code: def p_ind8_I(p):
      
      expr = p[4]
      if p[3] == '-':
          expr = Expr.makenode(Container('-', p.lineno(3)), expr)
  
      p[0] = ('(%s+N)' % p[2], expr)
docs: reg8_I : LP IX PLUS expr RP
                 | LP IX MINUS expr RP
                 | LP IY PLUS expr RP
                 | LP IY MINUS expr RP
                 | LP IX PLUS pexpr RP
                 | LP IX MINUS pexpr RP
                 | LP IY PLUS pexpr RP
                 | LP IY MINUS pexpr RP