[INFO] crate futures-shuttle 0.2.1 is already in cache
[INFO] extracting crate futures-shuttle 0.2.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/futures-shuttle/0.2.1
[INFO] extracting crate futures-shuttle 0.2.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-shuttle/0.2.1
[INFO] validating manifest of futures-shuttle-0.2.1 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of futures-shuttle-0.2.1 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing futures-shuttle-0.2.1
[INFO] finished frobbing futures-shuttle-0.2.1
[INFO] frobbed toml for futures-shuttle-0.2.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/futures-shuttle/0.2.1/Cargo.toml
[INFO] started frobbing futures-shuttle-0.2.1
[INFO] finished frobbing futures-shuttle-0.2.1
[INFO] frobbed toml for futures-shuttle-0.2.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-shuttle/0.2.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `futures = "^0.2.0"`
[INFO] [stderr]   candidate versions found which didn't match: 0.1.28, 0.1.27, 0.1.26, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `futures-shuttle v0.2.1 (/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-shuttle/0.2.1)`
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:yanked
[ERROR] caused by: crate futures-shuttle-0.2.1 depends on yanked crates
[ERROR]