Fix nested references to 'ref' foreach variables. These "walk around" the array being iterated over, so they're a bit trickier than other variables to get right.

module moduleinfo1;

static this()
{
}

static this()
{
}

static ~this()
{
}

static ~this()
{
}

unittest
{
}

class C
{
}

class D : C
{
}

void main()
{
}