git-update-index -z --index-info <"$dotest/patch-merge-index-info" &&
GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \
git-write-tree >"$dotest/patch-merge-base+" ||
- cannot_fallback "Patch does not record usable index information."
+ cannot_fallback "Repository lacks necessary blobs to fall back on 3-way merge."
echo Using index info to reconstruct a base tree...
if GIT_INDEX_FILE="$dotest/patch-merge-tmp-index" \