[INFO] crate futures-shuttle 0.2.1 is already in cache
[INFO] extracting crate futures-shuttle 0.2.1 into work/ex/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/reg/futures-shuttle/0.2.1
[INFO] extracting crate futures-shuttle 0.2.1 into work/ex/pr-57609/sources/try#26f8d250bb3c8a85e812cf663c730ef9e0df9315/reg/futures-shuttle/0.2.1
[INFO] validating manifest of futures-shuttle-0.2.1 on toolchain master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+03acbd71c977cd63ce5f39ba9b6fe9ffd578785a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of futures-shuttle-0.2.1 on toolchain try#26f8d250bb3c8a85e812cf663c730ef9e0df9315
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+26f8d250bb3c8a85e812cf663c730ef9e0df9315-alt" "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/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/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/pr-57609/sources/try#26f8d250bb3c8a85e812cf663c730ef9e0df9315/reg/futures-shuttle/0.2.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+03acbd71c977cd63ce5f39ba9b6fe9ffd578785a-alt" "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: 0.1.25, 0.1.24, 0.1.23, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `futures-shuttle v0.2.1 (/mnt/big/crater/work/ex/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/reg/futures-shuttle/0.2.1)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+03acbd71c977cd63ce5f39ba9b6fe9ffd578785a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed