[INFO] fetching crate kcore 0.0.1...
[INFO] extracting crate kcore 0.0.1 into work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/kcore/0.0.1
[INFO] extracting crate kcore 0.0.1 into work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/kcore/0.0.1
[INFO] validating manifest of kcore-0.0.1 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kcore-0.0.1 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kcore-0.0.1
[INFO] finished frobbing kcore-0.0.1
[INFO] frobbed toml for kcore-0.0.1 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/kcore/0.0.1/Cargo.toml
[INFO] started frobbing kcore-0.0.1
[INFO] finished frobbing kcore-0.0.1
[INFO] frobbed toml for kcore-0.0.1 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/kcore/0.0.1/Cargo.toml
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.11.0"`
[INFO] [stderr]   candidate versions found which didn't match: 0.15.0, 0.14.6, 0.14.5, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `cookie v0.9.1`
[INFO] [stderr]     ... which is depended on by `rocket v0.3.3`
[INFO] [stderr]     ... which is depended on by `kcore v0.0.1 (/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/kcore/0.0.1)`
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:yanked
[ERROR] caused by: crate kcore-0.0.1 depends on yanked crates
[ERROR]