[INFO] updating cached repository snbn/mrbind
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/snbn/mrbind
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/snbn/mrbind" "work/ex/beta-1.38-1/sources/1.37.0/gh/snbn/mrbind"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/snbn/mrbind'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/snbn/mrbind" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/snbn/mrbind"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/snbn/mrbind'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 574bd548ddb26fb4855e2bb7ccfc3a2f11a56297
[INFO] sha for GitHub repo snbn/mrbind: 574bd548ddb26fb4855e2bb7ccfc3a2f11a56297
[INFO] validating manifest of snbn/mrbind 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 snbn/mrbind 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 snbn/mrbind
[INFO] removed path dependency mruby-sys from snbn/mrbind
[INFO] finished frobbing snbn/mrbind
[INFO] frobbed toml for snbn/mrbind written to work/ex/beta-1.38-1/sources/1.37.0/gh/snbn/mrbind/Cargo.toml
[INFO] started frobbing snbn/mrbind
[INFO] removed path dependency mruby-sys from snbn/mrbind
[INFO] finished frobbing snbn/mrbind
[INFO] frobbed toml for snbn/mrbind written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/snbn/mrbind/Cargo.toml
[INFO] crate snbn/mrbind 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: failed to select a version for `mruby-sys`.
[INFO] [stderr]     ... required by package `mrbind v0.1.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/snbn/mrbind)`
[INFO] [stderr] versions that meet the requirements `*` are: 0.2.0, 0.1.1, 0.1.0
[INFO] [stderr] 
[INFO] [stderr] the package `mrbind` depends on `mruby-sys`, with features: `compiler, error` but `mruby-sys` does not have these features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `mruby-sys` which could resolve this conflict
[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