[INFO] crate mpw-rs 2.4.3 is already in cache
[INFO] extracting crate mpw-rs 2.4.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/mpw-rs/2.4.3
[INFO] extracting crate mpw-rs 2.4.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mpw-rs/2.4.3
[INFO] validating manifest of mpw-rs-2.4.3 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mpw-rs-2.4.3 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mpw-rs-2.4.3
[INFO] finished frobbing mpw-rs-2.4.3
[INFO] frobbed toml for mpw-rs-2.4.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/mpw-rs/2.4.3/Cargo.toml
[INFO] started frobbing mpw-rs-2.4.3
[INFO] finished frobbing mpw-rs-2.4.3
[INFO] frobbed toml for mpw-rs-2.4.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mpw-rs/2.4.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.11"`
[INFO] [stderr]   candidate versions found which didn't match: 0.16.5, 0.16.4, 0.16.3, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `mpw-rs v2.4.3 (/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/mpw-rs/2.4.3)`
[ERROR] this task or one of its parent failed!
[ERROR] overridden task result to broken:yanked
[ERROR] caused by: crate mpw-rs-2.4.3 depends on yanked crates
[ERROR]