[INFO] crate unbound 0.3.0 is already in cache
[INFO] extracting crate unbound 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/unbound/0.3.0
[INFO] extracting crate unbound 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/unbound/0.3.0
[INFO] validating manifest of unbound-0.3.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of unbound-0.3.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing unbound-0.3.0
[INFO] removed path dependency unbound-sys from unbound-0.3.0
[INFO] finished frobbing unbound-0.3.0
[INFO] frobbed toml for unbound-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/unbound/0.3.0/Cargo.toml
[INFO] started frobbing unbound-0.3.0
[INFO] removed path dependency unbound-sys from unbound-0.3.0
[INFO] finished frobbing unbound-0.3.0
[INFO] frobbed toml for unbound-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/unbound/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr] error: no matching package named `libbindgen` found
[INFO] [stderr] location searched: registry `https://github.com/rust-lang/crates.io-index`
[INFO] [stderr] required by package `unbound-sys v0.3.0`
[INFO] [stderr]     ... which is depended on by `unbound v0.3.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/unbound/0.3.0)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed