[INFO] crate merkle-rs 0.0.1 is already in cache
[INFO] extracting crate merkle-rs 0.0.1 into work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/reg/merkle-rs/0.0.1
[INFO] extracting crate merkle-rs 0.0.1 into work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/reg/merkle-rs/0.0.1
[INFO] validating manifest of merkle-rs-0.0.1 on toolchain master#e2f221c75932de7a29845c8d6f1f73536ad00c41
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of merkle-rs-0.0.1 on toolchain try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0bfb90d213a93e466b33d078a5b535a2a6f9c5ff-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing merkle-rs-0.0.1
[INFO] finished frobbing merkle-rs-0.0.1
[INFO] frobbed toml for merkle-rs-0.0.1 written to work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/reg/merkle-rs/0.0.1/Cargo.toml
[INFO] started frobbing merkle-rs-0.0.1
[INFO] finished frobbing merkle-rs-0.0.1
[INFO] frobbed toml for merkle-rs-0.0.1 written to work/ex/pr-57617/sources/try#0bfb90d213a93e466b33d078a5b535a2a6f9c5ff/reg/merkle-rs/0.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.12.1"`
[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-rs v0.0.1 (/mnt/big/crater/work/ex/pr-57617/sources/master#e2f221c75932de7a29845c8d6f1f73536ad00c41/reg/merkle-rs/0.0.1)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e2f221c75932de7a29845c8d6f1f73536ad00c41-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed