Understanding nested function reference in parfor loop

I came accross this sentence in MATLAB doc:

The body of a parfor-loop cannot make reference to a nested function. However, it can call a nested function by means of a function handle.

Can someone please explain what this means?

[Jason Stockton]

Yes, Please. I am having an issue with it now. Thanks.

[Jonathan Chin]

Look at this examples where I am creating a function handle for my nested function.

function out=parforTest(in)
 out = zeros(1,4);
 tmp=@(x)nestedFunc(in,x);
 parfor ii=1:4
    out(ii)=feval(tmp,ii)
 end
 function outv= nestedFunc(in,var)
        outv = in+var;
    end
end