From 1278ff899409025692d6915421f1af1c99dc837e Mon Sep 17 00:00:00 2001
From: Joshua Haberman <jhaberman@gmail.com>
Date: Tue, 11 Jul 2017 14:11:54 -0500
Subject: Responded to PR comments.

---
 tools/upbc.lua | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'tools/upbc.lua')

diff --git a/tools/upbc.lua b/tools/upbc.lua
index bf9a68d..bfd93f8 100644
--- a/tools/upbc.lua
+++ b/tools/upbc.lua
@@ -18,6 +18,10 @@ for _, argument in ipairs(arg) do
   if argument == "--generate-upbdefs" then
     generate_upbdefs = true
   else
+    if src then
+      print("upbc can only handle one input file at a time.")
+      return 1
+    end
     src = argument
   end
 end
-- 
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