@Test public void testLeftRecursiveStartRule() throws Exception {
		LexerGrammar lg = new LexerGrammar(
			"lexer grammar L;\n" +
			"A : 'a' ;\n" +
			"B : 'b' ;\n" +
			"C : 'c' ;\n" +
			"PLUS : '+' ;\n" +
			"MULT : '*' ;\n");
		Grammar g = new Grammar(
			"parser grammar T;\n" +
			"s : e ;\n" +
			"e : e MULT e\n" +
			"  | e PLUS e\n" +
			"  | A\n" +
			"  ;\n",
			lg);

		testInterp(lg, g, "e", "a", 	"(e a)");
		testInterp(lg, g, "e", "a+a", 	"(e (e a) + (e a))");
		testInterp(lg, g, "e", "a*a", 	"(e (e a) * (e a))");
		testInterp(lg, g, "e", "a+a+a", "(e (e (e a) + (e a)) + (e a))");
		testInterp(lg, g, "e", "a*a+a", "(e (e (e a) * (e a)) + (e a))");
		testInterp(lg, g, "e", "a+a*a", "(e (e a) + (e (e a) * (e a)))");
	}
This is a regression test for antlr/antlr4#461.
https://github.com/antlr/antlr4/issues/461
tool-testsuite/test/org/antlr/v4/test/tool/TestParserInterpreter.java