[INFO] updating cached repository wbjohnston/sgbe
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wbjohnston/sgbe
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wbjohnston/sgbe" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/wbjohnston/sgbe"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/wbjohnston/sgbe'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wbjohnston/sgbe" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/wbjohnston/sgbe"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/wbjohnston/sgbe'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d4be50267e7e0df3304ed348bf2064a64b7b9f93
[INFO] sha for GitHub repo wbjohnston/sgbe: d4be50267e7e0df3304ed348bf2064a64b7b9f93
[INFO] validating manifest of wbjohnston/sgbe on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of wbjohnston/sgbe on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing wbjohnston/sgbe
[INFO] removed workspace from wbjohnston/sgbe
[INFO] removed path dependency core from wbjohnston/sgbe
[INFO] finished frobbing wbjohnston/sgbe
[INFO] frobbed toml for wbjohnston/sgbe written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/wbjohnston/sgbe/Cargo.toml
[INFO] started frobbing wbjohnston/sgbe
[INFO] removed workspace from wbjohnston/sgbe
[INFO] removed path dependency core from wbjohnston/sgbe
[INFO] finished frobbing wbjohnston/sgbe
[INFO] frobbed toml for wbjohnston/sgbe written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/wbjohnston/sgbe/Cargo.toml
[INFO] crate wbjohnston/sgbe already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: no matching package named `core` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `sgbe v0.1.0 (/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/wbjohnston/sgbe)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed