[INFO] updating cached repository tene/merlin-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tene/merlin-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tene/merlin-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/tene/merlin-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/tene/merlin-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tene/merlin-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tene/merlin-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tene/merlin-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 982a032db2de8f65dbd237bf604de4aa5d1b7c81
[INFO] sha for GitHub repo tene/merlin-rs: 982a032db2de8f65dbd237bf604de4aa5d1b7c81
[INFO] validating manifest of tene/merlin-rs 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 tene/merlin-rs 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 tene/merlin-rs
[INFO] removed path dependency rocket from tene/merlin-rs
[INFO] removed path dependency rocket-simpleauth from tene/merlin-rs
[INFO] removed path dependency rocket_codegen from tene/merlin-rs
[INFO] removed path dependency rocket_contrib from tene/merlin-rs
[INFO] finished frobbing tene/merlin-rs
[INFO] frobbed toml for tene/merlin-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/tene/merlin-rs/Cargo.toml
[INFO] started frobbing tene/merlin-rs
[INFO] removed path dependency rocket from tene/merlin-rs
[INFO] removed path dependency rocket-simpleauth from tene/merlin-rs
[INFO] removed path dependency rocket_codegen from tene/merlin-rs
[INFO] removed path dependency rocket_contrib from tene/merlin-rs
[INFO] finished frobbing tene/merlin-rs
[INFO] frobbed toml for tene/merlin-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tene/merlin-rs/Cargo.toml
[INFO] crate tene/merlin-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: failed to select a version for the requirement `ring = "^0.11.0"`
[INFO] [stderr]   candidate versions found which didn't match: 0.16.7, 0.16.6, 0.16.5, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `cookie v0.9.1`
[INFO] [stderr]     ... which is depended on by `rocket v0.3.0`
[INFO] [stderr]     ... which is depended on by `rocket-simpleauth v0.4.0`
[INFO] [stderr]     ... which is depended on by `merlin v0.1.0 (/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/tene/merlin-rs)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed