// Identifier i;
 // Exp e1,e2;
 public Object visit(ArrayAssign n) { // Implementado
   n.i.accept(this);
   String tipo = typeOf(n.i.s, n.getLine_number());
   Object exp1 = n.e1.accept(this);
   Object exp2 = n.e2.accept(this);
   if ((exp1 instanceof String) && (exp2 instanceof String) && (tipo != null)) {
     String ep1 = (String) exp1;
     String ep2 = (String) exp2;
     boolean valida =
         ep1.equalsIgnoreCase("IntegerType")
             && tipo.equalsIgnoreCase("IntArrayType")
             && ep2.equalsIgnoreCase("IntegerType");
     if (valida) return "IntegerType";
     else {
       error.add("Atribuicao invalida! Tipos incompativeis! Linha: " + n.getLine_number());
     }
   }
   return null;
 }
 @Override
 public void visit(ArrayAssign arrayAssignStm) {
   if (arrayAssignStm.getId() != null) arrayAssignStm.getId().accept(this);
   System.out.print("[");
   if (arrayAssignStm.getIndex() != null) arrayAssignStm.getIndex().accept(this);
   System.out.print("] = ");
   if (arrayAssignStm.getValue() != null) arrayAssignStm.getValue().accept(this);
   System.out.print(";");
 }