Can't assign expression to array of processes

Consider the following scenario:

`module A{listen nil}{read nrofprocs:int}
{
	for (int i = 0; i < nrofprocs; ++i) {
		tasks@[i].rank = i + 1;
	}
}{speak nil}{write nrprocs: int ; ((rank: int) tasks[];) }`

after this instruction, tasks[i] will have the value "i" instead of "i + 1".
Also adding parantheses `tasks@[i].rank = (i + 1);` will result in compilation error.