@Test public void testArgOnPrimaryRuleInLeftRecursiveRule() throws Exception {
		String grammar =
			"grammar T;\n" +
			"val: dval[1]\n" +
			"   | val '*' val\n" +
			"   ;\n" +
			"dval[int  x]: '.';\n";
		String expected = ""; // dval[1] should not be error
		testErrors(new String[]{grammar, expected}, false);
	}
Reproduces https://github.com/antlr/antlr4/issues/773
tool-testsuite/test/org/antlr/v4/test/tool/TestLeftRecursionToolIssues.java