+# has_remote BRANCH
+# Whether BRANCH has a remote equivalent (accepts top-bases/ too)
+has_remote()
+{
+ [ -n "$base_remote" ] && ref_exists "remotes/$base_remote/$1"
+}
+
+branch_annihilated()
+{
+ _name="$1";
+
+ # use the merge base in case the base is ahead.
+ mb="$(git merge-base "refs/top-bases/$_name" "$_name")";
+
+ test "$(git rev-parse "$mb^{tree}")" = "$(git rev-parse "$_name^{tree}")";
+}
+