[INFO] crate kyber 0.2.0-alpha.2 is already in cache
[INFO] extracting crate kyber 0.2.0-alpha.2 into work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/kyber/0.2.0-alpha.2
[INFO] extracting crate kyber 0.2.0-alpha.2 into work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/kyber/0.2.0-alpha.2
[INFO] validating manifest of kyber-0.2.0-alpha.2 on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kyber-0.2.0-alpha.2 on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kyber-0.2.0-alpha.2
[INFO] finished frobbing kyber-0.2.0-alpha.2
[INFO] frobbed toml for kyber-0.2.0-alpha.2 written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/kyber/0.2.0-alpha.2/Cargo.toml
[INFO] started frobbing kyber-0.2.0-alpha.2
[INFO] finished frobbing kyber-0.2.0-alpha.2
[INFO] frobbed toml for kyber-0.2.0-alpha.2 written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/reg/kyber/0.2.0-alpha.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `subtle = "^0.6"`
[INFO] [stderr]   candidate versions found which didn't match: 2.0.0, 1.0.0
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `kyber v0.2.0-alpha.2 (/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/reg/kyber/0.2.0-alpha.2)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed