Re: [PATCH 3/3] parse-opt: migrate builtin-merge-file.

diff --git a/builtin-merge-file.c b/builtin-merge-file.c
index 45c9853..7736fe8 100644
--- a/builtin-merge-file.c
+++ b/builtin-merge-file.c

@@ -2,21 +2,44 @@

+static int label_cb(const struct option *opt, const char *arg, int unset)
+{
+	static int label_count = 0;
+	const char **names = (const char **)opt->value;
+
+	if (label_count >= 3)
+		return error("too many labels on the command like");