Help needed dynamically writing to local variables

Hi folks

I am using a numeric limit test

The test is within a loop, and the current iteration is stored in a local variable

I am entering an expression in the Post-Expression field, and need to achieve the following:

If step fails, variable[iteration.local].local = Fail

So for example:

If step fails, variable1.local = Fail

This allows me to identify in which iteration the failure occurred, so I can record the result against the correct DUT in the batch that is looping.

Can someone tell me the required syntax to achieve the statement?

Thanks!