers/event#4166dc0c
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to fetch into /mnt/big/crater/work/local/cargo-home/git/db/event-dedf5ad125ed649a
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to authenticate when downloading repository
[INFO] [stderr] attempted to find username/password via git's `credential.helper` support, but failed
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to acquire username/password from local configuration
[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