[INFO] fetching crate keen 1.4.1...
[INFO] extracting crate keen 1.4.1 into work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/keen/1.4.1
[INFO] extracting crate keen 1.4.1 into work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/reg/keen/1.4.1
[INFO] validating manifest of keen-1.4.1 on toolchain master#c0086b9e8972fef9fd4af24bae20d45021ed06c6
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of keen-1.4.1 on toolchain try#290ac7b29f41ff9fa5232f9a1116ea71a3501063
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+290ac7b29f41ff9fa5232f9a1116ea71a3501063-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing keen-1.4.1
[INFO] finished frobbing keen-1.4.1
[INFO] frobbed toml for keen-1.4.1 written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/keen/1.4.1/Cargo.toml
[INFO] started frobbing keen-1.4.1
[INFO] finished frobbing keen-1.4.1
[INFO] frobbed toml for keen-1.4.1 written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/reg/keen/1.4.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `webpki = "^0.8.0"`
[INFO] [stderr]   candidate versions found which didn't match: 0.19.1, 0.19.0, 0.18.1
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `webpki-roots v0.6.0`
[INFO] [stderr]     ... which is depended on by `hyper-rustls v0.3.0`
[INFO] [stderr]     ... which is depended on by `keen v1.4.1 (/mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/keen/1.4.1)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c0086b9e8972fef9fd4af24bae20d45021ed06c6-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed