[INFO] updating cached repository KurozeroPB/Nobu
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/KurozeroPB/Nobu
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/KurozeroPB/Nobu" "work/ex/pr-62181/sources/master#6ea4036cd20a4b1ab1d56e555108c21735ff6946/gh/KurozeroPB/Nobu"`
[INFO] [stderr] Cloning into 'work/ex/pr-62181/sources/master#6ea4036cd20a4b1ab1d56e555108c21735ff6946/gh/KurozeroPB/Nobu'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/KurozeroPB/Nobu" "work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/gh/KurozeroPB/Nobu"`
[INFO] [stderr] Cloning into 'work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/gh/KurozeroPB/Nobu'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 06c5e3cba266ebe5710f97120a28fb07490708ef
[INFO] sha for GitHub repo KurozeroPB/Nobu: 06c5e3cba266ebe5710f97120a28fb07490708ef
[INFO] validating manifest of KurozeroPB/Nobu on toolchain master#6ea4036cd20a4b1ab1d56e555108c21735ff6946
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of KurozeroPB/Nobu on toolchain try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+003a7b6b5753e8509fdfe7949d4f0873ba71e4fc-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing KurozeroPB/Nobu
[INFO] finished frobbing KurozeroPB/Nobu
[INFO] frobbed toml for KurozeroPB/Nobu written to work/ex/pr-62181/sources/master#6ea4036cd20a4b1ab1d56e555108c21735ff6946/gh/KurozeroPB/Nobu/Cargo.toml
[INFO] started frobbing KurozeroPB/Nobu
[INFO] finished frobbing KurozeroPB/Nobu
[INFO] frobbed toml for KurozeroPB/Nobu written to work/ex/pr-62181/sources/try#003a7b6b5753e8509fdfe7949d4f0873ba71e4fc/gh/KurozeroPB/Nobu/Cargo.toml
[INFO] crate KurozeroPB/Nobu already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating git repository `https://github.com/zeyla/serenity`
[INFO] [stderr] error: failed to load source for a dependency on `serenity`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   Unable to update https://github.com/zeyla/serenity?branch=v0.6.x#a0895d36
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   revspec 'a0895d367f17880d593613069638a7c890ec5a27' not found; class=Reference (4); code=NotFound (-3)
[ERROR] this task or one of its parent failed!
[ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ea4036cd20a4b1ab1d56e555108c21735ff6946-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` failed