From bb18e14e04a72da5c244c9d11e5ac9df2067876c Mon Sep 17 00:00:00 2001
From: Sam Harwell <sam@tunnelvisionlabs.com>
Date: Fri, 12 Apr 2013 13:20:10 -0500
Subject: [PATCH] Throw UnsupportedOperationException in not implemented method

---
 tool/src/org/antlr/v4/tool/interp/ParserInterpreter.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tool/src/org/antlr/v4/tool/interp/ParserInterpreter.java b/tool/src/org/antlr/v4/tool/interp/ParserInterpreter.java
index 7221a0f83..a118f4a99 100644
--- a/tool/src/org/antlr/v4/tool/interp/ParserInterpreter.java
+++ b/tool/src/org/antlr/v4/tool/interp/ParserInterpreter.java
@@ -64,7 +64,7 @@ public class ParserInterpreter {
 
 		@Override
 		public String getGrammarFileName() {
-			return null;
+			throw new UnsupportedOperationException("not implemented");
 		}
 
 		@Override