public void FunctionSlice(string expression, string expected)
 {
     BuiltinFunctionsTester.AssertEqual(expression, expected);
 }
 public void FunctionToken(string expression, string expected)
 {
     BuiltinFunctionsTester.AssertPrint(expression, expected);
 }
 public void FunctionType(string template, string expected)
 {
     BuiltinFunctionsTester.AssertPrint(template, expected);
 }