[INFO] updating cached repository faern/forkjoin-benchmarking
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/faern/forkjoin-benchmarking
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/faern/forkjoin-benchmarking" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/faern/forkjoin-benchmarking"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/faern/forkjoin-benchmarking'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/faern/forkjoin-benchmarking" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/faern/forkjoin-benchmarking"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/faern/forkjoin-benchmarking'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2871e809b286229b2df81d61813a4c523c726952
[INFO] sha for GitHub repo faern/forkjoin-benchmarking: 2871e809b286229b2df81d61813a4c523c726952
[INFO] validating manifest of faern/forkjoin-benchmarking on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of faern/forkjoin-benchmarking on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing faern/forkjoin-benchmarking
[INFO] finished frobbing faern/forkjoin-benchmarking
[INFO] frobbed toml for faern/forkjoin-benchmarking written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/faern/forkjoin-benchmarking/Cargo.toml
[INFO] started frobbing faern/forkjoin-benchmarking
[INFO] finished frobbing faern/forkjoin-benchmarking
[INFO] frobbed toml for faern/forkjoin-benchmarking written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/faern/forkjoin-benchmarking/Cargo.toml
[INFO] crate faern/forkjoin-benchmarking already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/faern/forkjoin-benchmarking/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/faern/criterion.rs`
[INFO] [stderr]     Updating git repository `https://github.com/faern/forkjoin`
[INFO] [stderr]     Updating git repository `https://github.com/rust-lang/log`
[INFO] [stderr]     Updating git repository `https://github.com/rust-lang/rustc-serialize`
[INFO] [stderr]     Updating git repository `https://github.com/japaric/simplot.rs`
[INFO] [stderr] error: failed to load source for a dependency on `simplot`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/japaric/simplot.rs
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Could not find Cargo.toml in `/mnt/big/crater/work/local/cargo-home/git/checkouts/simplot.rs-a87b4b0a061b4207/e45eb1d`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed