[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-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/reg/mozilla-ca-certs/0.1.3
[INFO] extracting crate mozilla-ca-certs 0.1.3 into work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/mozilla-ca-certs/0.1.3
[INFO] validating manifest of mozilla-ca-certs-0.1.3 on toolchain master#d99a320cba42f661aebfa1293b7b2ec3603dda75
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mozilla-ca-certs-0.1.3 on toolchain try#e70472fc501b855c9080f3772432c10fe20b8866
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-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-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/mozilla-ca-certs/0.1.3/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-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: 0.18.1, 0.18.0, 0.17.0, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `mozilla-ca-certs v0.1.3 (/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed