module: Main
    function: main
        parameter:
        return_type: int
        body:
           declare n1: int =1
           declare n2: int =2
           declare n3: int =1
           if n1 ==1 then
              if n2 ==2 then
              n3 =3
              end if
           end if
        return n3
        end body
    end function
end module