[INFO] crate merkle-generator 0.2.0 is already in cache
[INFO] extracting crate merkle-generator 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/merkle-generator/0.2.0
[INFO] extracting crate merkle-generator 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/merkle-generator/0.2.0
[INFO] validating manifest of merkle-generator-0.2.0 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 merkle-generator-0.2.0 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 merkle-generator-0.2.0
[INFO] finished frobbing merkle-generator-0.2.0
[INFO] frobbed toml for merkle-generator-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/merkle-generator/0.2.0/Cargo.toml
[INFO] started frobbing merkle-generator-0.2.0
[INFO] finished frobbing merkle-generator-0.2.0
[INFO] frobbed toml for merkle-generator-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/merkle-generator/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.9.4"`
[INFO] [stderr]   candidate versions found which didn't match: 0.16.7, 0.16.6, 0.16.5, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `merkle-generator v0.2.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/merkle-generator/0.2.0)`
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:yanked
[ERROR] caused by: crate merkle-generator-0.2.0 depends on yanked crates
[ERROR]