<prog>
  <l_dec>
    <varDec>$a</varDec>
  </l_dec>
  <l_dec>
    <foncDec>
      main
      <l_instr>
        <instr_si>
          <intExp>0</intExp>
          <l_instr>
            <instr_ecrire>
              <intExp>1</intExp>
            </instr_ecrire>
          </l_instr>
          <l_instr>
            <instr_ecrire>
              <intExp>0</intExp>
            </instr_ecrire>
          </l_instr>
        </instr_si>
      </l_instr>
    </foncDec>
  </l_dec>
</prog>
