Handle missing input file.

diff --git a/src/ofc/OFC.scala b/src/ofc/OFC.scala
index 9653e709df620efa743311598145364fecc61d79..5289ecd5e270a5cc065727362a7bbfc9fed311fa 100644 (file)
--- a/src/ofc/OFC.scala
+++ b/src/ofc/OFC.scala
@@ -5,7 +5,10 @@ import parser.{Parser,Statement,ParseException}
 object OFC extends Parser {
 
   def main(args: Array[String]) {
-    if (args.isEmpty) throw new IllegalArgumentException("Unspecified input file.")
+    if (args.isEmpty) {
+      Console.err.println("Specify input file.")
+      System.exit(1)
+    }
 
     val reader = new FileReader(args(0))