[INFO] crate dalek-rangeproofs 0.1.0 is already in cache
[INFO] extracting crate dalek-rangeproofs 0.1.0 into work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/reg/dalek-rangeproofs/0.1.0
[INFO] extracting crate dalek-rangeproofs 0.1.0 into work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/reg/dalek-rangeproofs/0.1.0
[INFO] validating manifest of dalek-rangeproofs-0.1.0 on toolchain master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dalek-rangeproofs-0.1.0 on toolchain try#bad365140e1e8233b42b21af70a407f14ce5fec5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dalek-rangeproofs-0.1.0
[INFO] finished frobbing dalek-rangeproofs-0.1.0
[INFO] frobbed toml for dalek-rangeproofs-0.1.0 written to work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/reg/dalek-rangeproofs/0.1.0/Cargo.toml
[INFO] started frobbing dalek-rangeproofs-0.1.0
[INFO] finished frobbing dalek-rangeproofs-0.1.0
[INFO] frobbed toml for dalek-rangeproofs-0.1.0 written to work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/reg/dalek-rangeproofs/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `curve25519-dalek = "^0.8"`
[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 `dalek-rangeproofs v0.1.0 (/mnt/big/crater/work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/reg/dalek-rangeproofs/0.1.0)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed