[INFO] crate mozilla-ca-certs 0.1.3 is already in cache
[INFO] extracting crate mozilla-ca-certs 0.1.3 into work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mozilla-ca-certs/0.1.3
[INFO] extracting crate mozilla-ca-certs 0.1.3 into work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/reg/mozilla-ca-certs/0.1.3
[INFO] validating manifest of mozilla-ca-certs-0.1.3 on toolchain master#6ecad338381cc3b8d56e2df22e5971a598eddd6c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mozilla-ca-certs-0.1.3 on toolchain try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f789154f114767b2d0cb9c5b6c592cb3a635e6f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mozilla-ca-certs-0.1.3
[INFO] finished frobbing mozilla-ca-certs-0.1.3
[INFO] frobbed toml for mozilla-ca-certs-0.1.3 written to work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mozilla-ca-certs/0.1.3/Cargo.toml
[INFO] started frobbing mozilla-ca-certs-0.1.3
[INFO] finished frobbing mozilla-ca-certs-0.1.3
[INFO] frobbed toml for mozilla-ca-certs-0.1.3 written to work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/reg/mozilla-ca-certs/0.1.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `webpki = "^0.3.0"`
[INFO] [stderr]   candidate versions found which didn't match: 0.19.0, 0.18.1
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `mozilla-ca-certs v0.1.3 (/mnt/big/crater/work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mozilla-ca-certs/0.1.3)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed