[INFO] crate monotone 0.4.0 is already in cache
[INFO] extracting crate monotone 0.4.0 into work/ex/clippy-test-run/sources/stable/reg/monotone/0.4.0
[INFO] extracting crate monotone 0.4.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/monotone/0.4.0
[INFO] validating manifest of monotone-0.4.0 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of monotone-0.4.0 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing monotone-0.4.0
[INFO] finished frobbing monotone-0.4.0
[INFO] frobbed toml for monotone-0.4.0 written to work/ex/clippy-test-run/sources/stable/reg/monotone/0.4.0/Cargo.toml
[INFO] started frobbing monotone-0.4.0
[INFO] finished frobbing monotone-0.4.0
[INFO] frobbed toml for monotone-0.4.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/monotone/0.4.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.6"`
[INFO] [stderr]   candidate versions found which didn't match: 0.14.3, 0.14.2, 0.14.1, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `rusoto v0.23.0`
[INFO] [stderr]     ... which is depended on by `monotone v0.4.0 (/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/monotone/0.4.0)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed