[INFO] fetching crate tls-api-test 0.1.20...
[INFO] extracting crate tls-api-test 0.1.20 into work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/tls-api-test/0.1.20
[INFO] extracting crate tls-api-test 0.1.20 into work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/reg/tls-api-test/0.1.20
[INFO] validating manifest of tls-api-test-0.1.20 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 tls-api-test-0.1.20 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 tls-api-test-0.1.20
[INFO] finished frobbing tls-api-test-0.1.20
[INFO] frobbed toml for tls-api-test-0.1.20 written to work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/tls-api-test/0.1.20/Cargo.toml
[INFO] started frobbing tls-api-test-0.1.20
[INFO] finished frobbing tls-api-test-0.1.20
[INFO] frobbed toml for tls-api-test-0.1.20 written to work/ex/pr-58899/sources/try#290ac7b29f41ff9fa5232f9a1116ea71a3501063/reg/tls-api-test/0.1.20/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 = "^0.17"`
[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 `tls-api-test v0.1.20 (/mnt/big/crater/work/ex/pr-58899/sources/master#c0086b9e8972fef9fd4af24bae20d45021ed06c6/reg/tls-api-test/0.1.20)`
[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