Re: [PATCH 5/5] diff: properly error out when combining multiple pickaxe options

Stefan Beller [off-list ref] writes:

;

+	count = 0;
+
+	if (options->pickaxe_opts & DIFF_PICKAXE_KIND_S)
+		count++;
+	if (options->pickaxe_opts & DIFF_PICKAXE_KIND_G)
+		count++;
+	if (options->pickaxe_opts & DIFF_PICKAXE_KIND_OBJFIND)
+		count++;
+	if (count > 1)
+		die(_("-G, -S, --find-object are mutually exclusive"));

I thought the reason you defined pickaxe-kind bitmask was so that
you can mask this field to grab these (and only these) bits.
Once you have that mask, you should be able to use HAS_MULTI_BITS()
on the masked result without counting, no?