git-rev-list diff options broken

Hi,

the git-rev-list manpage says

** Diff Formatting ~~~~~~~~~~~~~~~

Below are listed options that control the formatting of diff output. Some of them are specific to gitlink:git-rev-list[1], however other diff options may be given. See gitlink:git-diff-files[1] for more options. **

however, the source code says

	if ((!list &&
	     (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
	      !revs.pending.nr)) ||
	    revs.diff)
		usage(rev_list_usage);

so any attempt at showing diffs with git-rev-list will fail. What's the deal with this?