@Test public void testEmptyActions() throws Exception {
	    String gS =
	   		"grammar A;\n"+
	   		"a[] : 'a' ;\n" +
	   		"c : a[] c[] ;\n";
	    Grammar g = new Grammar(gS);
    }
Regression test for issue #1295
$e.v yields incorrect value 0 in "e returns [int v] : '1' {$v = 1;} | '(' e ')' {$v = $e.v;} ;"
https://github.com/antlr/antlr4/issues/1295
tool-testsuite/test/org/antlr/v4/test/tool/TestActionTranslation.java