[INFO] crate volatile_cell 1.0.0 is already in cache
[INFO] extracting crate volatile_cell 1.0.0 into work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/reg/volatile_cell/1.0.0
[INFO] extracting crate volatile_cell 1.0.0 into work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/reg/volatile_cell/1.0.0
[INFO] validating manifest of volatile_cell-1.0.0 on toolchain master#589beb979c0f1a9736e02e578913db88398c3ba5
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of volatile_cell-1.0.0 on toolchain try#42445ded8fd34235a676755cb5d079658ed51f6a
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+42445ded8fd34235a676755cb5d079658ed51f6a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing volatile_cell-1.0.0
[INFO] finished frobbing volatile_cell-1.0.0
[INFO] frobbed toml for volatile_cell-1.0.0 written to work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/reg/volatile_cell/1.0.0/Cargo.toml
[INFO] started frobbing volatile_cell-1.0.0
[INFO] finished frobbing volatile_cell-1.0.0
[INFO] frobbed toml for volatile_cell-1.0.0 written to work/ex/pr-60944/sources/try#42445ded8fd34235a676755cb5d079658ed51f6a/reg/volatile_cell/1.0.0/Cargo.toml
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Updating git repository `https://github.com/hackndev/rust-libcore`
[INFO] [stderr] error: no matching package named `core` found
[INFO] [stderr] location searched: https://github.com/hackndev/rust-libcore
[INFO] [stderr] required by package `volatile_cell v1.0.0 (/mnt/crater-raid/crater/work/ex/pr-60944/sources/master#589beb979c0f1a9736e02e578913db88398c3ba5/reg/volatile_cell/1.0.0)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+589beb979c0f1a9736e02e578913db88398c3ba5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed