[INFO] updating cached repository sinmaplewing/RustGuestbook
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sinmaplewing/RustGuestbook
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sinmaplewing/RustGuestbook" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/sinmaplewing/RustGuestbook"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/sinmaplewing/RustGuestbook'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sinmaplewing/RustGuestbook" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/sinmaplewing/RustGuestbook"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/sinmaplewing/RustGuestbook'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7ef830a19d73e34776f1a0d2b7ed963fcb580f8a
[INFO] sha for GitHub repo sinmaplewing/RustGuestbook: 7ef830a19d73e34776f1a0d2b7ed963fcb580f8a
[INFO] validating manifest of sinmaplewing/RustGuestbook on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of sinmaplewing/RustGuestbook on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing sinmaplewing/RustGuestbook
[INFO] finished frobbing sinmaplewing/RustGuestbook
[INFO] frobbed toml for sinmaplewing/RustGuestbook written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/sinmaplewing/RustGuestbook/Cargo.toml
[INFO] started frobbing sinmaplewing/RustGuestbook
[INFO] finished frobbing sinmaplewing/RustGuestbook
[INFO] frobbed toml for sinmaplewing/RustGuestbook written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/sinmaplewing/RustGuestbook/Cargo.toml
[INFO] crate sinmaplewing/RustGuestbook has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "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: 0.14.3, 0.14.2, 0.14.1, ...
[INFO] [stderr]   location searched: crates.io index
[INFO] [stderr] required by package `cookie v0.9.1`
[INFO] [stderr]     ... which is depended on by `rocket v0.3.9`
[INFO] [stderr]     ... which is depended on by `RustGuestbook v0.1.0 (/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/sinmaplewing/RustGuestbook)`
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed