@Test public void testUnescaped$InAction() throws Exception {
		String action = "\\$string$";
		String expected = "$string$";
		testActions(attributeTemplate, "members", action, expected);
		testActions(attributeTemplate, "init", action, expected);
		testActions(attributeTemplate, "inline", action, expected);
		testActions(attributeTemplate, "finally", action, expected);
		testActions(attributeTemplate, "inline2", action, expected);
	}
Regression test for "in antlr v4 lexer, $ translation issue in action".
https://github.com/antlr/antlr4/issues/176
tool-testsuite/test/org/antlr/v4/test/tool/TestActionTranslation.java