[INFO] updating cached repository Vlad-Shcherbina/unlambda
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Vlad-Shcherbina/unlambda
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Vlad-Shcherbina/unlambda" "work/ex/beta-1.38-1/sources/1.37.0/gh/Vlad-Shcherbina/unlambda"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Vlad-Shcherbina/unlambda'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Vlad-Shcherbina/unlambda" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vlad-Shcherbina/unlambda"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vlad-Shcherbina/unlambda'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 52631e1dc562794e9301d20707797ad8351ea4c5
[INFO] sha for GitHub repo Vlad-Shcherbina/unlambda: 52631e1dc562794e9301d20707797ad8351ea4c5
[INFO] validating manifest of Vlad-Shcherbina/unlambda 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 Vlad-Shcherbina/unlambda 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 Vlad-Shcherbina/unlambda
[INFO] removed workspace from Vlad-Shcherbina/unlambda
[INFO] removed path dependency rc_stack from Vlad-Shcherbina/unlambda
[INFO] finished frobbing Vlad-Shcherbina/unlambda
[INFO] frobbed toml for Vlad-Shcherbina/unlambda written to work/ex/beta-1.38-1/sources/1.37.0/gh/Vlad-Shcherbina/unlambda/Cargo.toml
[INFO] started frobbing Vlad-Shcherbina/unlambda
[INFO] removed workspace from Vlad-Shcherbina/unlambda
[INFO] removed path dependency rc_stack from Vlad-Shcherbina/unlambda
[INFO] finished frobbing Vlad-Shcherbina/unlambda
[INFO] frobbed toml for Vlad-Shcherbina/unlambda written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Vlad-Shcherbina/unlambda/Cargo.toml
[INFO] crate Vlad-Shcherbina/unlambda 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 `rc_stack` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `unlambda v0.1.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Vlad-Shcherbina/unlambda)`
[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