[INFO] crate mix_link 0.0.4 is already in cache
[INFO] extracting crate mix_link 0.0.4 into work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mix_link/0.0.4
[INFO] extracting crate mix_link 0.0.4 into work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/reg/mix_link/0.0.4
[INFO] validating manifest of mix_link-0.0.4 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 mix_link-0.0.4 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 mix_link-0.0.4
[INFO] finished frobbing mix_link-0.0.4
[INFO] frobbed toml for mix_link-0.0.4 written to work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mix_link/0.0.4/Cargo.toml
[INFO] started frobbing mix_link-0.0.4
[INFO] finished frobbing mix_link-0.0.4
[INFO] frobbed toml for mix_link-0.0.4 written to work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/reg/mix_link/0.0.4/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 `curve25519-dalek = "^0.18"`
[INFO] [stderr]   candidate versions found which didn't match: 1.0.1, 0.21.0, 0.20.0, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `x25519-dalek v0.2.1`
[INFO] [stderr]     ... which is depended on by `ecdh_wrapper v0.0.7`
[INFO] [stderr]     ... which is depended on by `mix_link v0.0.4 (/mnt/big/crater/work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/reg/mix_link/0.0.4)`
[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