DSL EXPRESSION:
++1


AST:
"block" [tt:block] [nt:StatementBlock]
    "+" [tt:op_plus] [nt:BareBoolean]
        "+" [tt:op_plus] [nt:Operator]
            "+" [tt:op_plus] [nt:Operator]
                "1" [tt:int_literal] [nt:int_literal]

