[INFO] crate merkle-generator 0.2.0 is already in cache
[INFO] extracting crate merkle-generator 0.2.0 into work/ex/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/reg/merkle-generator/0.2.0
[INFO] extracting crate merkle-generator 0.2.0 into work/ex/pr-57609/sources/try#26f8d250bb3c8a85e812cf663c730ef9e0df9315/reg/merkle-generator/0.2.0
[INFO] validating manifest of merkle-generator-0.2.0 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 merkle-generator-0.2.0 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 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/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/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/pr-57609/sources/try#26f8d250bb3c8a85e812cf663c730ef9e0df9315/reg/merkle-generator/0.2.0/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 `ring = "^0.9.4"`
[INFO] [stderr]   candidate versions found which didn't match: 0.14.1, 0.14.0, 0.13.5, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `merkle-generator v0.2.0 (/mnt/big/crater/work/ex/pr-57609/sources/master#03acbd71c977cd63ce5f39ba9b6fe9ffd578785a/reg/merkle-generator/0.2.0)`
[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