[INFO] updating cached repository zcash/mpc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/zcash/mpc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/zcash/mpc" "work/ex/beta-1.38-1/sources/1.37.0/gh/zcash/mpc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/zcash/mpc'...
[INFO] [stderr] done.
[INFO] [stderr] Checking out files:  31% (57/182)   
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Checking out files: 100% (182/182), done.
[INFO] running `"git" "clone" "work/cache/sources/gh/zcash/mpc" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zcash/mpc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zcash/mpc'...
[INFO] [stderr] done.
[INFO] [stderr] Checking out files:  49% (90/182)   
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Checking out files: 100% (182/182)   
Checking out files: 100% (182/182), done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 305268e2378c4544d02b0caf74d5170941fe6312
[INFO] sha for GitHub repo zcash/mpc: 305268e2378c4544d02b0caf74d5170941fe6312
[INFO] validating manifest of zcash/mpc on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of zcash/mpc on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing zcash/mpc
[INFO] removed path dependency snark from zcash/mpc
[INFO] finished frobbing zcash/mpc
[INFO] frobbed toml for zcash/mpc written to work/ex/beta-1.38-1/sources/1.37.0/gh/zcash/mpc/Cargo.toml
[INFO] started frobbing zcash/mpc
[INFO] removed path dependency snark from zcash/mpc
[INFO] finished frobbing zcash/mpc
[INFO] frobbed toml for zcash/mpc written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zcash/mpc/Cargo.toml
[INFO] crate zcash/mpc already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: no matching package named `snark` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `mpc v0.0.1 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/zcash/mpc)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed