Report file names with lexer errors

tool/test/org/antlr/v4/test/TestPerformance.java

@@ -1094,6 +1094,9 @@ public class TestPerformance extends BaseTest {
 							sharedLexers[thread] = lexer;
                         }
 
+						lexer.removeErrorListeners();
+						lexer.addErrorListener(DescriptiveErrorListener.INSTANCE);
+
 						if (lexer.getInterpreter().decisionToDFA[0] == null) {
 							ATN atn = lexer.getATN();
 							for (int i = 0; i < lexer.getInterpreter().decisionToDFA.length; i++) {