Input of example

I saw the new line expression was set in  "Calculator Example"
But when I use ```parser$parse(input = "a=2+3 \n b=a/2 ",lexer = lexer)```
It seems not work .
And I also try
```
 parser$parse(input = "a=2+3 
                       b=a/2 ",lexer = lexer)
```
It seems not work either.