[INFO] updating cached repository archer884/watcher
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/archer884/watcher
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/watcher" "work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/watcher"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/watcher'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/archer884/watcher" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/watcher"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/watcher'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 668f0d989f5fb9af5c1960b67f0ca68d2bb94f07
[INFO] sha for GitHub repo archer884/watcher: 668f0d989f5fb9af5c1960b67f0ca68d2bb94f07
[INFO] validating manifest of archer884/watcher 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 archer884/watcher 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 archer884/watcher
[INFO] finished frobbing archer884/watcher
[INFO] frobbed toml for archer884/watcher written to work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/watcher/Cargo.toml
[INFO] started frobbing archer884/watcher
[INFO] finished frobbing archer884/watcher
[INFO] frobbed toml for archer884/watcher written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/archer884/watcher/Cargo.toml
[INFO] crate archer884/watcher 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] error: failed to select a version for `toml`.
[INFO] [stderr]     ... required by package `watcher v0.1.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/archer884/watcher)`
[INFO] [stderr] versions that meet the requirements `= 0.4.1` are: 0.4.1
[INFO] [stderr] 
[INFO] [stderr] the package `watcher` depends on `toml`, with features: `serde` but `toml` does not have these features.
[INFO] [stderr]  It has a required dependency with that name, but only optional dependencies can be used as features.
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr] failed to select a version for `toml` 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