Use `&&` and `||` for logic, synonyms for `andalso` and `orelse`

```haskell
verify_int (Int, Max) =
    false || verify_strict_int(Int) && verify_strict_int(Max) && Int =< Max
```
![antlr4_parse_tree](https://cloud.githubusercontent.com/assets/278727/2623583/f7664c46-bcf9-11e3-9c26-347b53365ab4.png)