@safe:

void main()
{
	auto arr = new int[](5);
	int* p;
	foreach (i, ref n; arr)
	{
		p = &arr[i]; // OK
		p = &n; // not OK
	}
}

DMD 2.111.0 says:

test.d(10): Error: taking the address of stack-allocated local variable `n` is not allowed in a `@safe` function
        p = &n; // not OK
             ^

However, n is not stack-allocated, it is on the GC heap.

Probably related: #18267
(However, the wording of the error has regressed further in the latest version.)